Large Scale Groundwater Modelling

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The hydrological model LISFLOOD is a spatially-distributed, partially physically-based rainfall-runoff model that has been devised to simulate the hydrological behaviour in large European catchments, with emphasis on predicting floods and droughts. In the model the groundwater component is represented by two interconnected linear reservoirs, with the outflow in some unit of time being proportional to the volume of water stored in the reservoirs. Several studies have shown that this setup of the model is able to reproduce the observed hydrographs reasonably well, hence the model can be considered to be sufficiently detailed to predict high (floods) and low (droughts) flows.
However, LISFLOOD is not able to simulate the spatial distribution of groundwater levels and a comparison with groundwater observations is not possible. This document provides an overview on large-scale groundwater modelling techniques, and proposes possible ways to adapt LISFLOOD such that it can provide an estimate of the groundwater elevation in space and time.

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