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Accueil du site → Doctorat → Royaume-Uni → 2000 → The effects of hillslope-channel coupling on catchment hydrological response in Mediterranean areas

King’s College London 2000

The effects of hillslope-channel coupling on catchment hydrological response in Mediterranean areas

Michaelides, Katerina

Titre : The effects of hillslope-channel coupling on catchment hydrological response in Mediterranean areas

Auteur : Michaelides, Katerina.

Université de soutenance : King’s College London (University of London)

Grade : Doctor of Philosophy (PhD) 2000

Résumé
The overall aim of this thesis is to investigate the effects that hillslope-channel coupling has on the hydrological response of Mediterranean catchments. Hillslope-channel coupling is defined here as the connectivity of the hydrologic and/or geomorphic processes between hillslopes and river channels. Coupling determines the effectiveness, direction and speed with which localized changes are transmitted away from the hillslope and propagated throughout the hillslope system to the channel and ultimately to the catchment outlet. Two numerical models were designed and developed to examine the effects of coupling on the hydrological response of cross sections, reaches and small catchments at the timescale of a single event. The main model is a two-dimensional, physically based, distributed model that explicitly accounts for the interactions between the hillslopes, floodplains and the channel in a dynamic way. An extensive sensitivity analysis of the numerical models was carried out in order to determine whether channel reaches with different coupling characteristics had significantly different sensitivities to parameter variations. Results show that for the same catchment area, reaches with different coupling characteristics produce significantly different hillslope hydrographs and total discharge at the reach outlet, and have significantly different sensitivities in the model. Hillslope-channel coupling was, however, shown to have less effect on the hydrological response as the magnitude of the rainfall event or flow event in the channel increased. The model was also tested against observed data from an extreme flood event that occurred in 1992 in the Ouvèze basin in SE France and was parameterized using field data. The results from the application show promise in using a coupling approach to understand flood events in semi-arid, Mediterranean catchments.Most importantly, the results from this thesis have indicated many other potential areas where a coupling approach would be invaluable to the understanding of the linkages and interactions between landscape elements

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Page publiée le 5 février 2015, mise à jour le 15 octobre 2018