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University of Durham (1995)

Water erosion on the northern slope of Al-Jabal Al-Akhdar of Libya

Ali, Gebril Motawil

Titre : Water erosion on the northern slope of Al-Jabal Al-Akhdar of Libya.

Auteur : Ali, Gebril Motawil.

Université de soutenance : University of Durham

Grade : Doctor of Philosophy (Ph.D.) : 1995

The northern slope of Al-Jabal Al-Akhdar, due to the relatively high amount of rain it receives and the good soils it has in some locations, is considered a reliable area for rain-fed farming. However, in this area, man has greatly altered the vulnerable environment and increased erosion rates. Water erosion is becoming a serious problem as a result of removing the natural vegetation cover to expand the agricultural area in order to fulfil the demand of local markets for agricultural products.This study therefore examines the importance of the different erosion factors of climate, topography, soil, vegetation cover and land use in accelerating soil erosion in the study area in order to find suitable solutions to this problem. The different factors, listed above, wee first studied in relation to the presence and intensity of the soil erosion features, and then their relations to the rates of soil loss were analysed. Based on these relations, proper conservation measures were suggested. Data used have been obtained from fieldwork survey and existing reports, maps and statistics on soil, vegetation, agriculture and rainfall.The results indicate that the soils of this area are generally shallow, contain a high percent of clay and low amounts of organic matter. Consequently, these soils have a low infiltration rate and poor storage capacity. The variability of rainfall and its occurrence as relatively heavy showers characterized by high intensity, coupled with the poor soil properties, can produce runoff. The removal of natural vegetation and its replacement with a plant cover providing less protection for the land surface greatly increases the rate of runoff leading to accelerated soil erosion


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