Determining the effective parameters and their optimal combination in rill erosion modeling

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• 作者：Abolfazl Mosaedi ; Seyyedeh Motahareh Hosseini
• 关键词：Rill erosion ; Cross ; section of rills ; Slope ; Optimal model ; Gamma test
• 刊名：Arabian Journal of Geosciences
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：8
• 期：5
• 页码：3045-3053
• 全文大小：582 KB
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• 作者单位：Abolfazl Mosaedi (1)
  Seyyedeh Motahareh Hosseini (1)
  
  1. Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, P.O. Box. 91775-1363, Mashhad, Iran
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

Rill erosion is under the influence of several parameters which their recognitions and optimal combination will be necessary in modeling. One of the soil degradation reasons on hills of Mashhad vicinity is rill erosion that makes recognition of the behavior and control essential. So in this research, by establishing 50-m transects in each different slope length, effective parameters in shaping rills, including canopy cover, ground cover, gravel, sand, silt, clay, slope, and mutual effects between length and degree of slope have been measured. Surface area of rills has been calculated by measuring width and depth of each rill and their geometric sections. Gamma test has been applied in order to find optimal combination of input parameters. Whereas the statistical tests including gamma, V_Ratio, gradient, and standard error were different, combined statistics index of Modified Ideal Point Error (MIPE) has been employed. This statistic criterion shows that parameters composition including surface gravel, silt, slope and mutual effects between length and degree of slope is the optimal model. Ground cover, amount of silt, and gravel surface, respectively, play more important role when the priority of their effect is being considered.