Application of partial least squares regression and WetSpa model to determine factors controlling sediment yield in Chardavol watershed,Iran |
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| Authors: | Hossein Zeinivand |
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| Institution: | Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran |
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| Abstract: | This paper examines the effects of watershed complexity in terms of physiography and land use on the specific sediment yield of the Chardavol watershed (1012.946 km2) in Iran. First, specific sediment yield was simulated using spatially distributed hydrological WetSpa model, then the influential factors such as morphometric variables, land-use composition and pattern and soil properties of the watershed were calculated at the sub-watershed scale. Due to the inter-reliant of these watershed characteristics, a partial least squares regression (PLSR) was used to illustrate the relationship between the specific sediment yield and data of 15 selected watershed characteristics. The results showed that the land-use composition and soil properties had the maximum effects on the specific sediment yield and clarified 79% of the variation in the specific sediment yield. Regarding the availability of digital spatial database over the watershed, this simple PLSR procedure could be applied in different watersheds. |
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| Keywords: | Sediment yield Land-use composition SDR partial least squares regression WetSpa model |
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