Abstract
The purpose of this study was to obtain the regional model of erosion according to the specific climatic, adaptive, and other conditions of the Toroq watershed located in the east north of Khorasan Razavi province. To conduct this research, first, the homogeneous units were prepared using slope maps, lithology, land use, and erosion forms in a Geographic Information System environment. Then, to optimize the number of homogeneous units, the cluster analysis method was used in Statistical Product and Service Solutions (SPSS) software. The diagnostic analysis confirmed the accuracy of cluster analysis inhomogeneous regions. Field operations were carried out in homogeneous units with the establishment of a rainfall simulator and also the application of 30-min rainfall intensity with a return period of 10 years. Also, the collected soil samples were analyzed in the laboratory. After performing statistical analyses in the SPSS environment, the variables affecting erosion were determined and prioritized. Then, through the use of multivariate linear regression and step-by-step and interpolation methods, the equations for estimating the amount of erosion were determined. Finally, the multivariate linear model of plot erosion was prepared using the step-by-step method using two variables of plot slope and land use. The model was selected for estimating erosion after examining different validation methods based on less RE and less RMSE, higher R, low significance coefficient (Sig < 0.05), and also fewer inputs.
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Farajzadeh, S., Khaleghi, M.R. Evaluation of the efficiency of the rainfall simulator to achieve a regional model of erosion (case study: Toroq watershed in the east north of Iran). Acta Geophys. 68, 1477–1488 (2020). https://doi.org/10.1007/s11600-020-00487-0
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DOI: https://doi.org/10.1007/s11600-020-00487-0