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Kyoto University (2010)

Hydrological Approaches of Wadi System Considering Flash Floods in Arid Regions

Mohamed Saber Mohamed Sayed Ahmed

Titre : Hydrological Approaches of Wadi System Considering Flash Floods in Arid Regions

Auteur : Mohamed Saber Mohamed Sayed Ahmed

Université de soutenance : Kyoto University

Grade : Doctor Thesis 2010

Présentation

With regard to the aforementioned problems of arid and semi-arid regions, the main objectives of this study are : (1) To develop a physically-based distributed hydrological model to overcome the prescribed struggles for wadi runoff and flash floods simulation, (2) to propose a homogenization method of upscaling hydrological parameters related to a distributed runoff model from microscopic aspects up to macroscopic ones. The essential idea of homogenization is to average inhomogeneous media in some way in order to capture global properties of the medium, (3) To present a consistency of empirical and physical methodology to estimate the initial and transmission loss in wadi basins, throughout the empirical approaches with the physical approaches have been connected to develop a new methodology for this purpose, (4) To evaluate the initial and transmission losses and their effect on both surface and subsurface water due to their importance in the hydrological processes in the arid regions, (5) To understand distributed wadi runoff behaviors in space and time throughout a comparative study between some Arabian wadi basins. The comparison between such wadi basins is focusing on the effect of topographical conditions of the catchments, the difference of degree of urbanization, the difference of basin’s scales or shapes, the difference of total amounts of rainfall or rainfall duration in the upstream and mountainous areas, the difference of soil permeability on the river channels, and the difference of runoff features in wadi basins, (6) To simulate flash floods using Satellite Remote Sensing Data to overcome the paucity of data in such regions and to protect the human life and their properties from flash floods devastating effect, (7) To assess and evaluate the contribution of wadi basins to the Nile River which is representing the main water resource for Egypt and the other sharing countries. In some extend, flash flood water could be managed as useful new water resources.

Mots clés : wadi system hydrological approach flash floods arid regions transmission losses homogenizetion theory Egypt the Nile River

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Page publiée le 5 décembre 2011, mise à jour le 19 avril 2020