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Using internal catchment information to reduce the uncertainty of discharge and baseflow predictions
Institution:1. Institute of Earth Sciences ‘Jaume Almera’, CSIC Lluis Solé Sabaris s/n, ES-08028 Barcelona, Spain;2. Institute for Pyrenean Ecology, CSIC. Avda. Montañana 1005, ES-50059 Zaragoza, Spain;3. Institute of Earth Sciences ‘Jaume Almera’, CSIC. Lluis Solé Sabaris s/n, ES-08028 Barcelona, Spain;4. Environmental Science/Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
Abstract:The semi-distributed hydrological model TOPMODEL was tested with data from the Can Vila research basin (Vallcebre) in order to verify its adequacy for simulating runoff and the relative contributions from saturated overland flow and groundwater flow. After a test of the overall performance of the model, only data from a wet period were selected for this work. The test was performed using the GLUE method. The model was conditioned on continuous discharge and water table records. Furthermore, point measurements of recession flow simultaneous with water table depth and the extent of saturated areas were used to condition the distributions of the more relevant parameters, using new or updated evaluation measures. A wide range of parameter sets provided acceptable results for flow simulation when the model was conditioned on flow data alone, and the uncertainty of prediction of the contribution from groundwater was extremely large. However, conditioning on water table records and the distribution of parameters obtained from point observations strongly reduced the uncertainty of predictions for both stream flow and groundwater contribution.
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