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Accueil du site → Doctorat → États-Unis → 1985 → PRECIPITATION DISTRIBUTION IN THE SOUTHWEST OF SAUDI ARABIA

Arizona State University (1985)

PRECIPITATION DISTRIBUTION IN THE SOUTHWEST OF SAUDI ARABIA

ALEHAIDEB, IBRAHIM SOLIAMAN

Titre : PRECIPITATION DISTRIBUTION IN THE SOUTHWEST OF SAUDI ARABIA

Auteur : ALEHAIDEB, IBRAHIM SOLIAMAN

Université de soutenance : Arizona State University

Grade : Doctor of Philosophy (PhD) 1985

Résumé
The objective of this study was to determine the relationship between precipitation and elevation and topography in the Southwest of Saudi Arabia. Involved was identification of levels of maximum precipitation, spatial and temporal distribution of precipitation, and the effect of regional topography, elevation, and orientation of the mountains to this relationship. The general relationship between precipitation and elevation and topography in the Southwest of Saudi Arabia was determined. Mean precipitation for 10 years was used to determine the objectives of this study. Precipitation generally increases with increased elevation as most studies illustrate. The precipitation-elevation relationship is affected by regional topographic and synoptic climatic conditions. The point of maximum precipitation varies from place to place and from time to time. Accurate measurement of precipitation in mountainous areas is difficult because of the differentiation in weather phenomena and processes which occur in short distances. Regression analysis was used to examine if there was a relationship between precipitation and elevation, to determine the relative effects of topography and the orientation of the mountains on this relationship. The isohyetal technique was employed to draw maps of the mean and median seasonal and annual precipitation in the Southwest of Saudi Arabia. Harmonic analysis was employed to determine temporal and spatial distribution of precipitation in the study area. The study suggests that the amount of precipitation in the Southwest of Saudi Arabia varies from one season to another, and there is a relationship between mean precipitation and elevation and the topography of the region. The maximum amount of precipitation does not fall at the higher elevation stations in the region and the elevational level for the maximum varies from season to season. The results of the study will have theoretical and practical significance. They explain the interrelationships between precipitation and topography and meteorological factors in the Southwest of Saudi Arabia and should be useful for weather prediction, agriculture, hydrology, planning, road construction, and rural settlement development.

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Page publiée le 28 février 2015, mise à jour le 1er novembre 2019