Regional soil erosion risk mapping in Lebanon |
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| Authors: | Rania Bou Kheir Olivier Cerdan Chadi Abdallah |
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| Institution: | aLebanese National Council for Scientific Research/Remote Sensing Center, P.O. Box: 11-8281, Beirut, Lebanon;bBRGM, B.P. 6009, 3 avenue Claude Guillemin, 45060 Orléans, France |
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| Abstract: | Soil erosion by water is one of the major causes of land degradation in Lebanon. The problem has not yet been treated in detail although it affects vast areas. This study elaborates a model for mapping soil erosion risk in a representative area of Lebanon at a scale of 1:100,000 using a spatial database and GIS. First, three basic maps were derived: (1) runoff potential obtained from mean annual precipitation, soil-water retention capacity and soil/rock infiltration capacity; (2) landscape sensitivity based on vegetal cover, drainage density and slope; and (3) erodibility of rock and soil. Then two thematic maps were derived: potential sensitivity to erosion obtained from the runoff potential and landscape sensitivity maps, and erosion risk based on the potential erosion and erodibility maps. The risk map corresponds well to field observations on the occurrence of rills and gullies. The model used seems to be applicable to other areas of Lebanon, constituting a tool for soil conservation planning and sustainable management. |
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| Keywords: | Water– soil erosion Erosion modelling Land degradation GIS Risk assessment Lebanon |
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