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DSD-INT 2022 Development of a proactive water management system for Bangkok - Hutten

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DSD-INT 2022 Development of a proactive water management system for Bangkok - Hutten

  1. 1. Rinske Hutten (Deltares), On behalf of PANYA consultants and Deltares Via scripting generated 1D2D urban (sewer and surface water) models 15 November 2022 Development of a proactive water management system for Bangkok
  2. 2. Outline 2 • Introduction to the project • Approach • Challenges • Modelling approach • Modelling cycle • Proactive Water Management System • Conclusions • Next steps Delft3D User Days 2022
  3. 3. About Bangkok Some facts & figures about Bangkok: • Capital of Thailand • Inhabitants: 8 – 15 million people • Rainfall: ~1500 mm/year • Situated at the: − Downstream stretch of the Chao Phraya river − Coast of Gulf of Thailand 3 Delft3D User Days 2022
  4. 4. About the drainage system Some facts & figures about the drainage system: • > 2000 km of main pipes • > 1500 main drainage canals (length: > 2500 km) • > 190 pumping stations • ~ 250 regular gates • 4 large scale drainage tunnels (+ 6 planned) • Divided over 38 sub-polders 4 Delft3D User Days 2022
  5. 5. About the floods
  6. 6. About the project 6 Initiated and owned by the Bangkok Metropolitan Administration, The goal of the project is “Setting up a functioning Proactive Water Management System for the Bangkok Metropolitan Authority (BMA)” Executed by, & Delft3D User Days 2022
  7. 7. Approach 7 • Develop a Delft-FEWS application to be used for flood forecasting in Bangkok • Develop a flood model based on Delft3D FM for the metropolitan area in Bangkok • Incorporate the flood model in Delft-FEWS • Build-up local capacity Delft-FEWS Delft3D FM 1D2D Delft3D User Days 2022
  8. 8. Challenges in the project (I) 8 Complex Size of the area m2 Computational speed GIS database Data availability Model calibration Working on distance Delft3D User Days 2022
  9. 9. Challenges in the project (II) 9 GIS database Delft3D User Days 2022
  10. 10. Challenges in the project (II) 10 How did we cope with these challenges? Delft3D User Days 2022
  11. 11. Modelling approach (I) 11 m2 Delft3D User Days 2022
  12. 12. Modelling approach (II) 12 Detail models RR D-RTC 1d (canals & drainage tunnels) Bangkok model – main model m2 Delft3D User Days 2022
  13. 13. Bangkok model 13 m2 Delft3D User Days 2022
  14. 14. Drainage tunnels in Bangkok model 14 m2 Delft3D User Days 2022
  15. 15. Bangkok model versus detail model 15 m2 Delft3D User Days 2022
  16. 16. 2D grid only for big streets in detail model 16 Delft3D User Days 2022
  17. 17. Modelling cycle 17 Build and run the model Analyse results Identify missing or incorrect data Improve data m2 Delft3D User Days 2022
  18. 18. Automated model generation via scripts (I) 18 • GIS data is collected and validated by PANYA. • The model generation is automized via Python scripts. • The scripts use some functionalities of D-HyDAMO: a Dutch model converter created to convert for the HyDAMO database of waterboards • The automatic model generation is structured according to the HydroMT model API GIS data storage Delft3D FM 1D2D models Script Delft3D User Days 2022
  19. 19. Automated model generation via scripts (II) 19 • Includes.: − 1D sewers coupled with surface water (channels and rivers), and a 2D grid − Rainfall Runoff NWRW concept, − Automatic generation of 1D boundaries, − Structures and storage nodes, − Determination of sub-catchments via Thiessen-polygon (within the catchments of the real drainage system area), − Logging of the model building process − Validation plots Delft3D User Days 2022
  20. 20. Analysis of model results 20 Delft3D User Days 2022
  21. 21. Identification of missing and incorrect data 21 • The validation plots generated during the model building help with the identification of e.g. non-connected network elements. & Delft3D User Days 2022
  22. 22. Further automatization in the project 22 In addition to the automatization of model generation, the following steps were automatized: • Integration of Delft3D FM 1D2D models in Delft-FEWS • Semi-automatic model calibration & Python Snakemake = Delft3D User Days 2022
  23. 23. Proactive Water Management System: Database 23 • Based on Delft-FEWS software • Installed as client-server system at PANYA and BMA • Database consist of all time series received from Bangkok: − Observed telemetry data (from 2012) − Observed radar data (from August 2021) − Precipitation radar now cast (from August 2021) − NWP prediction (from August 2021) • Time series are used for: − Analysis data quality − Historical flood scenarios(model calibration) Delft3D User Days 2022
  24. 24. Proactive Water Management System: Bangkok model 24 1D water levels Delft3D User Days 2022
  25. 25. Proactive Water Management System: detail models 25 2D water depths Delft3D User Days 2022
  26. 26. Proactive Water Management System: planning 26 Models runs every 4 hours with a prediction horizon of 8 hours Triggered by crossing rainfall thresholds Delft3D User Days 2022
  27. 27. Proactive Water Management System: End Users 27 • PANYA retrieves measurements and model simulations from the FEWS database via Delft-FEWS API. • For example, maps with observed water levels and rainfall predictions are exported. • These are used in the following applications: Delft3D User Days 2022
  28. 28. Conclusions 28 • Automatic model generation was challenging but needed to achieve full coverage over such a large area and to cope with the growing database. • Urban flood modelling remains very complex and good local data and information remains crucial. • We applied Delft3D FM Suite 1D2D for the first time on this scale in an operational setting, with success! • By training our local partner, we contribute to the capacity building needed to improve flood forecasting in Thailand. • The project taught us many insights on how to best model a large urban water management system in Delft3D FM Suite 1D2D. Delft3D User Days 2022
  29. 29. Next steps 29 • Model quality and –speed are dependent on the GIS database. Further improvement of GIS database is therefore needed. • Implementation of Real-Time Control at the important gates in the Bangkok model. Delft3D User Days 2022
  30. 30. Contact rinske.hutten@deltares.nl

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