Journal Papers
Cartographie de l’utilisation du sol et de l’érosion nette àpartir d’images satellitaires et du SIG Idrisi au Nord-Est du Maroc
Published：2008-11-01
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Abstract:
In this investigation, we utilize remote sensing data (four Landsat and Spot images were analyzed for a fifteen year period: 1987 - 2002) and a GIS for the quantitative evaluation as well as developing the spatial patterns of erosion and deposition within the Oued Tlata basin (123 km2) located in north-east of Morocco. This contribution’s primary objective is to integrate RUSLE’s output data into a flow model (sedimentation) to access the net soil erosion and to identify priority areas (zones of high soil loss or deposition) for possible interventions to curtail and ameliorate land degradation. Analysis of these satellite data allowed the identification of six main land cover types (highly degraded lands, cereal (annual) crops fields, mixed farmlands, olive trees, reforested areas, and natural protected forest). After the determination of the areal distribution of each land type for each date, soil losses were estimated through the incorporation of a developed RUSLE (Revised Universal Soil Loss Equation) module in the framework of Idrisi GIS. These static estimates of soil loss were then utilized in a newly developed sedimentation algorithm that models the down slope movement of the soil loss. These spatial (flow) movements were then evaluated to determine net erosion and deposition within the river basin for each time period. The patterns of soil loss and deposition over the duration of the study period show a relation to both the changing land cover and the land facets found within the river basin. The consideration of the erosion and deposition phenomenon at the same time in the study of the soil degradation process represents the originality of this work.
Key words:
Erosion; Deposition; Remote sensing; Oued Tlata; Morocco;
Reference:
Aarouani, A. El, H. Chen, and L. A. Lewis, A. Tribak and M. Abahrour. 2008. Cartographie de l’utilisation du sol et de l’érosion nette àpartir d’images satellitaires et du SIG Idrisi au Nord-Est du Maroc. Revue Télédétection. 8(3): 193-201.
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