Volume 20, Issue 78 (Winter 2017)                   jwss 2017, 20(78): 77-88 | Back to browse issues page

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Tavanpour N, Aflatooni M, Nazari N. Determination of Sub-Basins Flow Contribution to Total Flood in Khersan River Basin. jwss 2017; 20 (78) :77-88
URL: http://jstnar.iut.ac.ir/article-1-3437-en.html
1.بخش مهندسي آب، دانشكده كشاورزي، دانشگاه شيراز , nima.tavanpour@gmail.com
Abstract:   (10524 Views)

This research is aimed to determine the contribution of sub-basins flow to total watershed flood in Khersan river basin located in Kohkilooyeh and Boyer Ahmad province. To do this, the rainfall-runoff model HEC-HMS was used to simulate peak runoff values for 11 sub-basins. HEC-HMS input was constructed using GIS. The results suggest that the change in different return periods is accompanied by small change in prioritization of flood-potential of the sub-basins; so that for return periods of 2, 50 and 100 years, the most contributions came from sub-basins 1 through 11, respectively. With respect to area and flow rate, contribution of sub-basins to watershed total flow was different. The effect of area was between 0.31 to 1.03 percent; namely, sub-basin 6 showed the highest rank and basin 7 showed the lowest one. With respect to peak flow rate, the effect of individual exclusion of sub-basins, resulted in contribution between 51.2 to 1004.2 m3/s, that is, sub-basin 6 showed the lowest effect and the sub basin 11 showed the highest contribution.

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Type of Study: Research | Subject: Ggeneral
Received: 2017/01/24 | Accepted: 2017/01/24 | Published: 2017/01/24

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