Evaluating the Effects of Run off on Khadijeh Khatoun Basin Using MPSIAC Model

Unfortunately, in recent decade, due to land use change and vegetation cover degradation, most of the rainfall changed into run off and causes abundant loss of life and property by creating enormous floods. The purpose of this evaluation was to study the run off impacts on the erosion of the catchment area using the MPSIAC model.

For this purpose, the basic information and maps of the Khadijeh Khatoon basin in 2018 such as topographic and geology maps were collected. Then the calculation steps of nine model factors including surface geology or metrology, soil, climate, run off, topography, land cover, land use, current erosion and river erosion, and erosion and Sediment is estimated. Finally, the relationship between runoff and erosion of the basin was determined and the model of erosion and sediment estimation from runoff was determined.

The results of this study showed that the amount of soil erosion is equal to 5806.97 tons per year and is 3.58 tons per hectare per year. If the value of one ton of agricultural land is equal to 50 US dollars and if the condition of erosion is available, the value of 5806.97 tons per year is equal to 290348.5 US dollars, which is equal to 11613.9 million Rials. The MPSIAC's seventh and eighth factor basins are the most effective factors.

This conclusion suggests that pastures around Khadijeh Khatoun are not well-conditioned due to over-capacity utilization, and the whole of the region's pastures due to climatic conditions. Also, the results showed that the runoff factor had a linear correlation of 0.98 with erosion, which indicates that the higher the runoff, the increase in the amount of erosion and deposition.