Desenvolupament d'un model hidrològic per incorporar informació del radar meteorològic. Aplicació operacional a la conca del riu Besós.

Año: 2003
Centro de realización: ETSECCPB
Centro de lectura: AULA MASTER,UPC
Resumen de la tesis

Floods are the most important natural hazard in the Mediterranean area. In spite of the efforts made in the Spanish state, and particularly in Catalunya region, in improving telemetered hydrological systems to monitor these risk situations (SAIH systems, weather radar networks), the application of a rainfall-runoff model to help decision making is still in a incipient phase. Moreover, the use of radar information inside a hydrological purpose is still doing the first steps. This thesis seeks to be a contribution in this sense, and with the aim that the model could be used in the water agencies, a rainfall-runoff model adapted to operational requirements is proposed, with enough elasticity to provide forecasts in different points over the catchment, and particularly conceived to take profit of weather radar information. It is a conceptual grid-distributed model, based on the division of the catchment in several smaller units (hydrological cells), where a spatially variable rainfall field is introduced. The Besòs catchment provides the data base to test the model, to see the limitations, to propose improvements and to evaluate the model under an operational perspective. In the first part of the thesis, and preceded by a state of art in flood hydrological modelling, the proposed hydrological model is described. The second part is focused on the analysis of the model in the Besòs catchment: the fit of the model obtaining the parameter set from comparison against observed discharges in different level gauges, and different improvements in the model structure are evaluated. The third part is devoted to the operational application of the model: first, the radar information is evaluated as an input to the hydrological model, and subsequently the operational experiences developed during this work are described. The results have shown that the model has a reasonable behaviour, although some improvements must be done in the future in order to be able to reliably reproduce the huge variety of situations in all the stations of a complex catchment like the Besòs. Some improvements in the model structure have produced some encouraging results, but more detailed work is required to achieve significant improvements. In relation to the use of radar information in flood simulation, it is shown that it has a big potential to provide improvements in hydrograph reproduction in Mediterranean catchments. It is also shown the need to incorporate a merging procedure with raingauge data, and the convenience of previously processing original radar data. The model has been implemented in the Besòs Flood Warning System (SAHBE) managed by CLABSA, and it is now being implemented in the ACA’s control centre. The experiences have been very positive, and an initial framework to use historical events analysing flood forecasts from the operational point of view has been carried out with this thesis. The rainfall-runoff model applied to the Besòs catchment is now a framework to test different advancements in hydrometeorology, in particular the radar correction procedures, the radar-raingauge merging methodologies, and the rainfall forecasts.
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