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Accueil du site → Doctorat → États-Unis → 1984 → AN ANALYSIS OF THE MOVEMENT OF WIND-BLOWN SAND AND ITS RELATION TO LAND-USE PRACTICES IN THE COACHELLA VALLEY DURING THE PAST TWENTY-FIVE YEARS (CALIFORNIA)

University of California, Riverside (1984)

AN ANALYSIS OF THE MOVEMENT OF WIND-BLOWN SAND AND ITS RELATION TO LAND-USE PRACTICES IN THE COACHELLA VALLEY DURING THE PAST TWENTY-FIVE YEARS (CALIFORNIA)

EL-AGHEL, ASSEDDIGH MOHAMED

Titre : AN ANALYSIS OF THE MOVEMENT OF WIND-BLOWN SAND AND ITS RELATION TO LAND-USE PRACTICES IN THE COACHELLA VALLEY DURING THE PAST TWENTY-FIVE YEARS (CALIFORNIA)

Auteur : EL-AGHEL, ASSEDDIGH MOHAMED

Université de soutenance : University of California, Riverside

Grade : Doctor of Philosophy (PhD) 1984

Résumé
The combination of a favorable climate and available water resources has resulted in a significant expansion of the agricultural, recreational, and urban land use in the upper Coachella Valley, California, since the beginning of the present century. This growth has been especially rapid during the past two and one-half decades. Similar developments are occurring in other arid and semi-arid areas of the world. Environmental problems associated with these events are of concern everywhere they occur. With the recent rapid conversion of land to new uses, detailed studies become indispensable to the understanding of the relationships between natural forces and environmental alteration attendant on changes in land use. Only then can the resources of arid areas such as the Coachella Valley be utilized with minimum damage to human artifacts and the environment. The present study describes the nature, extent, and direction of land use change in Coachella Valley during the past twenty three years and how these changes have been affected by and have affected problems of the wind-blown sand that characterizes large parts of the valley. From this analysis several trends in land use and in methods of coping with wind-blown sand become manifest that should be useful for future planning in the study area and that have application to arid areas elsewhere. Because wind speed, direction, and duration are closely related to the initiation of sand movement, hourly wind observations, for one year, have been analyzed for the Palm Springs station. Also, temperature and precipitation for three different stations have been analyzed for the perion 1971-1980 and compared with climatic averages normals for the period 1930-1960. Land use maps were prepared using U.S. Geological Survey topographic sheets and 1979 high-altitude color aerial photographs. These maps were then checked on the ground and modified during field work conducted between January and August, 1983. The corrected maps were then compared with land use maps of the areas prepared by the United States Army Corps of Engineers in 1961. A set of maps was then constructed showing the expansion of land use in the Coachella Valley after 1961. . .

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