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Model Inputs

HydroPol2D requires a combination of spatial datasets and tabular parameter files to define the simulation domain, physical properties, and boundary conditions.

The model is designed to work with raster-based inputs and structured configuration files, enabling flexible setup across a wide range of hydrological applications.

Required Inputs​

The following inputs are typically required to run a simulation:

1. Digital Elevation Model (DEM)​

The DEM defines the topography of the domain and controls:

  • Flow directions
  • Surface gradients
  • Watershed boundaries

High-resolution DEMs are recommended to accurately represent terrain-driven flow processes.

2. Land Use / Land Cover (LULC)​

The LULC map is used to assign spatially distributed parameters such as:

  • Manning’s roughness coefficient
  • Interception capacity
  • Impervious fraction

Each land use class must be linked to parameter values in the input tables.

3. Soil Properties​

Soil maps define hydraulic properties including:

  • Saturated hydraulic conductivity
  • Soil water retention characteristics
  • Infiltration capacity

These parameters control infiltration and subsurface flow dynamics.

4. Parameter Tables (Excel Files)​

HydroPol2D uses structured Excel files to define:

  • Land use parameters
  • Soil hydraulic parameters
  • Model configuration flags
  • Boundary conditions

These tables provide flexibility and allow users to modify model behavior without changing the source code.

Optional Inputs​

Depending on the simulation setup, additional inputs may be required:

Rainfall Data​

  • Lumped rainfall time series
  • Spatially distributed rainfall maps
  • Satellite-based rainfall products

Evapotranspiration (ETP)​

  • Time series inputs
  • Spatial raster maps

Inflow Hydrographs​

Used to define boundary inflows at specific locations.

Reservoir and Dam Data​

Required for:

  • Reservoir operations
  • Dam-break simulations

Water Quality Inputs​

For pollutant transport simulations:

  • Initial concentrations
  • Build-up and wash-off parameters

Data Preparation Guidelines​

To ensure consistent model performance:

  • All rasters must share the same spatial resolution and coordinate system
  • Missing values should be handled prior to simulation
  • Units must be consistent across all inputs
  • Domain boundaries should be clearly defined

Summary​

HydroPol2D relies on a structured combination of spatial and tabular inputs to represent hydrological processes in a physically consistent manner.

Proper preparation and validation of these inputs are critical for obtaining reliable simulation results.