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Mirchooli, F., Sadeghi, S., Khaledi Darvishan, A. (2022). Comparative analysis of the effect of different algorithms for calculating the topographic factor on the amount and spatial distribution of soil erosion in the Shazand Watershed, Iran. , 14(2), 232-242. doi: 10.22092/ijwmse.2021.341236.1753
Fahimeh Mirchooli; Seyed Hamidreza Sadeghi; Abdulvahed Khaledi Darvishan. "Comparative analysis of the effect of different algorithms for calculating the topographic factor on the amount and spatial distribution of soil erosion in the Shazand Watershed, Iran". , 14, 2, 2022, 232-242. doi: 10.22092/ijwmse.2021.341236.1753
Mirchooli, F., Sadeghi, S., Khaledi Darvishan, A. (2022). 'Comparative analysis of the effect of different algorithms for calculating the topographic factor on the amount and spatial distribution of soil erosion in the Shazand Watershed, Iran', , 14(2), pp. 232-242. doi: 10.22092/ijwmse.2021.341236.1753
Mirchooli, F., Sadeghi, S., Khaledi Darvishan, A. Comparative analysis of the effect of different algorithms for calculating the topographic factor on the amount and spatial distribution of soil erosion in the Shazand Watershed, Iran. , 2022; 14(2): 232-242. doi: 10.22092/ijwmse.2021.341236.1753

Comparative analysis of the effect of different algorithms for calculating the topographic factor on the amount and spatial distribution of soil erosion in the Shazand Watershed, Iran

مهندسی و مدیریت آبخیز
Article 8, Volume 14, Issue 2, July 2022, Pages 232-242    PDF (2.17 M)
Document Type: Research Paper
DOI: 10.22092/ijwmse.2021.341236.1753
Authors
Fahimeh Mirchooli1; Seyed Hamidreza Sadeghi* 2; Abdulvahed Khaledi Darvishan3
1PhD,, Faculty of Natural Resources and Marine Science, Tarbiat Modares University, Iran
2Professor, Department of Watershed Management Engineering, Faculty of Natural Resources and Marine Science, Tarbiat Modares University, Iran
3Associate Professor, Department of Watershed Management Engineering, Faculty of Natural Resources and Marine Science, Tarbiat Modares University
Abstract
Soil erosion is an important subject in water and soil conservation researches which is influenced by natural and anthropogenic factors. Hence, knowledge on soil erosion amount enables the identification of critical areas and prioritization of measures. One of the effective factors in the evaluation of soil erosion is slope and length (LS) which could be calculated using different methods and algorithms, so the selection of the best method to provide proper estimation is important. However, the comparison of the performance of the different estimation methods has not been sufficiently considered. Therefore, the present study was conducted to calculate the LS factor and evaluate its effect on estimations of soil erosion in the Shazand Watershed using four common algorithms viz. Renard et al. (1997); Desmet and Govers (1996); Moore et al., 1991, and Böhner and Selige (2006) in geographical information system. The results of this study while confirming the difference of about 15 times among performances of various algorithms, indicated that the mean soil erosion using the algorithm of Renard et al. (1997); Desmet and Govers (1996); Moore et al. (1991), and Böhner and Selige (2006) were 4.95, 19.47, 1.73, 1.34 t ha-1 yr-1 in case of the stability of other factors of RUSLE model. Considering the calculated amounts of slope length on the topographic map, the Desmet and Govers (1996) algorithm performed better than other algorithms in LS calculation for the study watershed. It clearly verified the necessity of selecting pertinent procedures for the calculation of input factors for the precise estimation of soil erosion.
Keywords
Makazi Province; Water and soil conservation; Sensitivity analysis; Soil erosion estimation; Soil erosion modeling
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