Assessment and prioritization of soil erosion triggering factors using analytical hierarchy process and Taguchi method |
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| Affiliation: | 1. Department of Nature Engineering, Faculty of Agriculture and Natural Resources, Ardakan University, Ardakan, Iran;2. Department of Watershed Management Engineering, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Tehran, Iran;3. Khamsan Representative and Paired Watershed, Sanandaj, Kurdistan, Iran;1. Pars Oil and Gas Company, Tehran, Iran;2. School of Geology, College of Science, University of Tehran, Tehran, Iran;1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China;2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, 210029, China;3. Yangtze Institute for Conservation and Development, Nanjing, 210098, China;1. EPROAD Research Unit, University of Picardie Jules Verne, IUT of Aisne, Saint Quentin, 02100, France;2. Hanoi University of Civil Engineering, Ha Noi, Viet Nam;1. Ministry of Education Key Laboratory of Water and Sediment Science, School of Environment, Beijing Normal University, Beijing 100875, China;2. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China;1. Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor 46417-76489, Iran;2. Agrohydrology Research Group, Tarbiat Modares University, Tehran 14115-336, Iran |
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| Abstract: | The main aims of this study are assessing some factors which affect the soil erosion process and evaluating the results of an analytical hierarchy process (AHP) method using the Taguchi method. Firstly, the weights for those factors and levels affecting soil erosion were determined by the AHP method. The determination of weights was based on the opinions of academic researchers, experts, middle managers, and members of the Soil and Water Research Centers in Iran. Secondly, an L32 Taguchi orthogonal array was selected based on the number of factors and levels for the current problem. Accordingly, 32 rainfall events were simulated and sediment yield amounts were measured. Analyzing the results of the Taguchi method, the weights of factors and levels were determined. The results showed that the weights obtained from the AHP method were not in accordance with the results of field measurements and the Taguchi analysis. The AHP method indicated that the main factors have the following order of importance: geological formation, rainfall intensity, silt content of soil as an indicator for the soil texture, vegetation cover, slope steepness, and slope aspect in the study area. However, the Taguchi method found the following order for the main factors: rainfall intensity, geological formation, silt content of soil as an indicator for the soil texture, slope steepness, vegetation cover, and slope aspect. As the Taguchi method works based on the quantitative measurements, the Taguchi results are more reliable rather than subjective methods such as AHP. It was also concluded that the AHP method should be used cautiously in assessing natural phenomena. Therefore, in the cases that in situ measurements are possible, it is better to use quantitative mathematical and statistical methods than to rely to qualitative knowledge based approaches. |
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| Keywords: | Soil erosion Taguchi method Analytical hierarchy process (AHP) method Optimization |
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