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Accueil du site → Master → Espagne → Estimación de pérdidas de cauce, modelización de transporte de sedimentos y cambio climático de una cuenca mediterránea (Rambla de la Viuda)

Universitat Politècnica de València (2017)

Estimación de pérdidas de cauce, modelización de transporte de sedimentos y cambio climático de una cuenca mediterránea (Rambla de la Viuda)

Montalvo Montenegro, Carlos Israel

Titre : Estimación de pérdidas de cauce, modelización de transporte de sedimentos y cambio climático de una cuenca mediterránea (Rambla de la Viuda)

Estimation of water losses in the riverbed, sediment modelling and climate change in a mediterranean basin (Rambla de la viuda)

Auteur : Montalvo Montenegro, Carlos Israel

Université de soutenance : Universitat Politècnica de València

Grade : Máster Universitario en Ingeniería Hidráulica y Medio Ambiente 2017

Résumé partiel
¿Rambla¿ is a Spanish term used for rivers which only present water flow a few days per year. That is the case with most Spanish rivers. These are characterized by an ephemeral water flow in the riverbed. This is related to Spain¿s unique weather, with a seasonal temperatures regime similar to a temperate climate regime, and the aridity and low rainfall typical of dry climate ; and its lithology dominated by karst that hinders the connection between river and aquifer and also enables favors water infiltration from riverbed. For this project, the conceptual distributed model TETIS has been implemented on the ¿Rambla de la Viuda¿ basin to assess the distinctive features of this kind of basins. Based on a previous implementation of the said basin model, the work sought to estimate the water losses. This was done for the purpose of trying to obtain a better hydrological representation in order to jointly model the sediment cycle . And finally, the work tried to estimate the effects of Climate Change on the watershed. Water transmission losses have been estimated using spatial information related with the process, such as maps of the karstic zones inside the basin and of the relationship between surface and groundwater flow. These maps have been used to detect the areas affected by the phenomenon. Its magnitude was related with its area according to methodologies previously applied by various authors. The magnitude was estimated taking into account the three different kinds of phenomena : areas inside karstic zones, river sections with indirect connection between surface-groundwater and the combined case. The results show 8 m3/s global losses distributed around 6.5 Km2 of the riverbed area. The introduction of the distributed water losses into the model increases its performance qualitatively evaluating the hydrograph and in quantitatively evaluating the Nash¿Sutcliffe model efficiency coefficient. The modeling of the sediment cycle was performed using information about the Ma. Cristina dam storage capacity losses related with the sediment accumulation. Information from different years was used to estimate the sediment storage. This was calculated as the difference between the older and the newer measure. The variation over time caused by the consolidation effect was taken into account. The volume of sediment obtained was used to calibrate the TETIS sediment submodel getting as result a simulated sedimentogram for the catchment

Mots Clés  : Hydrological modeling , Losses in the Riverbed , Sediments transport , Climate Change , TETIS , Modelización hidrológica , Pérdidas en Cauce , Transporte de sedimentos , Cambio Climático , Modelació hidrológica , Perdues de Llit , Transport de sediments , Canvi Climátic

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Page publiée le 23 février 2020