WP-3 focuses on SWAT-based watershed analysis and tidal hydrodynamic modeling units. It provides critical insights into river flow dynamics, flood risks, and water availability for irrigation from surface sources.
Scientific Objectives
Model watershed dynamics using the SWAT (Soil and Water Assessment Tool) framework.
Simulate tidal hydrodynamics in coastal river channels to assess saline water intrusion.
Quantify surface water availability and seasonal flow variability across pilot basins.
Integrate hydrodynamic outputs into the WebAIS platform for flood and drought risk mapping.
Execution Framework
T1. Watershed Modeling (SWAT)
Setup and calibration of watershed-scale hydrological models.
- Delineation of pilot watersheds using high-resolution Digital Elevation Models (DEM).
- Compilation of land use, soil, and hydro-climatic data for SWAT parameterization.
- Calibration of streamflow simulations against historical gauging station records.
- Validation of water balance components (ET, surface runoff, baseflow).
T2. Hydrodynamic River Modeling
Simulating flow and salinity dynamics in large river networks.
- Development of 1D/2D hydrodynamic models for major river reaches.
- Integration of tidal boundary conditions for coastal estuary simulations.
- Modeling of sediment transport and channel morphodynamics in alluvial sections.
- Assessment of saline-water travel times and concentration gradients.
T3. Water Resources Assessment
Evaluating irrigation potential and flood hazard scenarios.
- Quantification of extractable surface water volumes under different exceedance probabilities.
- Simulation of climate change impacts on seasonal flow regimes (Boro vs. Aman seasons).
- Mapping of flood inundation extent and duration for historical and future events.
- Development of flow-duration curves for specific irrigation intake points.
Project Milestones
SWAT watershed models calibrated and validated for all primary pilot basins.
Hydrodynamic river reach models operational for coastal salinity tracking.
Integrated surface water availability maps published for institutional use.
Flood and drought risk indices integrated into the WebAIS dashboard.
