Abstract
In most of the basins, due to the lack of sedimentation stations, there is no accurate information on sediment deposition and soil erosion. In such basins, empirical models are used to estimate the sediment rate. At the basin scale, the applicability of these models is troublesome. The objectives of this study were to determine the erosion status of the Zarivar lake basin and to evaluate the efficiency of the Factorial Scoring Model, FSM, in estimating the sediment rate. Physiological and hydrological characteristics of 10 sub-basins of Zarivar lake were obtained using field measurements and aerial data in the GIS environment. The specific weight of the sediments was calculated in the laboratory and used to determine the weight of sediments. The sediment rate in sub-basins was measured in situ. Furthermore, by determining the effective parameters, the sediment rate for each sub-basin was obtained using FSM, and the results were compared with the measured rate. For the whole basin, the average, minimum, and maximum rate of observed sediment were 0.28, 0.007, and 1.17 m3/ha.yr, respectively. However, these rates were obtained by FSM as 103.70, 20.90, and 365 m3/ha.yr, respectively, which differed from the observed values. Based on the results, the model is not sufficiently efficient to evaluate the sediment rate in the studied sub-basins.
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