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Accueil du site → Doctorat → Royaume-Uni → 2002 → Development of computer aided design for the effective design of micro-catchments in arid climates

University of Southampton (2002)

Development of computer aided design for the effective design of micro-catchments in arid climates

Noura, Nader

Titre : Development of computer aided design for the effective design of micro-catchments in arid climates

Auteur : Noura, Nader

Université de soutenance : University of Southampton

Grade : Doctor of Philosophy (Ph.D.) : 2002

In and regions, where water-harvesting techniques can be applied to use surface runoff for agricultural production, long term meteorological records of data are often scarce. micro-Cachment systems have attracted significant developments in design and operation of water delivery in and climate areas. In contrast, advances in exploiting the potential of methods to conserve water and increase crop yield by accurate control of rain water and moisture regime through the soil were made at a much slower pace. An attempt is made to model and calculate actual runoff water received in infiltration basins from runoff areas based on changes in rainfall intensity, infiltration, size and slope of a Micro-Catchment system. A soil moisture simulation model is developed, relating to fundamental physical principles, to provide the necessary data for evaluating the potential success of rainfed agriculture in infiltration basins. The model considers infiltration, evaporation, redistribution, and water uptake by plant roots. Based on a survey of existing techniques and their limitations, a generalised water balance model is proposed as a tool to analyse the performance of the system, and to locate problems in the water harvesting process. The combined models are interpreted numerically by finite difference methods and a number of numerical techniques are developed to treat time-dependent, none linear and moving boundary conditions. When tested by comparison with analytical solutions and field experiments that have been published in recent literature, the results were favourable. The proposed water balance model is used to obtain an insight into the generation of actual runoff, the dynamics of moisture movement in the root zone and to examine the role of crop water demands in controlling the size of Micro-Catchment systems. The numerical investigation has significance implications on micro-Cachment system design and estimates of actual evapotranspiration and water use (yield relations). The application of the proposed model to practical problems in the present study, demonstrates its usefulness as a viable alternative to expensive experimental set-ups. Aided by the model, methods of moisture regime control in arid climates are examined to seek optimum utilisation of scarce water resources in Micro-Catchment systems.

Mots clés : Water harvesting Computer-aided design Agricultural engineering Computer-aided design Agricultural engineering

Présentation (IranDoc)

Accès au document : Proquest Dissertations & Theses

Page publiée le 4 juin 2009, mise à jour le 16 janvier 2018