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Bridgwater Tidal Barrier Appraisal Hydraulic Modelling

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Bridgwater Tidal Barrier Appraisal Hydraulic Modelling REPORT Bridgwater Tidal Barrier Appraisal Hydraulic Modelling Prepared for Environment Agency November 2019 Rev: P03 Ref: ENVIMSW002039-CH2-FEV-SW-RP-HY-00105 CH2M HILL Burderop Park Swindon SN4 0QD 1 Contents Section Page Acronyms and Abbreviations ....................................................................................................... ix Background ................................................................................................................................. 1 1.1 Project need .................................................................................................................. 1 1.2 Purpose of report .......................................................................................................... 2 1.3 Objectives ..................................................................................................................... 3 1.4 Scope ............................................................................................................................. 3 Approach .................................................................................................................................... 5 2.1 Existing models ............................................................................................................. 6 2.2 Model updates .............................................................................................................. 8 2.2.1 Downstream extension .................................................................................... 8 2.2.2 Improvement works......................................................................................... 9 2.2.3 2D Floodplain ................................................................................................. 10 2.3 Model verification ....................................................................................................... 13 2.4 Model sensitivity ......................................................................................................... 13 Verification of model revisions .................................................................................................. 14 3.1 Winter 2013-14 tidal event ......................................................................................... 14 3.1.1 Boundary conditions ...................................................................................... 14 3.1.2 Results ............................................................................................................ 14 3.1.3 Discussion ...................................................................................................... 20 3.2 Spring tide 2015 .......................................................................................................... 26 3.2.1 Boundary conditions ...................................................................................... 26 3.2.2 Results ............................................................................................................ 27 3.2.3 Discussion ...................................................................................................... 27 3.3 Summary ..................................................................................................................... 30 Design model boundary conditions ............................................................................................ 32 4.1 Fluvial flow .................................................................................................................. 32 4.1.1 River Parrett upstream of Bridgwater ........................................................... 32 4.1.2 River Parrett downstream of Bridgwater ...................................................... 34 4.1.3 Model fluvial boundaries ............................................................................... 34 4.2 Tidal water level .......................................................................................................... 36 4.2.1 Model tidal boundary .................................................................................... 36 4.2.2 Model tide curves .......................................................................................... 37 Model simulations .................................................................................................................... 42 5.1 Baseline flood risk ....................................................................................................... 42 5.1.1 Simulations .................................................................................................... 42 5.1.2 Results ............................................................................................................ 42 5.1.3 Sensitivity test results .................................................................................... 49 5.2 Flood damages ............................................................................................................ 54 5.2.1 Simulations .................................................................................................... 54 5.2.2 Results ............................................................................................................ 56 5.3 Barrier closure ............................................................................................................. 65 5.3.1 Closure rules .................................................................................................. 67 5.3.2 Simulations .................................................................................................... 68 5.3.3 Results ............................................................................................................ 70 5.4 King's Sedgemoor Drain operation ............................................................................. 80 5.5 Fluvial flood management .......................................................................................... 80 iii 5.5.1 Simulations .................................................................................................... 80 5.5.2 Results ............................................................................................................ 80 5.6 Barrier failure .............................................................................................................. 84 5.6.1 Simulations .................................................................................................... 84 5.6.2 Results ............................................................................................................ 85 5.7 Adaptation Pathways .................................................................................................. 87 Appendices Appendix A Barrier Closure Rules Tables Table 1. Model 2D Domain Roughness Values Table 2. Extreme tide level estimates at km334 in 2008 (Coastal flood boundary conditions 2011) Table 3. Allowances applied in model boundary tide curves for increase in relative sea level between 2008 and future epochs Table 4. Maximum tidal boundary water levels for baseline model simulations Table 5. Modelled water levels in Bridgwater (2024 and 2055) Table 6. Approximate variations in overbank flow in model sensitivity tests Table 7. Approximate variations in overbank flow in model sensitivity tests Table 8. Maximum tidal boundary water levels for flood damage model simulations Table 9. Design simulation scenarios for barrier location No. 5 Table 10. Maximum tidal boundary water levels for barrier design model simulations Table 11. Effect of barrier closure at location No. 5 on discharges from King's Sedgemoor Drain Table 12. Effect of barrier closure on flow in River Parrett at Northmoor Pump Station (locations No. 4 and 5) Table 13. Effect of barrier closure on discharge from Northmoor Pump Station (locations No. 4 and 5) Figures Figure 1 Location of Bridgwater, River Parrett and the project area Figure 2 Summary of approach to model revisions Figure 3 SLM model schematisation downstream of the M5 motorway Figure 4 Schematisation of downstream model extension Figure 5 Location of Cannington Bends Flood Defence Scheme Figure 6 Location of Northmoor Pump Station to Linden Farm Dredging Figure 7 Extent of 2D model domain Figure 8 Water level gauges in the Parrett estuary Figure 9 Model water levels and gauge data – Winter 2013-14 tidal event (Dunball) Figure 10 Model water levels and gauge data – Winter 2013-14 tidal event (West Quay) Figure 11 Model water levels and gauge data – Winter 2013-14 tidal event (Northmoor) Figure 12 Model water levels and gauge data – Winter 2013-14 tidal event (Saltmoor) Figure 13 Model water levels and gauge data – 3 January 2014 (West Quay) Figure 14 Model water levels for sensitivity tests (timestep and boundary interpolation) – 3 January 2014 (West Quay) Figure 15 Model high water levels and gauge high water levels at West Quay (1 December 2013 to 31 January 2014) Figure 16 Model water level and gauge data – 18 December 2013 (West Quay) Figure 17 Model water level and gauge data – 18 December 2013 (Dunball) Figure 18 Model water levels and gauge data – 3 January 2014 (West Quay) – effect of fluvial flow Figure 19 Model water levels and gauge data – 3 January 2014 (West Quay) – effect of channel roughness Figure 20 Model water surface profiles downstream of West Quay at low water Figure 21 River Parrett channel downstream of West Quay gauge Figure 22 Model water levels for sensitivity tests (timestep and boundary interpolation) – 3 January 2014
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