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iMOD is an easy-to-use Graphical User Interface with Deltares' innovative version of MODFLOW (called iMODFLOW). Both iMOD and iMODFLOW are freely available here: https://oss.deltares.nl/web/imod

iMOD Adapter

This page describes the iMOD module adapter, its functions, and provides an example for configuring an iMOD run in Delft-FEWS.

The iMOD Adapter is a Python script designed to make running iMODFLOW models from Delft-FEWS as easy as possible. This includes not only iMODFLOW, but also the coupled MetaSWAP and WOFOST models, as described below. It builds on the iMOD Python package found at https://gitlab.com/deltares/imod-python and uses the iMOD RUNFILE batch function to create run files from project files.

iMODFLOW

MODFLOW is a popular open-source groundwater flow model distributed by the U.S. Geological Survey. iMODFLOW is characterized by fast, flexible and consistent high resolution and sub-domain modelling techniques. It enables very large, high resolution groundwater modelling. Results include the groundwater heads of the various aquifers.

MetaSWAP

MetaSWAP can model both shallow and deep groundwater levels; it is intended for regions with an undulating topography and unconsolidated sediments. Its strength lies in modelling the unsaturated zone and shallow subsurface. MetaSWAP covers plant-atmosphere interactions and groundwater. Results include the fluxes to and from the unsaturated zone.

WOFOST

WOrld FOod STudies (WOFOST) is a crop growth model for the quantitative analysis of the growth and production of annual field crops. WOFOST can be used to calculate attainable crop production, biomass, water use, etc. for a given location. Calculations are made based on local soil type, crop type, weather data, and crop management factors (e.g. sowing date). Results include the root zone depth, leaf area index, and water demand.

iMODFLOW-MetaSWAP-WOFOST coupling

The coupled iMODFLOW-MetaSWAP-WOFOST model benefits from the strengths of each model: iMODFLOW for the groundwater flow, MetaSWAP for the unsaturated zone, and WOFOST for the crop growth aspect. A schema of hte fluxes between the models is provided in Figure 1.

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Figure 1. iMODFLOW-MetaSWAP-WOFOST coupling.

Adapter installation instructions

The adapter is a Python package and requires Python 3.6 or higher. A number of packages need to be installed prior to installing the adapter. This can be done by using a file called "environment.yml" as follows:

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