Coastal Wave Network Annual Report Tr 19

Southeast and Southwest Strategic Regional Coastal Monitoring Programmes

COASTAL WAVE NETWORK

ANNUAL REPORT

2007

TR 19 01 April 2008 Annual Wave Report 2007

Channel Coastal Observatory National Oceanography Centre European Way Southampton SO14 3ZH

Tel: +44 (0)23 8059 8467 Fax: +44 (0)2380 596320 e-mail: [email protected] Web site: www.channelcoast.org

Document Title: Coastal Wave Network Annual Report 2007

Reference: TR 19

Status: Final

Date: 1 April 2008

Project Name: Southeast and Southwest Strategic Regional Coastal Monitoring Programmes

Authors: T. Mason & T. Poate

Approved By: A. P. Bradbury

Cover photograph by kind permission of EMU Limited

Directional Waverider Mk III at West Bay, May 2007

Strategic Regional Coastal Monitoring Programmes of England Coastal Wave Network Annual Report 2007

Contents

1. Introduction...... 2

2. Locations ...... 2

3. Instrumentation and data transfer ...... 3

4. Data recovery rates ...... 4

5. Quality Control Procedures...... 5

6. Data availability...... 5

7. Site Reports...... 5

Herne Bay ...... 6 Deal Pier...... 13 Folkestone...... 20 Pevensey Bay ...... 28 Rustington ...... 36 Hayling Island...... 44 Sandown Bay ...... 52 Sandown Pier...... 60 Milford-on-Sea...... 67 Boscombe ...... 75 Swanage Pier...... 83 Weymouth ...... 90 Chesil ...... 98 West Bay...... 106 Start Bay...... 113 Penzance ...... 120 Perranporth ...... 127 Minehead...... 134

1 Annual Wave Report 2007

1. Introduction

The Strategic Regional Coastal Monitoring Programmes of England have developed a coastal wave network which concentrates on measurements in shallow water where, traditionally, there are very few long-term wave data and where the wave transformation models are generally least reliable. The principle aims of the coastal wave network are to:

• generate characteristic nearshore wave climates for design of coastal defences • validate numerical wave transformation models, notably in areas of irregular bathymetry • evaluate the performance of existing beach management schemes

A further aim has been to make the measured wave parameters freely and easily available to other users, both in real-time and as quality-controlled archive data.

This annual report contains the results of the statistical analysis of quality-controlled data for 2007.

2. Locations

The location of the wave measuring sites is shown in Figure 1, with further details in Table 1. The wave buoys are deployed in approximately 10-12m CD water depth There are also four inshore installations, measuring waves in less than 5m water depth.

Figure 1 Location of wave measuring sites

Approx. Water First Key Site Instrument type Distance depth deployed offshore (km) A Herne Bay Step gauge 0.5m 1 1996 B Deal Pier WaveRadar Rex - - 2005 C Folkestone Directional waverider 12.7 CD 1.5 2003 D Pevensey Bay Directional waverider 9.8 CD 5 2003 E Rustington Directional waverider 9.9 CD 8 2003 F Hayling Island Directional waverider 10.2 CD 7.5 2003 G Sandown Bay Directional waverider 10.7 CD 1.5 2003 H Sandown Pier WaveRadar Rex - - 2006 I Milford-on-Sea Directional waverider 10.0 CD 1.6 1996

2 Annual Wave Report 2007

Approx. Water First Key Site Instrument type Distance depth deployed offshore (km) J Boscombe Directional waverider 10.4 CD 1 2003 K Swanage Pier WaveRadar Rex - - 2007 L Weymouth Directional waverider ~10 CD 1.6 2006 M Chesil Directional waverider ~10 CD 0.5 2006 N West Bay Directional waverider ~10 CD 1.3 2006 O Start Bay Directional waverider ~10 CD 1.6 2007 P Penzance Directional waverider 10.4 CD 1.6 2007 Q Perranporth Directional waverider ~10 CD 1.2 2006 R Minehead Directional waverider ~10 CD 1.3 2006

Table 1 Instrument type and location

3. Instrumentation and data transfer a. Directional wave buoys

The wave buoys in the Coastal Wave Network are Directional Waveriders (DWR) Mk III, manufactured by Datawell (Figure 2). They are moored using Datawell’s shallow water mooring, which consists of 2 x 15m bungees buoyed at each section. GPS positions are received by a top-mounted antenna.

Sampling rate on the buoy is 3.84Hz. Data are then filtered and down- sampled to 1.28Hz for transmission to the shore station by HF radio link. Figure 2 Wave parameters are calculated Directional Waverider Mk III prior to from the data received at the shore deployment at Minehead (above); station and are derived over a 30 and deployed off West Bay (right). minute sampling period, every 30 Photos courtesy of EMU Ltd) minutes.

Processed parameters and directional spectra are transferred from the shore station in near real-time to the Channel Coastal Observatory website for display. An automatic watch is kept on the GPS position, with an alert if the buoy moves outside its watch radius. b. Wave Radar

The wave radars are WaveRadar Rex, manufactured by Rosemount (Figure 3). They are downward-looking microwave radars which measure distance to the sea surface. Burst sampling at the Coastal Wave Network radar sites is at 4Hz for ~17.6 minutes, every 20 minutes.

Figure 3 WaveRadar Rex, deployed on Swanage Pier

3 Annual Wave Report 2007

c. Step Gauge The Etrometa step gauge at Herne Bay was first deployed in 1996 and has been in near-continuous operation since then. Burst sampling is at 2.56Hz for 20 minutes, every 20 minutes. At present, the Etrometa logging software cannot operate on a Windows-type computer and therefore the wave data are not transmitted to the website.

d. Pressure sensor Waves in the Solent are measured using a modified Valeport 730D pressure sensor, mounted on the Royal Lymington Yacht Club Starting Platform. Wave parameters are measured hourly; sampling frequency is 2Hz, over ~17.6 minutes, starting on the hour. The sensor at Lymington was replaced with an Etrometa step gauge in May 2007.

e. Data transfer All data from all instruments are time stamped by the shore station computer and the computer clocks are rigorously checked for drift and reset if necessary. Wave parameters can, therefore, be considered as synchronous across all the instrument types and sites. Data are then transmitted to the Channel Coastal Observatory website’s real-time displays. No quality-control is performed on the data displayed on the website, other than flagging for out-of-range values.

4. Data recovery rates

The monthly data recovery rates for 2007 are shown in Figure 4, with the annual data recovery rate since first deployed in Figure 5.

Figure 4 Monthly recovery rates for 2007

4 Annual Wave Report 2007

Figure 5 Annual recovery rates for 2004 to 2007

5. Quality Control Procedures

Archived data are quality controlled for spikes, jumps and out-of-range data, and the thresholds for the spikes etc. are similar to those applied to the WaveNet buoys. No data are removed, but a column of data flags is inserted into the monthly or annual file of parameters. Full details about the flag are contained in the metadata form attached to the archived data parameters.

6. Data availability

Annual files containing quality-checked wave parameters can be downloaded directly from the Channel Coastal Observatory website:

http://www.channelcoast.org/data_management/online_data_catalogue/

Files are tab-delimited ascii text files with a header row. The data are continuous and monotonic (with missing values reported as 9999). All data files downloaded via the website’s Data Catalogue are accompanied by an extensive metadata form.

7. Site Reports

The site reports contain the annual statistics for 2007, consisting of:

• monthly averages • the highest storm events of the year • exceedance values • joint distribution of parameters • a “storm calendar” i.e. occurrence of storms above a threshold since deployment, which allows a straightforward assessment of how “stormy” a year is in comparison to previous years • annual time series of significant wave height

5 Annual Wave Report Herne Bay 2007

Herne Bay Wave Gauge

Location OS: 616870E 169390N WGS84: Latitude: 51° 22' 55.5”N Longitude: 01° 06' 54.66”E

Water Depth ~0.5m CD

Instrument Type Etrometa Step Gauge

Data Quality

C1(%) Sample interval 89 20 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.32 3.1 2.9 - - 31 February 0.21 3.4 3.0 - - 21 March 0.35 3.2 3.0 - - 31 April 0.30 3.2 3.0 - - 30 May 0.24 3.0 2.9 - - 24 June 0.22 2.9 2.9 - - 27 July 0.25 3.1 2.9 - - 12 August 0.26 3.0 2.9 - - 31 September 0.31 3.1 2.9 - - 30 October 0.23 3.1 2.9 - - 31 November 0.30 3.3 3.0 - - 28 December 0.27 3.4 3.0 - - 30 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 20-Mar-2007 1.58 4.5 4.1 - 2.58 HW + 1 5.2 0.35 1.11 14:20 26-Sep-2007 1.51 4.5 3.8 - 2.31 HW - 2 5.0 0.40 0.75 22:40

* Tidal information is obtained from the nearest recording tide gauge (the step gauge also provides tidal data). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

6 Annual Wave Report Herne Bay 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 1996 1.66 1.42 1.33 1.19 0.93 0.72 23-Dec-1996 10:20 1.73 1997 1.50 1.15 1.04 0.88 0.69 0.54 01-Jan-1997 20:00 1.75 1998 1.64 1.17 1.00 0.87 0.71 0.54 08-Oct-1998 11:20 1.74 1999 1.56 1.28 1.16 1.01 0.79 0.62 11-Nov-1999 19:40 1.83 2000 1.61 1.19 1.05 0.92 0.67 0.50 04-Apr-2000 22:20 1.78 2001 1.74 1.30 1.14 0.98 0.77 0.59 08-Nov-2001 15:00 2.12 2002 1.44 1.17 1.05 0.90 0.72 0.54 14-Feb-2002 01:00 1.54 2003 1.60 1.25 1.13 0.96 0.73 0.55 29-Jan-2003 09:40 1.78 2004 1.51 1.25 1.11 0.94 0.70 0.52 07-Jul-2004 14:40 1.71 2005 1.71 1.36 1.21 1.04 0.81 0.61 14-Feb-2005 04:20 1.94 2006 1.50 1.26 1.11 0.93 0.71 0.53 20-Feb-2006 03:20 1.60 2007 1.45 1.23 1.11 0.98 0.76 0.6 20-Mar-2007 14:20 1.58 * i.e. 5 % of the Hs values measured in 2004 exceeded 0.70m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, and Tz for 2007 • Percentage wave height exceedance (all recorded years) – note that the statistics for 1996 were based on measurements from March to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storms during 2007 and for all previous years. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold).

General

The Step gauge was deployed on 19 March 1996. Sections of the gauge were renewed during February and July 2007.

Acknowledgements

TASK2000 tidal prediction software was kindly provided by the Permanent Service for Mean Sea Level, Proudman Oceanographic Laboratory.

7 Annual Wave Report Herne Bay 2007

8 Annual Wave Report Herne Bay 2007

9 Annual Wave Report Herne Bay 2007

10 Annual Wave Report Herne Bay 2007

11 Annual Wave Report Herne Bay 2007

12 Annual Wave Report Deal Pier 2007

Deal Pier Wave Gauge

Location OS: 638145E 152700N WGS84: Latitude: 51° 13' 25.652"N Longitude: 01° 24' 33.332"E

Water Depth N/A

Instrument Type Rosemount WaveRadar Rex

Data Quality All times GMT

C1(%) Sample interval 97 20 minutes

Monthly Means

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.56 8.6 4.6 - - 31 February 0.46 8.9 4.1 - - 27 March 0.50 8.8 4.1 - - 31 April 0.41 8.4 3.7 - - 30 May 0.45 7.7 3.9 - - 27 June 0.38 7.7 3.7 - - 30 July 0.38 7.7 3.8 - - 31 August 0.40 8.0 3.7 - - 31 September 0.45 8.1 4.0 - - 30 October 0.40 8.0 3.7 - - 31 November 0.48 8.1 4.1 - - 30 December 0.52 8.5 4.3 - - 27 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 28-Sep-2007 1.77 9.8 5.8 - 3.20 HW - 1 5.7 0.26 0.37 11:00 20-Mar-2007 1.73 8.3 5.4 - 2.94 HW - 1 5.9 0.33 0.62 11:00 18-Jan-2007 1.71 10.5 7.0 - 1.51 HW + 3 4.3 -0.01 0.83 12:40

* Tidal information is obtained from the nearest recording tide gauge (the radar also provides tidal data). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

13 Annual Wave Report Deal Pier 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 2005 1.58 1.37 1.23 1.12 0.92 0.78 16-Oct-2005 09:40 1.62 2006 1.62 1.37 1.25 1.11 0.91 0.75 26-Jan-2006 08:00 1.68 2007 1.60 1.33 1.22 1.08 0.89 0.75 28-Sep-2007 11:00 1.77 i.e. 2% of the Hs values measured in 2005 exceeded 1.12m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, and Tz • Incidence of storm waves for 2007. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

The wave radar was deployed on 25 August 2005.

Acknowledgements

TASK2000 tidal prediction software was kindly provided by the Permanent Service for Mean Sea Level, Proudman Oceanographic Laboratory.

14 Annual Wave Report Deal Pier 2007

15 Annual Wave Report Deal Pier 2007

16 Annual Wave Report Deal Pier 2007

17 Annual Wave Report Deal Pier 2007

18 Annual Wave Report Deal Pier 2007

19 Annual Wave Report Folkestone 2007

Folkestone Directional WaveRider Buoy

Location OS: 619711E 132538N WGS84: Latitude: 51°03.5335'N Longitude: 01°08.2988'E

Water Depth 12.7m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 99 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.89 5.9 3.8 168 9.4 31 February 0.69 6.0 3.7 158 8.4 28 March 0.59 6.5 3.9 149 9.2 31 April 0.33 5.4 3.4 118 10.4 30 May 0.59 5.2 3.6 148 12.9 31 June 0.49 4.8 3.4 150 15.3 30 July 0.62 4.5 3.4 175 16.8 30 August 0.44 4.7 3.5 145 18.1 31 September 0.46 5.3 3.8 142 17.6 30 October 0.45 5.1 3.5 132 15.3 31 November 0.61 5.6 4.0 154 11.6 30 December 0.77 5.7 3.7 152 9.2 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 08-Dec-2007 2.86 7.7 5.4 183 -2.2 HW - 6 4.5 -0.02 0.55 17:00 18-Jan-2007 2.59 - 4.4 - - HW + 3 4.9 - - 13:00 06-Mar-2007 2.51 6.7 4.9 174 -1.87 HW + 5 5.6 0.16 0.81 06:00

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge at Dover). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

20 Annual Wave Report Folkestone 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2003 2.79 2.23 2.03 1.75 1.37 1.16 29-Nov-2003 13:30 3.07 2004 2.91 2.30 1.97 1.75 1.44 1.18 08-Oct-2004 12:00 3.25 2005 2.90 2.15 1.81 1.54 1.25 0.97 30-Dec-2005 14:00 3.15 2006 2.55 2.08 1.84 1.68 1.42 1.17 03-Dec-2006 09:00 3.13 2007 2.56 2.06 1.83 1.59 1.34 1.11 08-Dec-2007 17:00 2.86 * i.e. 5 % of the Hs values measured in 2003 exceeded 1.37m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedence (all recorded years) – note that the statistics for 2003 were based on measurements from July to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storms during 2007 and for all previous years. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

The buoy was first deployed on 08 July 2003. The wave directions recorded by the Datawell Directional WaveRider Mk III were found to be contaminated by a significant tidal signature, compounded by the on-board data processing. The buoy received new electronics to fix this problem in February 2004; wave directions measured before April 2004 were excluded from the analysis.

Acknowledgements

Tidal data were supplied by the British Oceanographic Data Centre as part of the function of the National Tidal and Sea Level Facility, hosted by the Proudman Oceanographic Laboratory and funded by DEFRA and the Natural Environment Research Council.

21 Annual Wave Report Folkestone 2007

22 Annual Wave Report Folkestone 2007

23 Annual Wave Report Folkestone 2007

24 Annual Wave Report Folkestone 2007

25 Annual Wave Report Folkestone 2007

26 Annual Wave Report Folkestone 2007

27 Annual Wave Report Pevensey Bay 2007

Pevensey Bay Directional WaveRider Buoy

Location OS: 569358E 99118N WGS84: Latitude: 50°47'0.2''N Longitude: 00°25'1.5''E

Water Depth 9.8m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 99 30 minutes

Monthly Means All times are GMT

Hs Tp Tm Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 1.28 6.6 4.3 202 9.3 31 February 0.93 6.5 4.0 184 8.5 26 March 0.79 7.1 4.0 182 9.2 30 April 0.44 5.5 3.4 137 10.8 30 May 0.79 5.3 3.7 175 13.4 31 June 0.62 5.4 3.5 182 16.0 30 July 0.80 5.2 3.6 205 17.5 31 August 0.53 4.6 3.3 168 18.4 31 September 0.56 5.1 3.4 174 17.7 30 October 0.57 5.6 3.5 158 15.4 31 November 0.75 5.5 3.8 184 12.2 30 December 1.16 6.4 4.2 180 9.7 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 18-Jan-2007 4.23 10.0 6.8 222 2.42 HW + 2 4.8 0.54 0.91 12:00 11-Jan-2007 3.60 10.0 6.2 211 0.77 HW - 2 3.4 -0.04 0.77 14:00 06-Mar-2007 3.32 8.3 6.1 204 -2.12 HW + 6 5.7 0.46 0.62 06:30 02-Dec-2007 3.14 9.1 5.6 210 0.46 HW - 2 3.5 0.16 0.55 14:30 03-Mar-2007 3.09 8.3 6.0 212 -0.12 HW + 5 5.3 0.38 0.58 02:00

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge at Newhaven). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

Annual Wave Report Pevensey Bay 2007

Annual Statistics

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2003 3.38 2.66 2.41 2.08 1.61 1.34 02-Nov-2003 11:30 4.18 2004 3.65 2.72 2.51 2.24 1.86 1.53 31-Oct-2004 17:00 3.92 2005 3.44 2.83 2.37 2.09 1.71 1.31 03-Dec-2005 00:00 3.55 2006 3.59 2.89 2.64 2.33 1.91 1.59 03-Dec-2006 09:30 4.10 2007 3.85 2.84 2.58 2.26 1.89 1.54 18-Jan-2007 12:00 4.23 * i.e. 5 % of the Hs values measured in 2003 exceeded 1.61m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance (all recorded years) – note that the statistics for 2003 were based on measurements from July to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storms during 2007 and for all previous years. Storms are defined using the Peaks-over-Threshold method. The highest Hs of each storm is shown. • Annual time series of Hs (red line is storm threshold)

General

The buoy was first deployed on 8 July 2003. The wave directions recorded by the Datawell Directional WaveRider Mk III were found to be contaminated by a significant tidal signature, compounded by the on-board data processing. The buoy received new electronics to fix this problem in late March 2004; wave directions measured before April 2004 were excluded from the analysis.

Acknowledgements

Annual Wave Report Pevensey Bay 2007

Annual Wave Report Rustington 2007

Rustington Directional WaveRider Buoy

Location OS: 506331E 93784N WGS84: Latitude: 50°44.0365'N Longitude: 00°29.6765'W

Water Depth 9.9m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 99 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 1.33 7.7 4.3 205 9.1 31 February 1.15 9.2 4.5 195 8.1 27 March 0.86 8.6 4.2 197 9.0 31 April 0.43 7.2 3.6 167 10.9 30 May 0.84 5.6 3.7 197 13.6 31 June 0.67 6.0 3.6 197 16.4 30 July 0.87 5.1 3.6 215 17.4 31 August 0.58 4.6 3.2 194 18.4 31 September 0.60 4.3 3.2 205 17.5 30 October 0.60 6.5 3.6 180 15.1 31 November 0.70 5.3 3.5 207 12.4 19 December 1.23 7.6 4.3 187 9.5 31

Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 18-Jan-2007 4.32 10.0 6.8 217 3.13 HW 4.4 0.59 0.91 10:00 11-Jan2007 3.77 10.5 6.3 212 0.77 HW - 2 3.2 -0.04 0.77 14:00 06-Mar-2007 3.58 9.1 6.6 205 0.11 HW + 3 5.5 0.60 0.61 04:00 09-Dec-2007 3.51 10.0 7.1 217 2.56 HW + 1 4.9 0.38 0.61 12:00 03-Mar-2007 3.23 9.1 6.3 221 1.80 HW + 2 4.9 0.48 0.57 01:00

* Tidal information is obtained from the nearest recording tide gauge (at Newhaven). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

36 Annual Wave Report Rustington 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 2003 3.27 2.76 2.47 2.27 1.85 1.45 29-Nov-2003 13:00 3.34 2004 3.83 2.81 2.62 2.37 2.03 1.65 08-Jan-2004 11:30 4.17 2005 3.64 3.01 2.56 2.19 1.79 1.42 02-Dec-2005 19:00 3.84 2006 3.84 3.01 2.76 2.45 2.05 1.68 03-Dec-2006 08:00 4.81 2007 3.89 2.98 2.7 2.41 2.03 1.69 18-Jan-2007 10:00 4.32 * i.e. 5 % of the measured Hs values in 2003 exceeded 1.85m

Distribution plots

General

The buoy was first deployed on 9 July 2003. The wave directions recorded by the Datawell Directional WaveRider Mk III were found to be contaminated by a significant tidal signature, compounded by the on-board data processing. The buoy received new electronics to fix this problem in February 2004; wave directions measured before March 2004 were excluded from analysis.

Acknowledgements

37 Annual Wave Report Rustington 2007

38 Annual Wave Report Rustington 2007

39 Annual Wave Report Rustington 2007

40 Annual Wave Report Rustington 2007

41 Annual Wave Report Rustington 2007

42 Annual Wave Report Rustington 2007

43 Annual Wave Report Hayling Island 2007

Hayling Island Directional WaveRider Buoy

Location OS: 473504E 93216N WGS84: Latitude: 50°43.9936'N Longitude: 00°57.5557'W

Water Depth 10.2m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 98 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 1.11 10.5 4.2 186 9.5 31 February 1.03 11.6 4.8 181 8.2 28 March 0.75 10.1 4.3 190 9.2 31 April 0.36 8.7 3.5 168 11.3 30 May 0.68 6.2 3.5 192 13.8 31 June 0.55 6.3 3.5 191 16.4 29 July 0.68 5.6 3.4 201 17.4 30 August 0.43 5.3 3.1 188 18.4 25 September 0.48 4.6 3.0 214 17.7 30 October 0.49 7.9 3.6 178 15.1 31 November 0.62 5.4 3.4 200 12.2 30 December 1.02 10.2 4.3 178 9.2 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website

Highest storm events in 2007 Water Tidal Tidal Tidal Max. level stage Date/Time H T T Dir. * range surge* surge* s p z elevation (hours re. (m) (m) (m) (OD) HW) 18-Jan-2007 3.58 10.0 6.3 204 1.36 HW + 3 3.0 0.33 0.79 13:00 06-Mar-2007 3.34 9.1 6.3 194 -0.51 HW + 4 3.7 0.78 0.80 05:00 09-Dec-2007 2.86 13.3 7.0 191 0.71 HW + 3 3.0 0.33 0.55 14:00 12-Feb-2007 2.84 13.3 6.1 186 0.36 HW - 3 1.5 0.43 0.87 15:30 11-Jan-2007 2.74 11.1 5.1 187 0.32 HW - 2 2.1 0.00 -0.56 14:00

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge at Portsmouth). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

Annual Wave Report Hayling Island 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 2003 2.65 2.33 2.11 1.85 1.41 1.10 29-Nov-2003 10:00 2.68 2004 3.08 2.32 2.11 1.91 1.60 1.26 08-Jan-2004 10:30 3.64 2005 3.24 2.53 2.10 1.80 1.41 1.11 02-Dec-2005 17:00 3.53 2006 3.03 2.48 2.28 2.06 1.71 1.39 03-Dec-2006 08:00 3.42 2007 3.23 2.59 2.33 2.08 1.72 1.41 18-Jan-2007 13:00 3.58 * i.e. 5 % of the Hs values measured in 2003 exceeded 1.41m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance (all recorded years) – note that the statistics for 2003 were based on measurements from July to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storms during 2007 and for all previous years. Storms are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

The buoy was first deployed on 10 July 2003. The wave directions recorded by the Datawell Directional WaveRider Mk III were found to be contaminated by a significant tidal signature, compounded by the on-board data processing. The buoy received new electronics to fix this problem in February 2004; wave directions measured before March 2004 were excluded from the analysis.

Acknowledgements

Annual Wave Report Hayling Island 2007

Annual Wave Report Sandown Bay 2007

Sandown Bay Directional WaveRider Buoy

Location OS: 461654E 83776N WGS84: Latitude: 50°39.0240'N Longitude: 01°07.7555'W

Water Depth 10.7m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 100 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.70 6.7 4.0 173 9.6 31 February 0.68 7.6 4.0 164 8.4 28 March 0.49 7.6 4.0 162 9.1 31 April 0.33 5.6 3.6 140 10.8 30 May 0.51 5.5 3.6 165 13.3 31 June 0.40 5.2 3.5 164 15.8 30 July 0.47 5.2 3.5 179 17.1 31 August 0.35 4.9 3.4 157 18.2 31 September 0.34 4.9 3.4 160 17.7 29 October 0.44 5.5 3.6 149 15.4 31 November 0.48 5.4 3.8 165 12.6 30 December 0.73 6.6 4.0 159 9.6 31

Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 18-Nov-2007 3.22 7.7 6.0 156 1.02 HW -1 1.8 0.02 0.21 16:00 06-Mar-2007 2.74 7.7 5.8 172 -0.39 HW +4 3.2 0.68 0.68 05:00

* Tidal information is obtained from the nearest recording tide gauge (the wave radar at Sandown Pier also provides tidal data). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

52 Annual Wave Report Sandown Bay 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 2003 2.64 2.21 2.02 1.65 1.35 1.13 29-Nov-2003 09:00 2.79 2004 2.64 2.11 1.82 1.61 1.29 0.97 08-Jan-2004 10:30 3.17 2005 3.23 2.15 1.69 1.44 1.11 0.86 02-Dec-2005 18:00 3.79 2006 2.47 1.97 1.80 1.61 1.33 1.10 30-Dec-2006 00:00 2.75 2007 3.06 1.91 1.64 1.44 1.18 0.96 18-Nov-2007 16:00 3.22 * i.e. 5 % of the measured Hs values in 2003 exceeded 1.35m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance (all recorded years) – note that the statistics for 2003 were based on measurements from July to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storms during 2007 and for all previous years. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

Acknowledgements

TASK2000 tidal prediction software was kindly provided by the Permanent Service for Mean Sea Level, Proudman Oceanographic Laboratory.

53 Annual Wave Report Sandown Bay 2007

54 Annual Wave Report Sandown Bay 2007

55 Annual Wave Report Sandown Bay 2007

56 Annual Wave Report Sandown Bay 2007

57 Annual Wave Report Sandown Bay 2007

58 Annual Wave Report Sandown Bay 2007

59 Annual Wave Report Sandown Pier 2007

Sandown Pier Wave Gauge

Location OS: 459964E 83835N WGS84: Latitude: 50°65.111’N Longitude: 01°15.316’W

Water Depth N/A

Instrument Type Rosemount WaveRadar Rex

Data Quality

C1(%) Sample interval 93 20 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.43 11.4 4.1 - - 30 February 0.45 11.9 4.0 - - 28 March 0.36 12.3 3.9 - - 28 April 0.31 11.9 3.6 - - 21 May 0.35 10.9 3.7 - - 27 June 0.32 11.6 3.6 - - 30 July 0.33 10.9 3.6 - - 27 August 0.31 12.9 3.5 - - 31 September 0.29 13.0 3.5 - - 28 October 0.37 11.9 3.6 - - 31 November 0.41 12.3 3.7 - - 30 December 0.48 11.1 4.0 - - 29

Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 18-Nov-2007 2.00 9.3 5.2 - 1.04 HW + 1 1.8 -0.02 0.20 17:40 06-Mar-2007 1.71 9.4 5.1 - 1.49 HW + 2 3.2 0.52 0.60 03:00 08-Feb-2007 1.55 8.5 4.3 - 1.60 HW + 2 2.6 0.26 0.56 04:20

* Tidal information is obtained from the nearest recording tide gauge (the wave radar also provides tidal data). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

60 Annual Wave Report Sandown Pier 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 2006 1.66 1.36 1.26 1.13 0.87 0.66 03-Dec-2006 06:40 1.82 2007 1.85 1.26 1.07 0.93 0.72 0.58 18-Nov-2007 17:40 2.00 * i.e. 5 % of the Hs values measured in 2006 exceeded 0.87m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Incidence of storms during 2007. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

The wave radar was deployed on 04 May 2006.

Acknowledgements

TASK2000 tidal prediction software was kindly provided by the Permanent Service for Mean Sea Level, Proudman Oceanographic Laboratory.

61 Annual Wave Report Sandown Pier 2007

62 Annual Wave Report Sandown Pier 2007

63 Annual Wave Report Sandown Pier 2007

64 Annual Wave Report Sandown Pier 2007

65 Annual Wave Report Sandown Pier 2007

66 Annual Wave Report Milford 2007

Milford Waverider Buoy

Location OS: 427297E 90361N WGS84: Latitude: 50°42'73'' N Longitude: 001°36'93'' W

Water Depth Approx. 10m CD

Instrument Type Datawell WaveRider Buoy Mk III (from 17 November 2005) Datawell WaveRider Buoy Mk II

Data Quality

C1(%) Sample interval 96 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 1.11 9.1 4.3 209 9.7 31 February 0.96 12.3 5.2 211 8.6 28 March 0.67 10.3 4.4 213 9.6 31 April 0.25 10.0 4.1 206 11.2 29 May 0.65 7.1 3.9 216 13.9 31 June 0.55 7.6 4.1 214 16.6 30 July 0.76 5.9 3.8 216 17.6 29 August 0.45 6.1 3.5 217 18.4 27 September 0.46 5.9 3.5 217 17.6 25 October 0.40 8.5 4.5 210 15.2 29 November 0.52 6.2 3.8 214 12.0 30 December 0.92 10.1 4.6 211 9.5 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re HW) 18-Jan-2007 3.64 11.1 7.0 214 - HW + 2 1.8 - - 12:00 11-Jan-2007 3.29 10.5 6.3 221 - HW + 3 1.3 - - 09:30 12-Feb-2007 3.21 10.5 6.6 212 - HW + 4 1.1 - - 10:00 02-Dec-2007 3.10 9.1 6.0 222 - HW + 6 1.4 - - 11:30

* Tidal information is obtained from the nearest recording tide gauge (the gauge on Royal Lymington Yacht Club starting platform). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

Annual Wave Report Milford 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 1996 ------28-Oct-1996 21:00 4.05 1997 3.08 2.39 2.15 1.97 1.59 1.20 24-Feb-1997 23:00 3.32 1998 2.89 2.47 2.28 2.00 1.66 1.37 27-Oct-1998 13:00 3.21 1999 3.01 2.32 2.11 1.85 1.56 1.29 24-Dec-1999 22:00 3.23 2000 3.90 2.85 2.50 2.19 1.74 1.41 31-Dec-2000 19:00 4.09 2001 3.71 2.63 2.24 1.91 1.52 1.20 01-Jan-2001 00:00 4.07 2002 3.54 2.92 2.61 2.35 1.96 1.62 15-Oct-2002 18:00 4.06 2003 2.82 2.20 2.02 1.76 1.37 1.12 14-Nov-2003 15:00 2.92 2004 3.21 2.49 2.29 2.05 1.69 1.42 31-Jan-2004 17:00 3.44 2005 3.09 1.86 1.72 1.56 1.28 1.05 02-Dec-2005 18:30 3.53 2006 2.89 2.46 2.31 2.10 1.73 1.41 03-Dec-2006 06:30 3.51 2007 3.21 2.53 2.25 2.04 1.74 1.46 18-Jan-2007 12:00 3.64 * i.e. 5 % of the Hs values measured in 2004 exceeded 1.69m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, and Tz for 2007 • Percentage wave height exceedance (all recorded years) – note that the statistics for 1996 were based on measurements from May to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence – note that measurement of Tp began in December 2004 • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storms above a given threshold, for 2007 and for all years. Storms are defined by the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

The buoy was first deployed in May 1996. The buoy was badly damaged in early October 2005 and was replaced with a directional wave buoy on 17 November 2005.

Acknowledgements

TASK2000 tidal prediction software was kindly provided by the Permanent Service for Mean Sea Level, Proudman Oceanographic Laboratory.

Annual Wave Report Milford 2007

Annual Wave Report Boscombe 2007

Boscombe Directional WaveRider Buoy

Location OS: 411413E 90302N WGS84: Latitude: 50o 42.681’N Longitude: 001o 50.376’W

Water Depth 10.4m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 99 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.80 9.6 4.2 185 9.8 31 February 0.78 10.2 4.4 180 8.6 28 March 0.54 10.0 4.5 179 9.5 30 April 0.30 6.9 3.8 167 11.2 30 May 0.55 6.1 3.9 176 13.6 31 June 0.45 5.9 3.6 181 16.4 30 July 0.56 5.4 3.5 187 17.2 31 August 0.37 5.6 3.6 178 18.2 31 September 0.35 5.3 3.7 177 17.6 30 October 0.42 6.9 4.0 172 15.2 31 November 0.48 6.0 3.9 179 12.0 28 December 0.77 9.0 4.3 176 9.7 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 18-Nov-2007 3.19 7.7 5.9 177 0.43 HW - 4 0.3 0.12 0.13 14:00 06-Mar-2007 2.87 7.7 5.6 186 1.14 HW + 4 0.9 0.75 0.80 02:00 08-Dec-2007 2.34 6.3 5.0 179 0.30 HW + 6 1.2 0.40 0.56 13:30

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge on Bournemouth Pier). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

Annual Wave Report Boscombe 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2003 2.74 2.17 1.95 1.53 1.19 0.98 14-Nov-2003 11:00 2.79 2004 2.98 2.28 1.96 1.69 1.30 1.02 08-Jan-2004 09:30 3.62 2005 2.62 1.81 1.59 1.40 1.11 0.90 02-Nov-2005 01:00 2.84 2006 2.82 2.24 2.03 1.82 1.47 1.17 29-Dec-2006 23:00 3.14 2007 2.94 2.07 1.84 1.63 1.33 1.07 18-Nov-2007 14:00 3.19 * i.e. 5 % of the Hs values measured in 2003 exceeded 1.19m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance (all recorded years) – note that the statistics for 2003 were based on measurements from July to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storm waves for 2007 and for all previous years. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. Note that the buoy was not deployed during the late autumn storms in 2005 – see below. • Annual time series of Hs (red line is storm threshold)

General

The wave directions recorded by the Datawell Directional WaveRider Mk III were found to be contaminated by a significant tidal signature, compounded by the on-board data processing. The buoy received new electronics to fix this problem in February 2004; wave directions measured before March 2004 were excluded from the analysis.

The buoy was badly damaged in November 2005, just prior to the series of storms which occurred that month. The buoy was replaced in December 2005.

Acknowledgements

Annual Wave Report Boscombe 2007

Annual Wave Report Swanage Pier 2007

Swanage Pier Wave Gauge

Location OS: 459964E 83835 N WGS84: Latitude: 50°36'33.68"N Longitude: 1°56'57.10"W

Water Depth N/A

Instrument Type Rosemount WaveRadar Rex

Data Quality

C1(%) Sample interval 78 20 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January ------February ------March 0.35 3.8 3.6 - - 24 April 0.37 3.7 3.4 - - 23 May 0.35 11.9 3.5 - - 28 June 0.33 15.1 3.4 - - 30 July 0.33 15.8 3.4 - - 29 August 0.31 14.9 3.3 - - 31 September 0.30 15.2 3.3 - - 29 October 0.36 13.5 3.5 - - 31 November 0.36 14.7 3.5 - - 30 December 0.46 15.6 4.0 - - 30 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation * range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 18-Nov-2007 1.65 9.3 5.5 - 0.26 HW + 6 0.5 - - 18:20 17-Dec-2007 1.38 8.1 4.5 - 0.14 HW + 5 0.6 - - 17:20

83 Annual Wave Report Swanage Pier 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs (m) 0.05% 0.5% 1% 2% 5% 10% Date Amax 2006 1.66 1.36 1.26 1.13 0.87 0.66 03-Dec-2006 06:40 1.82 2007 1.35 0.94 0.83 0.71 0.55 0.48 18-Nov-2007 18:20 1.65 * i.e. 5 % of the Hs values measured in 2006 exceeded 0.87m

Distribution plots

General

The wave radar was deployed on 04 May 2006.

Acknowledgements

TASK2000 tidal prediction software was kindly provided by the Permanent Service for Mean Sea Level, Proudman Oceanographic Laboratory.

84 Annual Wave Report Swanage Pier 2007

85 Annual Wave Report Swanage Pier 2007

86 Annual Wave Report Swanage Pier 2007

87 Annual Wave Report Swanage Pier 2007

88 Annual Wave Report Swanage Pier 2007

Swanage Pier – Significant Wave Height (Hs) 2007

89 Annual Wave Report Weymouth 2007

Weymouth Directional Waverider Buoy

Location OS: E 371646 N 81037 WGS84: Latitude: 50° 37.699' N Longitude: 002° 24.133' W

Water Depth 10m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 98 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.62 8.0 4.1 161 10.0 30 February 0.65 9.1 4.1 156 9.2 27 March 0.46 8.0 4.2 159 9.8 30 April 0.32 6.2 3.5 139 11.0 30 May 0.47 6.0 3.7 158 12.9 30 June 0.36 5.8 3.7 159 15.6 29 July 0.41 5.3 3.5 164 16.6 30 August 0.32 4.9 3.5 147 17.6 31 September 0.28 4.9 3.5 157 17.5 30 October 0.41 6.0 3.8 147 15.7 31 November 0.38 5.5 3.9 156 13.0 30 December 0.67 7.0 4.0 152 10.4 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 18-Nov-2007 2.56 7.7 5.6 162 - HW + 2 0.6 - - 13:30 06-Mar-2007 2.20 8.3 5.2 162 0.34 HW - 6 2.0 0.81 0.82 02:00 04-Mar-2007 2.07 6.3 5.1 141 -0.14 HW - 5 1.8 0.48 0.55 14:30 08-Feb-2007 2.02 6.3 4.8 132 0.25 HW - 6 1.4 0.54 0.55 03:30

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge at Weymouth). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

90 Annual Wave Report Weymouth 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2007 2.29 1.72 1.43 1.24 1.03 0.85 18-Nov-2007 13:30 2.56 * i.e. 5 % of the Hs values measured in 2007 exceeded 1.03m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records • Incidence of storm waves for 2007. Storm events are defined using the Peaks-over- Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

The WaveRider was first deployed on the 18 December 2006.

Acknowledgements

91 Annual Wave Report Weymouth 2007

92 Annual Wave Report Weymouth 2007

93 Annual Wave Report Weymouth 2007

94 Annual Wave Report Weymouth 2007

95 Annual Wave Report Weymouth 2007

96 Annual Wave Report Weymouth 2007

97 Annual Wave Report Chesil 2007

Chesil Directional WaveRider Buoy

Location OS: E 363149.7 N 78203.25 WGS84: Latitude: 50° 36.142' N o Longitude: 002° 31.324' W

Water Depth 10m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 62 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 2.23 8.6 5.3 227 10.3 9 February - - - - 9.2 0 March - - - - 9.8 0 April - - - - - 0 May 0.71 5.4 3.7 235 13.2 7 June 0.81 8.2 4.8 225 15.1 30 July 1.00 6.2 4.2 225 16.3 30 August 0.63 6.6 3.9 221 17.2 31 September 0.62 6.2 3.8 219 17.2 30 October 0.68 8.5 5.0 216 15.4 31 November 0.77 6.6 4.1 221 12.9 30 December 1.45 8.7 5.3 216 10.4 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 02-Dec-2007 4.87 9.1 7.1 229 - HW - 2 1.6 - - 11:00 09-Dec-2007 4.51 10.0 6.9 226 - HW + 4 3.0 - - 10:30 01-Jan-2007 4.42 10.0 6.7 225 0.81 HW + 1 3.3 -0.03 0.19 05:30 11-Jan-2007 4.20 10.0 6.7 228 0.53 HW - 5 1.8 0.35 0.39 06:00 03-Jan-2007 4.06 8.3 6.7 226 0.74 HW + 3 2.7 0.08 0.17 21:00

Annual Wave Report Chesil 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2007 4.48 3.55 3.3 3.04 2.47 1.91 02/12/2007 11:00 4.87 * i.e. 5 % of the Hs values measured in 2007 exceeded 2.47m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance (all recorded years) • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storm waves for 2007. Storm events are defined using the Peaks-over- Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold).

General

The wave buoy at Chesil was deployed on 22 December 2006. A fault was discovered with the buoy which required it to be returned to Datawell. The repaired buoy was re-deployed on 24 May 2007.

Acknowledgements

Annual Wave Report Chesil 2007

100

Annual Wave Report Chesil 2007

101

Annual Wave Report Chesil 2007

102

Annual Wave Report Chesil 2007

103

Annual Wave Report Chesil 2007

104

Annual Wave Report Chesil 2007

105

Annual Wave Report West Bay 2007

West Bay Directional Waverider Buoy

Location OS: E 347102 N 88446 WGS84: Latitude: 50° 41.593' N Longitude: 002° 45.020' W

Water Depth 10m CD

Instrument Type Datawell Directional WaveRider Buoy Mk III

Data Quality

C1(%) Sample interval 79 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 1.46 8.8 4.8 209 10.2 31 February 1.35 10.9 5.5 207 9.2 28 March 1.94 10.4 5.9 211 10.0 8 April - - - - - 0 May 0.60 6.8 3.8 209 13.5 7 June 0.73 8.0 4.5 214 15.6 30 July 0.89 5.7 4.0 214 16.3 31 August 0.56 6.8 3.9 211 17.3 31 September 0.53 6.3 3.9 208 17.2 30 October 0.62 8.3 4.6 203 15.3 31 November 0.65 6.7 4.0 211 12.7 30 December 1.28 8.6 4.8 205 10.3 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 06-Mar-2007 5.61 11.8 7.8 212 1.28 HW -6 2.0 0.77 0.81 02:30 18-Jan-2007 4.63 10.5 7.5 225 1.10 HW +6 1.4 0.43 0.60 12:00 11-Jan-2007 4.44 10.0 7.0 225 1.78 HW 0.9 0.12 0.39 10:30 02-Dec-2007 4.22 9.1 7.1 217 - HW -1 0.9 - - 11:00

106 Annual Wave Report West Bay 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2007 4.88 3.7 3.31 2.92 2.45 2.03 06/03/2007 02:30 5.61 * i.e. 5 % of the Hs values measured in 2007 exceeded 2.45m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance (all recorded years) – note that the statistics for 2003 were based on measurements from July to December only • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Cumulative joint distribution of parameters from start of records (percentage of occurrence only) • Incidence of storm waves for 2007 and for all previous years. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. Note that the buoy was not deployed during the late autumn storms – see below. • Annual time series of Hs (red line is storm threshold)

General

The WaveRider was deployed on 19 November 2006. It was cut from its mooring on 10 January 207 and re-deployed on 12 January. In early March a fault was discovered which required repair by Datawell. The buoy was re-deployed on 24 May 2007.

Acknowledgements

107 Annual Wave Report West Bay 2007

108 Annual Wave Report West Bay 2007

109 Annual Wave Report West Bay 2007

110 Annual Wave Report West Bay 2007

111 Annual Wave Report West Bay 2007

112 Annual Wave Report Start Bay 2007

Start Bay Directional Waverider Buoy

Location OS: E 284494 N 44824 WGS84: Latitude: 50° 17.486' N Longitude: 003° 37.000' W

Water Depth 10m CD

Instrument Type Datawell Directional Waverider Mk III

Data Quality

C1(%) Sample interval 68 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January ------February ------March ------April 0.41 8.1 3.9 146 11.3 25 May 0.60 7.2 4.1 148 12.9 27 June 0.55 7.3 4.1 162 14.6 28 July 0.51 6.7 3.9 164 14.9 23 August 0.46 6.5 4.0 138 16.7 29 September 0.40 5.5 3.7 133 17.0 30 October 0.69 7.1 4.2 142 15.8 26 November 0.47 6.7 4.2 146 14.0 30 December 1.09 8.4 4.8 156 11.4 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 17-Dec-2007 3.41 8.3 6.2 100 1.11 HW 2.5 -0.20 -0.24 23:30 09-Dec-2007 2.65 10.0 6.0 186 0.38 HW + 2 3.5 0.23 0.25 08:30 05-Dec-2007 2.50 8.3 5.5 186 0.27 HW + 3 2.2 0.09 0.11 05:30 14-Aug-2007 2.38 7.7 5.4 184 1.14 HW + 2 4.1 0.16 0.38 09:00

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge at Devonport). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

113 Annual Wave Report Start Bay 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2007 3.21 2.13 1.93 1.71 1.43 1.15 17-Dec-2007 23:30 3.41 * i.e. 5 % of the Hs values measured in 2007 exceeded 1.43m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Incidence of storms during 2007 and for all previous years. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. • Annual time series of Hs (red line is storm threshold)

General

The buoy was first deployed on 4 April 2007.

Acknowledgements

114 Annual Wave Report Start Bay 2007

115 Annual Wave Report Start Bay 2007

116 Annual Wave Report Start Bay 2007

117 Annual Wave Report Start Bay 2007

118 Annual Wave Report Start Bay 2007

Start Bay- Significant Wave Height (Hs) 2007

119 Annual Wave Report Penzance 2007

Penzance Directional Waverider Buoy

Location OS: E 149633 N 29525 WGS84: Latitude: 50° 06.773' N Longitude: 005° 30.201' W

Water Depth 10.4m CD

Instrument Type Datawell Directional Waverider Mk III

Data Quality

C1(%) Sample interval 73 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January ------February ------March ------April 0.33 9.5 4.1 175 12.3 24 May 0.57 8.1 4.3 186 13.1 31 June 0.62 7.8 4.1 190 15.3 30 July 0.56 6.5 4.1 189 14.9 31 August 0.37 7.2 4.0 167 15.8 31 September 0.30 7.2 4.0 179 16.4 30 October 0.52 8.4 4.5 179 15.2 31 November 0.39 8.1 4.5 191 13.6 30 December 1.00 8.5 4.4 180 11.6 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Water Tidal Tidal Tidal Max. level stage Date/Time H T T Dir. * range surge* surge* s p z elevation (hours re. (m) (m) (m) (OD) HW) 20-Jun-2007 2.96 10.5 6.3 191 1.02 HW + 1 3.5 0.34 0.38 09:00 18-Nov-2007 2.74 7.1 5.7 187 -0.23 HW + 5 2.5 0.07 -0.16 02:00

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge at Newlyn). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

120

Annual Wave Report Penzance 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2007 2.7 2.05 1.84 1.63 1.34 1.1 20-Jun-2007 09:00 2.96 * i.e. 5 % of the Hs values measured in 2007 exceeded 1.34m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Incidence of storms in 2007. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. Annual time series of Hs (red line is storm threshold).

General

The Directional Waverider buoy was first deployed on 5 April 2007.

Acknowledgements

121

Annual Wave Report Penzance 2007

122

Annual Wave Report Penzance 2007

123

Annual Wave Report Penzance 2007

124

Annual Wave Report Penzance 2007

125

Annual Wave Report Penzance 2007

Penzance- Significant Wave Height (Hs) during 2007

126

Annual Wave Report Perranporth 2007

Perranporth Directional Waverider Buoy

Location OS: 174245.247 E 55191.167 N WGS84: Latitude: 50° 21.194' N Longitude: 005° 10.497' W

Water Depth ~10m CD

Instrument Type Datawell Directional Waverider Mk III

Data Quality

C1(%) Sample interval 93 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 3.19 13.3 6.9 286 10.9 20 February 2.41 13.3 7.2 284 10.0 27 March 2.14 11.9 6.3 287 10.5 31 April 0.93 10.5 5.8 284 11.5 30 May 1.59 9.8 5.5 283 13.3 31 June 0.94 8.8 5.2 277 14.9 30 July 1.39 8.8 5.0 280 16.2 31 August 1.09 8.1 4.7 290 16.9 24 September 1.13 8.2 4.8 293 16.5 30 October 1.15 11.2 6.6 283 15.2 31 November 1.34 8.8 5.1 294 13.1 30 December 2.42 13.0 7.0 283 11.4 27 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 09-Dec-2007 8.14 - 10 - - HW + 1 4.4 -0.15 -0.22 18:00 07-Dec-2007 6.26 12.5 8.2 281 - HW - 2 4.0 -0.24 -0.25 13:30 02-Dec-2007 6.23 11.8 8.2 281 - HW - 1 3.7 -0.07 -0.15 23:00 21-Jan-2007 5.93 - 8.5 - - HW - 5 5.9 0.00 0.15 01:00

* Tidal information is obtained from the nearest recording tide gauge (tidal stage and range are from predicted tides at St Ives, surge information is from the National Network gauge at Newlyn). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

127 Annual Wave Report Perranporth 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2007 6.9 5.21 4.89 4.48 3.79 3.12 09-Dec-2007 18:00 8.14 * i.e. 5 % of the Hs values measured in 2007 exceeded 3.79m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Incidence of storms in 2007. Storm events are defined using the Peaks-over-Threshold method. The highest Hs of each storm event is shown. Annual time series of Hs (red line is storm threshold)

General

The Waverider was deployed on 18 December 2006. A fault was discovered in late January 2007, which required repair by Datawell. A replacement buoy was deployed on 1 February 2007. The mooring line was cut and the buoy came ashore on 17 August 2007. A spare buoy was re-deployed on 25 August.

Acknowledgements

128 Annual Wave Report Perranporth 2007

129 Annual Wave Report Perranporth 2007

130 Annual Wave Report Perranporth 2007

131 Annual Wave Report Perranporth 2007

132 Annual Wave Report Perranporth 2007

133 Annual Wave Report Minehead 2007

Minehead Directional Waverider Buoy

Location OS: E 297326 N 148693 WGS84: Latitude: 51° 13.690' N Longitude: 003° 28.310' W

Water Depth ~10m CD

Instrument Type Datawell Directional WaveRider Mk III

Data Quality

C1(%) Sample interval 97 30 minutes

Monthly Means All times GMT

Hs Tp Tz Direction SST No. of Month o o (m) (s) (s) ( ) ( C) days January 0.86 6.5 4.3 283 9.1 30 February 0.56 9.1 4.2 267 8.2 28 March 0.63 6.6 4.0 261 9.0 27 April 0.37 6.5 3.7 224 10.6 29 May 0.60 5.3 3.7 256 13.5 27 June 0.37 6.1 3.7 270 15.6 30 July 0.58 5.6 3.9 293 16.8 31 August 0.47 5.3 3.7 281 17.9 31 September 0.49 5.5 3.6 268 17.3 30 October 0.41 6.6 3.9 242 15.1 31 November 0.61 5.7 3.7 269 12.3 30 December 0.87 6.7 4.4 243 9.2 31 Tables and plots of these values, together with the minimum and maximum values and the standard deviation are available on the website.

Highest storm events in 2007 Tidal Water level Tidal Tidal Max. stage Date/Time H T T Dir. elevation* range surge* surge* s p z (hours (OD) (m) (m) (m) re. HW) 02-Dec-2007 2.55 8.3 5.1 307 0.10 HW - 4 4.8 0.45 0.52 21:00 07-Dec-2007 2.47 9.1 5.2 305 3.19 HW 7.0 0.23 -0.31 05:00 09-Dec-2007 2.34 7.7 6.7 295 - HW - 5 7.9 - - 10:30 18-Mar-2007 2.28 7.1 6.3 304 -0.43 HW + 3 9.5 -0.11 0.33 08:30 12-Feb-2007 2.22 5.9 4.6 300 1.50 HW - 1 3.7 0.12 0.70 11:30

* Tidal information is obtained from the nearest recording tide gauge (the National Network gauge at Ilfracombe). The surge shown is the residual at the time of the highest Hs. The maximum tidal surge is the largest positive surge during the storm event.

134

Annual Wave Report Minehead 2007

Year Annual Hs exceedance* (m) Annual Maximum Hs 0.05% 0.5% 1% 2% 5% 10% Date Amax (m) 2007 2.36 2 1.84 1.67 1.38 1.09 02-Dec-2007 21:00 2.55 * i.e. 5 % of the Hs values measured in 2007 exceeded 1.38m

Distribution plots

The distribution of wave parameters are shown in the accompanying graphs of: • Percentage of occurrence of Hs, Tp, Tz and Direction for 2007 • Percentage wave height exceedance (all recorded years) • Joint distribution of all parameters for 2007, given both as number of observations and as percentage of occurrence • Incidence of storms in 2007 and for all previous years. Storm events are defined using the Peaks-over-Threshold method • Annual time series of Hs (red line is storm threshold)

General

The Waverider was first deployed on 19 December 2006.

Acknowledgements

135

Annual Wave Report Minehead 2007

136

Annual Wave Report Minehead 2007

137

Annual Wave Report Minehead 2007

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Annual Wave Report Minehead 2007

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Annual Wave Report Minehead 2007

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