Estimation of erosion and sedimentation using EPM and geomorphology models in a semi-arid environment (case study: Qir, Karzin basin of Iran)

摘要

Karzin-Qir basin as Part of the central Fars region is considered to be the Zagros fold belt of Iran which follows the general trend of Zagros folds are northwest to southeast, And the sedimentary basins are limited to the anticlines and gutters of Fars province. In this paper, the aim is to estimate the erosion rate of the basin and estimate the amount of annual sedimentation and to determine the severity of erosion using geomorphological indicators and Erosion Potential Method (EPM) modeling. And sediment yield models in a GIS, with the primary data obtained from topographic maps, Landsat ETMC data, aerial photographic interpretation, field survey and earlier studies. The results showed that the combination of the above two methods provides a more appropriate estimate than determining the sedimentary erosion rate of the basin. And the calculation of EPM erosion rate of 515 m~3/Km~2.y, coefficient of sedimentation of the basin 0.47. and total sediment discharge rate in the basin was 242 m~3/Km~2.y. And total sediment discharge is 23232 m~3/y. Based on the method of scoring geomorphological factors total erosion rate of the basin was set at 442 m~3/Km~2.y.