تخمين ميزان فرسايش آبي و توليد رسوب به روش MPSIAC در حوضه ي آبخيز علي آباد چادگان از زير حوضه هاي سد زايندرود با بهره گيري از سامانه اطلاعات جغرافيايي

Estimating the rate of erosion and producing sediment in watershed of " Aliabad,Chadegan"

Increasing process of the rate of erosion and producing sediment in the watershed areas of the country and in different features, estimating and defining of the rate of erosion and also the reason of increasing and its aggravation in areas were necessarily made. Using and applying the available methods, estimating of the erosion in unstatistical sediment areas, regarding to the experiences of using them in the parts of the country and in the world, can at least solve such problems at rate of time, on this basis estimating the rate of erosion and producing sediment in watershed of "Aliabad,CHadegan" in "Esfahan province" and under catchments of watershed of "Zayandeh rood" dam, were mentioned according to "GIS" technique and making use of "MPSIAC" method .In this study with making use of "GIS" ability with desert spread surveys and use of maps and other available information sources and also making necessary testing trying to estimate the 9 factors of "MPSIAC" whole area of "Aliabad" and also 7 sub basin of study were made. In continuation for defining the rate of erosion and sediment in sub basins the available relations in this connection were used. Results showed that the spreadest erosion types in whole area, type 6 and 7 have 23.4 and 12.7 square kilometers, in ease of management of the water and soil sources 3 factors were sub basins made with priority turbidity, producing sediment and coefficient of sediment so sub basins "S2"and "S211" by producing sediment of 7.5 and 7.4 thousands of ton per year have the most sedimentary rate, at the end for recognition the most important factors referring to changingʹs of amount grades of 9 factors of "MPSIAC" among the sub basins for statistical analysis of factor analysis and then cluster analysis for grouping the sub basins. The results of statistical analysis showed that the most important factor affected in explaining the changingʹs among "MPSIAC" factors are land use, surface geology, land cover and soil. Maps related with spreading of erosion types in area are presented with the other connected maps.