Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : ENVIRONMENTAL GROUNDWATER ASSESSMENT IN THE WADI KHULAYS BASIN,WESTERN PROVINCE, SAUDI ARABIA

التقيم البيئي للمياه الجوفية بحوض وادي خليص

Auteur : Bardi, Wail Abdulaziz

Université de soutenance : King Abdulaziz University

Grade : Master 2013

Résumé
The aim of the present study is to evaluate the environmental impact on the quality and quantity of the groundwater in two major sub-basins namely Murawani and Ghiran sub-basins of Wadi Khulays in the western part of Saudi Arabia. The present study indicated that several factors operated individually and/ or collectively on groundwater quality and quantity development. These factors were classified into the following (1) Chemical weathering of silicate minerals ; (2) Dissolution and precipitation of evaporitic salts as a result of recycling of irrigation water and recharging by surface water runoff and recycling of irrigation water that carried evaporate salts which precipitated as calcite, dolomite and halite as the saturation indices indicate to be existed ; (3) Possible groundwater contaminant by sewage water within Wadi Ghiran sub-basin as observed from elevated nitrate concentrations as well as from the relationship between NO3 and Cl ; (4) Climatic changes that observed from the trend of rainfall amounts over the drainage basin area ; and (5) The nature of drainage pattern and morphometric characteristics of the two sub-basins since the wadi Ghiran is almost less tributaries and characterized by short main channels comparing to the Wadi Marawani sub-basin which is caused, the surface water leave the Wadi Ghiran fastly which almost decreases the amount of natural recharging from floods that generated in the wadi which considered the major source of recharging water of the alluvial aquifer existed. The chemical data, field measurements and saturation indices of evaporitic minerals were treated by using multivariate analysis (Factor analysis) to find out the major factors have affected groundwater chemistry.

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