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DSD-INT 2019 Lake Eutrophication Modelling with Delft3D Suite, Wuhan City, China - Liao

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Presentation by Qingtao Liao, Ewaters Shanghai Ltd, China, at the Delft3D - User Days (Day 4: Water quality and ecology), during Delft Software Days - Edition 2019. Thursday, 14 November 2019, Delft.

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DSD-INT 2019 Lake Eutrophication Modelling with Delft3D Suite, Wuhan City, China - Liao

  1. 1. Ewaters Lake Eutrophication Modelling with Delft3D Suite, Wuhan City, China Aaron Liao, Ewaters Environment Science&Technology(Shanghai)Ltd. With Help from Arjen Markus, Erik de Goede, Deltares 14,Nov,2019 1
  2. 2. Ewaters Presentation Overview 03 Model Evaluation 04 01 Future Plan Model Building Introduction 2 02
  3. 3. Ewaters 01 Introduction 3
  4. 4. Ewaters 1- Introduction 4 7 River Basins in China Lakes in central urban area 4 Water Systems in Wuhan 40 Lakes in Central Urban Area
  5. 5. Ewaters Ⅰ,II or Ⅲ 25,0% Ⅳ or Ⅴ 58,9% water quality survey in 2018比 1- Introduction Parameters (mg/L) Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ COD 15 15 20 30 40 TP 0.01 0.025 0.05 0.1 0.2 TN 0.20 0.50 1.00 1.50 2.00 NH3-N 0.15 0.50 1.00 1.50 2.00 Better Worse Worse than Ⅴ 16.1% 5 70%30% By 2020 I,II or III Worse than Ⅲ 75%25% By 2030 I,II or III Worse than Ⅲ Environment Quality Standards of Surface water
  6. 6. Ewaters 1- Introduction 6 • Subcatchments Area:184.6km2 • Lake Area: 47.62 km2 • Water depth: about 2.2m Characteristic of Tangxun Lake
  7. 7. Ewaters 1- Introduction 7 From 2018, the Water Quality of the Tangxun Lake is Worse than V By 2025, the Target of Water Quality is ≥ III Water Quality of Tangxun Lake
  8. 8. Ewaters 02 Model Building 8
  9. 9. Ewaters 2-Model Building——Structure of the Model 9 1D Model 1D Hydraulic Model 1D WQ Model Evaluation Data collection Aerial Map Monitoring Data Pipe Network Data Meteorological Data Data processing Delft3D FM Hydrodynamic model Model Calibration Hydrodynamic simulation analysis Delft3D FM Water Quality model Model calibration Water Quality Simulation analysis Quick Plot Matlab DEM… Delft3D FM Suite 2019.04 HMWQ (1.5.4.45038) InfoWorks ICM V9.0
  10. 10. Ewaters
  11. 11. Ewaters 2-Model Building -1D Model Setting 11 Type Area km2 Percentage % Roof 53.4 28.9% Green 68.8 37.3% Impervious 28.8 15.6% Bare land 15.8 8.6% Road 17.7 9.6% Total 184.6 100% Underlying Analysis
  12. 12. Ewaters 2-Model Building—— 1D Model Setting 12 12 channels More than 600 drainage outfalls 151 outfalls in 1D Model 2 pump stations sewage treatment plant Model Simplification
  13. 13. Ewaters 2-Model Building——1D Model Setting Hydraulic Result Water Quality Result Delft3D FM 2D Model1D Model
  14. 14. Ewaters 3-Model Building——Delft3D FM Model Setting Mesh generation Model building Boundary conditions Wind speed and direction Rainfall and Evaporation Discharges • Meteorological boundaries • Water flow from 151 outfalls and 2 Plants • Pollution loads from 151 outfalls and 2 Plants • Bed level,30m×30m • Hydraulic structures • Outlet • Resolution 80m • About 17,000 cells 14
  15. 15. Ewaters • Water Quality Monitoring 8 sites at the exit of port canals 6 sites inside the lake 60+ sampling sites at the exit of the outfalls • Water level Monitoring 6 sites inside the lake • Rainfall Monitoring 7 sites inside the catchment • Others 68 Sediment monitoring point 15 Water Quality monitoring sites in chanel Water Quality monitoring sites in Lake Water level monitoring sites Rainfall monitoring sites 3-Model Building——Delft3D FM Model Setting
  16. 16. Ewaters16 3-Model Building——Delft3D FM Model Setting 17.6 17.7 17.8 17.9 18 18.1 18.2 18.3 18.4 18.5 18.6 18.7 18.8 18.9 19 19.1 2018/5/1 2018/6/10 2018/7/20 2018/8/29 2018/10/8 2018/11/17 2018/12/27 2019/2/5 2019/3/17 2019/4/26 WaterLevel(m) Yulingdao Park Measured water level Simulated water level Yulongndao Park Verification 17.4 17.6 17.8 18 18.2 18.4 18.6 18.8 19 19.2 19.4 2018/5/1 2018/6/10 2018/7/20 2018/8/29 2018/10/8 2018/11/17 2018/12/27 2019/2/5 2019/3/17 2019/4/26 WaterLevel(m) Tangxun Lake village Measured water level Simulated water level Tangxun Lake village
  17. 17. Ewaters 03 Model Evaluation 17
  18. 18. Ewaters 3 Model Evaluation——Case1 Current Situation Evaluation Flood season 2018.06.29~2018.07.04 Non flood season 2019.03.06~2019.03.11 Hydraulic model 0.01m/s 510-3m/s 18
  19. 19. Ewaters 3 Model Evaluation——Case1 Current Situation Evaluation Non-flood season 20180310 12:00 Flood season 20180701 12:00 COD TP NH3-N TN 19
  20. 20. Ewaters CSO control& Sponge city project Water treatment system improvingRiver connecting project 3-Evaluation——Case2 Evaluation of the Water Environment Master Plan 20 Water Environment MasterPlan of Tangxun Lake Basin Water diversion project Water with better quality
  21. 21. Ewaters 3-Evaluation- Case2 Evaluation of the Water Environment Master Plan Non-flood season Flood season 21 Before improvement After improvement
  22. 22. Ewaters 3-Evaluation -Case2 Evaluation of the Water Environment Master Plan AfterBefore AfterBefore Non-flood season Flood season COD AfterBefore AfterBefore Non-flood season Flood season TP 22 COD TP
  23. 23. Ewaters 3-Evaluation -Case2 Evaluation of the Water Environment Master Plan NH3-N AfterBefore AfterBefore Non-flood season Flood season AfterBefore AfterBefore Non-flood season Flood season TN 23 NH3-N TN
  24. 24. Ewaters 3-Evaluation—— Case3 Water Quality Forecasting ◆ Simulated Time : 2019.09.01~2019.11.30 ◆ Boundary conditions: Section Boundary data Existing 2019.09.01~2019.09.30 monitoring data Forcasting 2019.10.01~2019.11.30 Based on two typical year • 2012——more rainfall • 2018——less rainfall 0 10 20 30 40 50 60 2019/9/1 2019/9/11 2019/9/21 2019/10/1 2019/10/11 2019/10/21 2019/10/31 2019/11/10 2019/11/20 2019/11/30 降雨(mm) 2012 rainfall 0 5 10 15 20 25 30 2019/9/1 2019/9/11 2019/9/21 2019/10/1 2019/10/11 2019/10/21 2019/10/31 2019/11/10 2019/11/20 2019/11/30 降雨(mm) 2018 rainfall ◆ Diversion works Diversion works was stopped since 2019.09.13 ◆ Pollutant reduction One sewage treatment plant was stopped since 2019.09.13 24
  25. 25. Ewaters 3-Evaluation——Case3 Water Quality Forecasting Based on 2012 Based on 2018 TN simulation results 25
  26. 26. Ewaters 3-Evaluation——Case3 Water Quality Forecasting Based on 2012 Based on 2018 26 TP simulation results
  27. 27. Ewaters 04 Future Plan 27
  28. 28. Ewaters 4 Future Plan 28 1D Model Delft3D FM model Delft-FEWS • Data processing resultsData Medel Evaluation Display:data and simulation results Data quality assessment Ensemble Forecasting Completed To be completed Data collection Aerial Map Monitoring Data Pipe Network Data Meteorological Data DEM…
  29. 29. Ewaters 4- Future Plan • Channels & Structures 22 (bridge and culverts, dikes, weirs) 29 2 10-1 11 7 2 10-1 7 11
  30. 30. Ewaters THANK YOU! Aaron Liao Qingtao.liao@ewaters.biz www.ewaters.bizKnow more about us at 30

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