Relationship Between Land Use Change And Amount Of Erosion And Sediment Production In Taleghan Watershed
2007
Ghoddousi, J., Asst. Pro. of Soil Conservation and Watershed Management Research Institute. Iran., | Feiznia, S., Professor of Tehran University, | Ahmadi, H., Professor of Tehran University, | Shabani, M., Scientific Staff of Azad Islamic University in Arsanjan. | Sarreshtehdari, A., Scientific Staff of Soil Conservation and Watershed Management Research Institute.
Accelerated erosion and sediment yield are effected by two groups of variable and invariable in time within a watershed. These variables contribute in occurrence of erosion and sediment production based on the existing environmental condition of a watershed. The results of studies on factors affecting erosion and sediment yield in watershed have showed that in most of watersheds, land use as a variable factor in time has more role and effect than the others. With this in mind, in order to assist the role of land use change in amount of erosion and sediment production the Taleghan watershed was selected as a study area. Using aerial photograph (e.g. 1970, 1987) and satellite image (e.g. 2001) interpretation along with field control present land use map of the area is prepared. Simultaneously, the amount of suspended load based on the observed data in three periods including 1970-1971, 1971-1987 and 1987-2001 were analyzed and calculated. then compression between estimated amount of erosion and sediment production by EPM (Erosion Potential Model), with the amount of the observed sediment production was made and related to land use change between three mentioned time periods. Results of this study show that apart from the occurrence of drought and wet years in the study area, land use change from rainfed agriculture to rangeland and vice versa are highly effects erosion and sediment rates in a watershed (decrease due to conversion of dry farms to rangelands and increased due to conversion of rangelands to dry farms). Thus it can be concluded that proper land use management can highlybe effect control of erosion and sediment yield in watershed areas.
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