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Westshore Reef Surf Conditions WESTSHORE REEF SURF CONDITIONS Predicted effects from the proposed Whakarire Ave Breakwater April 2008 Suite 3, 17 Nobs Line, New Plymouth, New Zealand T: 64-6-7585035 E: [email protected] Whakarire Ave Breakwater - Surf Effects Status Version Date Status Approved By: RevA 15/11/2007 Draft for review Beamsley RevB 27/11/2007 Updated draft McComb RevC 12/03/2008 Updated draft McComb RevO 03/04/2008 Approved for release McComb It is the responsibility of the reader to verify the currency of the version number of this report. The information, including the intellectual property, contained in this report is confidential and proprietary to MetOcean Solutions Ltd. It may be used by the persons to whom it is provided for the stated purpose for which it is provided, and must not be imparted to any third person without the prior written approval of MetOcean Solutions Ltd. MetOcean Solutions Ltd reserves all legal rights and remedies in relation to any infringement of its rights in respect of its confidential information. © MetOcean Solutions Ltd 2008 MetOcean Solutions Ltd ii Whakarire Ave Breakwater - Surf Effects TABLE OF CONTENTS 1 INTRODCUTION ........................................................................................... 1 1.1 BACKGROUND ............................................................................................ 1 1.2 SCOPE AND STRUCTURE .............................................................................. 3 1.3 SUMMARY OF SURFING WAVE PARAMETERS ................................................. 4 1.3.1 Breaking wave height......................................................................... 4 1.3.2 Wave peel angle................................................................................. 4 1.3.3 Wave breaking intensity..................................................................... 5 1.3.4 Wave section length........................................................................... 5 1.3.5 Surfability.......................................................................................... 5 2 STUDY METHODS ........................................................................................ 7 2.1 BATHYMETRY SOURCES .............................................................................. 7 2.2 WAVE HINDCAST MODELLING ..................................................................... 8 2.2.1 Numerical model................................................................................ 8 2.2.2 Model domains................................................................................... 8 2.2.3 Boundary conditions .......................................................................... 9 2.2.4 Winds................................................................................................. 9 2.2.5 Model output...................................................................................... 9 2.3 NEARSHORE WAVE MODEL ....................................................................... 11 2.4 REFLECTIVITY .......................................................................................... 16 2.5 SURFABILITY ............................................................................................ 18 3 RESULTS ...................................................................................................... 19 3.1 WAVE HINDCAST VALIDATION ................................................................... 19 3.2 WAVE CLIMATE ........................................................................................ 22 3.2.1 Surfability........................................................................................ 26 3.3 EXISTING SURF BREAK FUNCTIONALITY ..................................................... 26 3.4 BREAKWATER EFFECTS ON SURF QUALITY ................................................. 30 3.5 SHELTERING EFFECTS ................................................................................ 48 3.6 SIMULATION OF THE JUNE 2007 SURF EVENT ............................................. 50 4 SUMMARY ................................................................................................... 56 5 REFERENCES .............................................................................................. 59 MetOcean Solutions Ltd iii Whakarire Ave Breakwater - Surf Effects TABLE OF FIGURES Figure 1.1 Coastal protection structures proposed by BECA................................ 2 Figure 1.2 Coastal protection structures proposed by BECA, including the detached breakwater (island) offshore of Westshore Beach................. 2 Figure 1.3 Location of the The Reef surf break (also known as Perfume Point). The proposed seawall / breakwater is also shown on this image.......... 3 Figure 1.4 Wave-rose’ depicting the effects of wind strength (knots) and direction on surfing waves (modified from Walker, 1997)................................. 6 Figure 2.1 Coverage of the nearshore bathymetry survey..................................... 7 Figure 2.2 Swan numerical model domain extents for New Zealand (A), Hawke’s Bay (B) and Napier (C). Also show is the location of the Port of Napier, Bluff Hill and the hindcast output locations within the Napier domain. ............................................................................................ 10 Figure 2.3 Existing bathymetry near Whakarire Ave and Westshore Beach, Napier............................................................................................... 12 Figure 2.4 Proposed breakwater option.............................................................. 13 Figure 2.5 Proposed breakwater plus island option ............................................ 13 Figure 2.6 Alternate breakwater rotated............................................................. 14 Figure 2.7 V-shaped breakwater........................................................................ 14 Figure 2.8 Alternative V-shaped breakwater...................................................... 15 Figure 2.9 CGWAVE model output transect locations....................................... 15 Figure 2.10 Comparison of data on rock-armoured slopes with reflection formulae. The two rough fit slopes reflect the work of Postma (1989) and the prediction by Seelig and Ahrens (1981), after (CIRIC, CUR and CETMEF, 2007)............................................................................... 17 Figure 3.1 Comparison between measured and hindcast significant wave heights at the waverider buoy site (VBWR1 on Fig. 2.1)............................... 21 Figure 3.2 The effect of different offshore wave periods (A), directions (B) and tide elevations (C) on the wave height along the surfers path for the existing bathymetry. See Figure 2.9 for transect locations................. 28 Figure 3.3 Wave height and crests patterns for a 1 m (A) and 2 m (B) incident wave at The Reef.............................................................................. 29 Figure 3.4 Polar plot of spectral wave boundary condition (JONSWAP, with Hs = 1 m, Tp = 12 s, and gamma 3). .......................................................... 29 Figure 3.5 Wave height distributions and wave crest patterns for a 1 m spectral wave simulation, showing the energy peak (Tp=12s) with a 0.4 breakwater reflection coefficient. A – Existing, B – proposed breakwater case. The lower image is a close up of the nearshore wave crest patterns..................................................................................... 32 Figure 3.6 Wave height distributions and wave crest patterns for a 1 m spectral wave simulation, showing the energy peak (Tp=12s) with a 0.4 breakwater reflection coefficient. A – Existing, B – rotated breakwater case. The lower image is a close up of the nearshore wave crest patterns............................................................................................. 33 Figure 3.7 Wave height distributions and wave crest patterns for a 1 m spectral wave simulation, showing the energy peak (Tp=12s) with a 0.4 breakwater reflection coefficient. A – Existing, B – V-shaped breakwater. The lower image is a close up of the nearshore wave crest patterns............................................................................................. 34 MetOcean Solutions Ltd iv Whakarire Ave Breakwater - Surf Effects Figure 3.8 Wave height distributions and wave crest patterns for a 1 m spectral wave simulation, showing the energy peak (Tp=12s) with a 0.4 breakwater reflection coefficient. A – Existing, B – alternative V- shaped breakwater. The lower image is a close up of the nearshore wave crest patterns............................................................................ 35 Figure 3.9 Modelled wave heights along the approximate surfer’s path at mid-tide level (Hs=1m, Tp=12s)..................................................................... 36 Figure 3.10 Wave surface plot of the energy peak for original breakwater option at mid-tide with zero reflectivity (A), 0.4 reflectivity (B) and 0.8 reflectivity (C).................................................................................. 37 Figure 3.11 Spectral output locations along the approximate surfers path; SP1 is offshore and SP4 is inshore............................................................... 38 Figure 3.12 Directional spectra for locations shown on Figure 3.9. Existing case, with Hs=1m and Tp=12s. The 2D scale is spectral density and the radial scale is frequency (0-1). .......................................................... 39 Figure 3.13 Directional
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