Simulation on ungauged catchments based on upstream/downstream discharges assimilation within lumped model
Résumé
This paper introduces a novel approach to assimilate in a simple way the information provided by upstream or downstream flow measurements to simulate discharges on ungauged catchments. The simulations are based on a combination of a simple routing model to propagate an upstream or downstream hydrograph from a gauged site towards an ungauged location and a lumped rainfall-runoff model to generate the runoff on the intermediary basin between the two sites. This technique is an original alternative to the regionalisation of models parameters and permits to exploit efficiently the information provided by nearby gauged time-series. This approach is applied on a large set of 126 French catchments. For each site considered as ungauged, several upstream/downstream gauged sites are selected, the combined model is then applied and results are compared with the real observed data.