Calibration strategies for a groundwater model in a highly dynamic alpine floodplain
By: L. Foglia, P. Burlando, Mary C. Hill, and S. Mehl
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Abstract
Most surface flows to the 20-km-long Maggia Valley in Southern Switzerland are impounded and the valley is being investigated to determine environmental flow requirements. The aim of the investigation is the devel-opment of a modelling framework that simulates the dynamics of the ground-water, hydrologic, and ecologic systems. Because of the multi-scale nature of the modelling framework, large-scale models are first developed to provide the boundary conditions for more detailed models of reaches that are of eco-logical importance. We describe here the initial (large-scale) groundwa-ter/surface water model and its calibration in relation to initial and boundary conditions. A MODFLOW-2000 model was constructed to simulate the inter-action of groundwater and surface water and was developed parsimoniously to avoid modelling artefacts and parameter inconsistencies. Model calibration includes two steady-state conditions, with and without recharge to the aquifer from the adjoining hillslopes. Parameters are defined to represent areal re-charge, hydraulic conductivity of the aquifer (up to 5 classes), and streambed hydraulic conductivity. Model performance was investigated following two system representation. The first representation assumed unknown flow input at the northern end of the groundwater domain and unknown lateral inflow. The second representation used simulations of the lateral flow obtained by means of a raster-based, physically oriented and continuous in time rainfall-runoff (R-R) model. Results based on these two representations are compared and discussed.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Calibration strategies for a groundwater model in a highly dynamic alpine floodplain |
| Year Published | 2004 |
| Language | English |
| Contributing office(s) | Office of Ground Water |
| Description | 4 p. |
| First page | 1 |
| Last page | 4 |
| Conference Title | International Conference on Finite-Element Models, MODFLOW, and More 2004 |
| Conference Location | Karlovy Vary, Czech Republic |
| Conference Date | September 13-16 |
| Google Analytic Metrics | Metrics page |