Les apports d'un S.I.G. dans la connaissance des évolutions de l'occupation du sol et de la limitation du risque érosif dans la plaine de la Bekaa (Liban) : exemple d'un secteur du Bekaa el Gharbi

Abstract : The Bekaa Valley, our study site, has undergone a significant land-cover evolution over the last fiftyyears (urban vegetation cover). This evolution has prompted us to seek the causes of soil coverchange (climatic and socio- economic factors, etc.). The Geographical Information System (GIS)allows conducting an objective study in an area where direct on-site observations are not always easy.In our study, we compare two different periods (1962 to 1998). We study the risk factors that couldthreaten this agricultural region. The risk of hydric erosion (erodibility and crusting soil) is a majorcause of soil degradation threatening the future of agriculture in the Bekaa Valley and the study area.Several factors are associated with hydric erosion hazard, most of which like the soil, slope of thearea, and geology maintain a constant value while soil cover and rainfall may vary from year to year.For this, we worked on the vegetation cover, given its importance for ensuring productive agriculturewhich helps protect the soil against hydric erosion. This led us to establish several optimization mapsof land-use according to the map of land suitability in an area which lacks agricultural guidance, andto study erosion sensitivity tailored to each optimization map, in order to be able to choose the mostsuitable mechanism of land development to protect the environment, taking into account the socioeconomicfactors of the study site.
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Hussein El Hage Hassan. Les apports d'un S.I.G. dans la connaissance des évolutions de l'occupation du sol et de la limitation du risque érosif dans la plaine de la Bekaa (Liban) : exemple d'un secteur du Bekaa el Gharbi. Géographie. Université d'Orléans, 2011. Français. ⟨NNT : 2011ORLE1113⟩. ⟨tel-00647147⟩

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