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University of Birmingham (2006)

Hydrogeological assessment of the Haddat ash Sham Region, North East of Jeddah, Saudi Arabia

Al-Amri, N. S

Titre : Hydrogeological assessment of the Haddat ash Sham Region, North East of Jeddah, Saudi Arabia

Auteur : Al-Amri, N. S

Université de soutenance : University of Birmingham

Grade : Doctor of Philosophy (PhD) 2006

Résumé
This thesis describes an investigation into the development and application of modelling tools to quantify available water resources in a typically arid region in the western part of Saudi Arabia. Three models have been used in this assessment : UNSAT Model to provide details of soil water behaviour on both the wadi bed forms and the irrigated areas ; WADI Model to provide the distribution of recharge from the wadi flows, and MODFLOW Model to integrate water balance components derived from the other models with the regional geological data, pumping patterns for domestic consumption and agricultural irrigation. The study has permitted the development of a range of field, laboratory and modelling techniques and has improved the hydrological understanding of the Haddat ash Sham basin. The following thesis demonstrates the value of modelling for the prediction of the water balance in arid region groundwater systems, where data are relatively scarce and the heterogeneity, in space and time, of the inflows to the system are minimal. Several interesting results have been concluded from the research that can be used to guide future study in this field and to assist in the development of managerial plans for basins similar to the Haddat ash Sham basin. The recharge from the wadi system has been shown to be a substantial component of the overall water balance in the area. A surprisingly high return flow from the irrigation applications has also been found. The lateral flows from the deep, less permeable aquifer units are influential in controlling the decline of groundwater resources in the area. The final groundwater model provides a useful starting point for future groundwater development in the area. The techniques applied in the present study are applicable to similar aquifer systems both in Saudi Arabia and elsewhere.

Accès au document : Proquest Dissertations & Theses

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