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University of Exeter (2002)

An investigation of soil salinization in Al-Hassa Oasis, Saudi Arabia

Al-Zokair, Abdulaziz A.

Titre : An investigation of soil salinization in Al-Hassa Oasis, Saudi Arabia

Auteur : Al-Zokair, Abdulaziz A.

Université de soutenance : University of Exeter

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

Résumé
Despite all the efforts of the Saudi Arabian government to reclaim the lost land, the problem of soil salinization is still persistent in Al-Hassa oasis. Since 1970, not only have efforts to reclaim land lost to salinization failed, but many natural springs have dried up. Therefore, saline water is increasingly being utilised for irrigation, which, in turn, increases the salinity of the soil in the oasis. Before steps can be taken to reduce this trend and increase the productivity of Al-Hassa oasis, it is necessary to study the spatial distribution of soil salinity in the area, as well as determine possible remedies based on prior and current studies of soil and water salinization. The research methods employed in the writing of this thesis include the use of the comparative and descriptive method, wherein past studies are compared with recent studies to illustrated the effects of physical and human factors on the spread and distribution of soil salinization. Also used is the so-called digital image analysis approach. In this method, Landsat 5-TM images of Al-Hassa oasis are used to illustrate the current classification, severity and spatial distribution of soil salinity. The purpose of this study is to delineate the spatial distribution of soil salinity in Al-Hassa oasis utilising the Remote Sensing method. This study represents the first systematic investigation of the extent and severity of salinization in Al-Hassa oasis using Remote Sensing techniques. Due to the abundance of vegetation cover in Al-Hassa oasis, different Remote Sensing techniques were used, such as visual interpretation of the TM False Colour Composite (FCC), 3, 2, 1 band combination, 4, 3, 2 band combination, NDVI tasselled cap, and PCA 1, 2, 3 band combination. Also, a regression model approach was used which delineated soil salinity in the oasis into two categories : highly salt-affected area and moderately salt-affected area. Processed data from Landsat Thematic Mapper band 4 produced reasonable estimates of the extent of salinity. In the concluding chapter, a general finding concerning the analysis of Landsat images is presented.

Mots clés : Date palms Soil science Geography Agricultural engineering Soil science Geography Agricultural engineering

Présentation : EThOS (UK)

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