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Abstract of the Article

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A Study of Erodibility and Sedimentation in Dez Dam Basin

Authors:
[ Farzad Nazarizadeh ] - Ms.C. of soil science- khouzestan water and power authority
[ Ebrahim Zallaghi ] - Ms.C. of irrigation- khouzestan water and power authority
[ Farhad Izadjoo ] - Ph.D. of irrigation- khouzestan water and power authority

Abstract:

Due to severe scarcity of water resources in Iran, protection of available water resources has long been a major concern and thus studying erosion and sediment as influential factors in decreasing useful storage of the reservoirs is of profound importance. In the present study, erosion potentials and sedimentation in Dez dam basin were investigated. This basin is located in 50ο,21/to 48ο,10/E and 34ο,7/to 32ο,36/N, and its total area is 17320 Km. This research was conducted using PSIAC model also RS and GIS techniques were used in order to reduce time, costs and potential risks of the field operations. The final score as a sum of 9 parametric values in MPSIAC model across the basin was at maximum 147. Based on the prepared map, almost 35% of the basin was determined as erodable areas with high sedimentation risks. The value of Qs in primary estimate as per the de-sedimentation equation was equal to 17247245 in the basin. This estimation was compared and calibrated by using the measured sediment at the Dam. In order to perform calibration, the above figure was divided over the annual sediment of the dam i.e. 15.3 MMC 3 . The amount of sediment produced in the basin was determined as 15742800 m 3 per year considering a correction coefficient of 0.88607. This value was implemented in the primary sedimentation map in a GIS environment and then the result as the final version of sedimentation map was produced using MPSIAC model.

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