Assessment the Effects of watershed management operations on the characteristics of runoff and suspended sediment load in Ghaleh Gol Watershed, Lorestan province

Document Type : Research Paper

Authors

1 Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, Lorestan University

2 Department of Range and Watershed Management Engineering,Lorestan University, Khorramabad, Iran

Abstract

In recent years, extensive practices have been done on flood control, erosion and sediment in the fields of research and implementation of watershed management. Therefore, the purpose of this study was to assess the effects of watershed management practices on the characteristics of runoff and suspended sediment load in two subwatersheds in Ghaleh Gol watershed in Lorestan province, Iran. In this research, for comparing the effect of watershed management practices (WMP) on discharge and suspended sediment load (SSL) from both subwatersheds, the flow velocity was measured and the SSL was sampled directly from the beginning of the rainfall events until the end of them. Results showed that in all measurements, the discharge and suspended sediment load of the southern subwatershed with watershed management practices was higher than the northern subwatershed without such practices. According to the results of ANOVA test, it was found that the difference between discharge peak (P=0.691) and suspended sediment load peak (P=0.840) was not significant in two subwatersheds. Also, according to the results, the difference between specific discharge and specific SSL was not significant (P>0.05). Based on these results, it was found that the implementation of WMP in the study area apparently has no the required performance to reduce the discharge and SSL, and the WMP have lost their performance before the end of their useful life. Therefore, in order to increase the performance of mechanical watershed management practices (MWMP), the biological and biomechanical practices has to be performed simultaneously.

Keywords


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Volume 74, Issue 4
March 2022
Pages 851-866
  • Receive Date: 31 December 2021
  • Revise Date: 29 January 2022
  • Accept Date: 01 February 2022
  • First Publish Date: 20 February 2022