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HHA 2015 Five Yearly Review Comparison of Lidar and Bathymetry Data Sets

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HHA 2015 Five Yearly Review Comparison of Lidar and Bathymetry Data Sets HHA 2015 Five Yearly Review Comparison of LiDAR and Bathymetry data sets DLM7531-RT001-R02-00 November 2017 HHA 2015 Five Yearly Review Comparison of LiDAR and Bathymetry data sets Document information Document permissions Confidential - client Project number DLM7531 Project name HHA 2015 Five Yearly Review Report title Comparison of LiDAR and Bathymetry data sets Report number RT001 Release number R02-00 Report date November 2017 Client Harwich Haven Authority Client representative John Brien Project manager Nigel Feates Project director Mike Dearnaley Document history Date Release Prepared Approved Authorised Notes 10 Nov 2017 02-00 NGF JS MPD 31 Aug 2017 01-00 NGF JS MPD Document authorisation Prepared Approved Authorised © HR Wallingford Ltd This report has been prepared for HR Wallingford’s client and not for any other person. Only our client should rely upon the contents of this report and any methods or results which are contained within it and then only for the purposes for which the report was originally prepared. We accept no liability for any loss or damage suffered by any person who has relied on the contents of this report, other than our client. This report may contain material or information obtained from other people. We accept no liability for any loss or damage suffered by any person, including our client, as a result of any error or inaccuracy in third party material or information which is included within this report. To the extent that this report contains information or material which is the output of general research it should not be relied upon by any person, including our client, for a specific purpose. If you are not HR Wallingford’s client and you wish to use the information or material in this report for a specific purpose, you should contact us for advice. DLM7531-RT001-R02-00 HHA 2015 Five Yearly Review Comparison of LiDAR and Bathymetry data sets Contents 1. Background _________________________________________________________ 1 2. Bathymetry and LiDAR data ____________________________________________ 1 3. Previously reported intertidal and subtidal volumes and areas__________________ 1 4. Analysis of LiDAR data ________________________________________________ 3 5. Analysis of bathymetry data ____________________________________________ 7 6. Combined LiDAR and bathymetry data____________________________________ 8 7. Analysis of intertidal and subtidal areas and volumes ________________________ 8 7.1. Comparison of 2005, 2010 and 2015 combined data sets .............................................................10 7.1.1. Orwell estuary....................................................................................................................10 7.1.2. Stour estuary......................................................................................................................15 8. Conclusions________________________________________________________ 20 9. References ________________________________________________________ 20 Figures Figure 4.1: Embayment areas and overview of erosion and accretion between +1 mCD and +4 mCD in the Orwell estuary between 2005 and 2015.............................................................................5 Figure 4.2: Embayment areas and overview of erosion and accretion between +1 mCD and +4 mCD in the Stour estuary between 2005 and 2015...............................................................................6 Figure 7.1: Overview of erosion and accretion patterns between 2005 and 2015 in the Orwell and Stour estuaries............................................................................................................................................9 Figure 7.2: Erosion and accretion patterns between 2005 and 2015 in Area 1 of the Orwell estuary .....11 Figure 7.3: Erosion and accretion patterns between 2005 and 2015 in Area 2 of the Orwell estuary .....12 Figure 7.4: Erosion and accretion patterns between 2005 and 2015 in Area 3 of the Orwell estuary .....13 Figure 7.5: Erosion and accretion patterns between 2005 and 2015 in Area 4 of the Orwell estuary .....14 Figure 7.6: Erosion and accretion patterns between 2005 and 2015 in Area 1 of the Stour estuary.......16 Figure 7.7: Erosion and accretion patterns between 2005 and 2015 in Area 2 of the Stour estuary.......17 Figure 7.8: Erosion and accretion patterns between 2005 and 2015 in Area 3 of the Stour estuary.......18 Figure 7.9: Erosion and accretion patterns between 2005 and 2015 in Area 4 of the Stour estuary.......19 Tables Table 3.1: Orwell estuary: Previously reported intertidal volume and area between 0 mCD and +4 mCD.......................................................................................................................................................2 Table 3.2: Orwell estuary: Previously reported subtidal volume and area below 0 mCD ..........................2 Table 3.3: Stour estuary: Previously reported intertidal volume and area between 0 mCD and +4 mCD.......................................................................................................................................................2 Table 3.4: Stour estuary: Previously reported subtidal volume and area below 0 mCD ............................2 Table 4.1: Orwell estuary: Summary of control point check results............................................................3 Table 4.2: Stour estuary: Summary of control point check results .............................................................4 Table 7.1: Orwell estuary intertidal volume and area between 0 mCD and +4 mCD...............................10 Table 7.2: Orwell estuary subtidal volume and area below 0 mCD..........................................................10 DLM7531-RT001-R02-00 HHA 2015 Five Yearly Review Comparison of LiDAR and Bathymetry data sets Table 7.3: Stour estuary intertidal volume and area between 0 mCD and +4 mCD ................................15 Table 7.4: Stour estuary subtidal volume and area below 0 mCD ...........................................................15 DLM7531-RT001-R02-00 HHA 2015 Five Yearly Review Comparison of LiDAR and Bathymetry data sets 1. Background HR Wallingford was commissioned to undertake a programme of activities for provision of input to the 2015 Harwich Haven Authority Five Yearly Review and Appendices. This activity, required the comparison of bathymetry and LiDAR data sets of the Stour and Orwell estuaries measured in 2005/2006, 2010/2011 and 2015/2016. Based on the results of the comparisons calculations of level, surface area and volume differences have been carried out. 2. Bathymetry and LiDAR data Bathymetric data provides a means to consider the spatial extent of the subtidal area of the estuaries. Knowledge of the subtidal area can be used to estimate the intertidal area based on the assumption that the total area of the estuaries are fixed by flood defences or rising ground. The bathymetric data typically extends up to a maximum of +2 m Chart Datum (CD). Hence the bathymetric data does not provide a direct means to analyse the full extent of changes over the intertidal area. Light Detection and Ranging (LiDAR) data provides full coverage of the upper intertidal but does not reliably cover the lowest part of the intertidal area (between approximately +1 mCD and CD). The LiDAR data can be reliably used to estimate the surface area and the changes in intertidal volume between about +1 mCD and +4 mCD. For the purpose of this study, the analyses of intertidal and subtidal volumes and areas has been undertaken based on a combined bathymetry and LiDAR surface of the Stour and Orwell estuaries. This analysis method was first adopted when comparing the 2005/2006 and the 2010/2011 bathymetry and LiDAR data sets (Royal Haskoning and HR Wallingford, 2011). The methodology adopted was to crop both the Orwell and Stour estuary bathymetry data sets at a level of +1 mCD. The bathymetry data could then be used to represent the estuaries below +1 mCD. The LiDAR data sets were cropped below +1 mCD and above +4 mCD. The LiDAR could then be used to represent the estuaries between the levels of +1 mCD and +4 mCD. The two data sets were then combined and uniform raster grids with 10 m spacing created. Where appropriate in the following sections of this report, the 2005/2006 combined data set is referred to as 2005, the 2010/2011 combined data as 2010 and the 2015/2016 combined data as 2015. 3. Previously reported intertidal and subtidal volumes and areas The previously reported (Royal Haskoning and HR Wallingford, 2011) intertidal and subtidal volumes and areas, calculated based on the combined 2005 and the 2010 bathymetry and LiDAR data sets, are shown Table 3.1 and Table 3.2 for the Orwell estuary and Table 3.3 and Table 3.4 for the Stour estuary. The figures for intertidal volume are a measure of sediment volume above a datum, so a negative number represents erosion of sediment. The figures for subtidal volume are a measure of sub-tidal water volume, so a negative number represents accretion of sediment. DLM7531-RT001-R02-00 1 HHA 2015 Five Yearly Review Comparison of LiDAR and Bathymetry data sets Table 3.1: Orwell estuary: Previously reported intertidal volume and area between 0 mCD and +4 mCD Volume change Year Planar area (m2) Area change (m2) Volume (m3) (m3) 2005 6,440,800 - 11,205,500 - 2010 6,535,920 95,120 gain 10,986,100 -219,400 erosion Source: Royal Haskoning and HR Wallingford (2011) Table 3.2: Orwell estuary: Previously reported subtidal volume and area below 0 mCD
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