M4 – Hydraulic model: irrigation-groundwater interaction

Partner: RWTH-IWW in cooperation with UAF and PMIU

Objective
In order to investigate the interaction of irrigation channels with groundwater, a groundwater flow model of the Rechna Doab is set up in DHI-FEFLOW as well as a 1D surface water flow model of the rivers and irrigation channels in SOBEK. These two models are coupled using the OpenMI standard and a proprietary coupling interface between Feflow and OpenMI, developed by RWTH-IWW.

Current Results
As of December 2017 we have successfully set up the SOBEK model for surface water, the FEFLOW model for groundwater flow as well as the coupling of both models. More than 16000 links exchange data on hydraulic head, channel water levels and seepage rates at every time step during runtime and in both directions. A sensitivity analysis of different parameters was performed to better understand the behavior of the model.

Expected Outcome
The models will continuously be updated and refined as new and more precise data becomes available from field surveys or from models of project partners. Our next steps will be model calibration and verification. Later on we will then look into modeling different future scenarios in close cooperation with other project partners.