Experimental Study on the Threshold Shear Stress of fine sediments (Case Study: Karkeh Reservoir Dam Sediments)

Document Type : Technical Note

Authors

1 Water Resources Research Center

2 Sahrekord University

3 Ferdosi Mashhad University

Abstract

Understanding the transfer of cohesive sediment is very important for the development and maintenance of dam reservoir and transfer channels in estuaries. Obviously, more data is needed in area for better understanding of the behavior especially rate of erosion of the fine sediment. Thus in this research the sediments of Karkheh dam reservoir have been investigated. For this propose with use circular flume located in Shahrekord university water and soil science laboratory of Water Resources Research Center, trend of concentration of eroded sediments, threshold erosion shear stress and erosion rate for different periods of consolidation (3, 14 and 30 day) have been investigated. The result showed The concentration of eroded sediment varied as a function of consolidation age and shear bed stress. It was also period of consolidation influenced the threshold shear stress of the Karkhe reservoir sediment, which obtained values were 0.16, 0.22, and 0.31 N/m2 for the 3, 14, and 30 day consolidation, respectively. The result showed that the erosion rate is inverse relation with the period of consolidation, so that in the same stresses, the increase of the consolidation period will reduce the erosion rate.

Keywords

References

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Journal of Hydraulics
Volume 13, Issue 3 - Serial Number 133
January 2019
Pages 107-115

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History

  • Receive Date: 31 December 2017
  • Revise Date: 01 March 2018
  • Accept Date: 02 March 2018

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