Documentation / Tutorials

J2K: Transform Daily into Hourly Model

Overview

To convert a standard daily J2K hydrological model to hourly resolution, implement these modifications:

Required Changes

1. Time Series Input

   Convert all time series data to hourly time steps

2. Model Time Step

   Modify the general time step setting in the main J2K context

3. Component Parameters

   Search for tempRes across all components and change from daily (d) to hourly (h)

4. Time-Dependent Parameters

   Soil Module (J2KProcessLumpedSoilWater):

   • Maximum percolation speed (e.g., 20mm/d → 0.83mm/h)
   • Maximum infiltration rate for summer/winter (mm/d → mm/h)
   • Test results carefully for overland flow and interflow generation

   Groundwater Module (J2KProcessGroundwater):

   • RG1/RG2 outflow coefficient (10d → 240h)

5. Precipitation Elevation Correction

   Set elevationCorrection parameter to “false” in HRULoop/regionalization/precipRegionalization module

6. Unit Conversion

   Change from L/d to L/h in the unit conversion module

7. Efficiency Calculator

   Modify unit parameter from daily (d) to hourly (h)