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Local scour of cohesive beds downstream of a rigid apron
In this paper, the physics of scour hole in a mixed sand–clay bed downstream of an apron is studied experimentally. Seven combinations of sand–clay mixtures including clay contents, C c , ranging from 0 to 0.4 were used. The results show that C c = 0.4 can reduce the maximum scour depth, ε m , up to about 80% for all the densimetric Froude numbers in the range of the present study. An empirical equation has been proposed for calculation of ε m in sand–clay mixtures with the mean error of 0.12. The removal mechanism of sediments from the bed was different based on the C c . For low clay contents, i.e., C c ≤ 15%, individual particles were detached from the bed. At higher C c , clusters of particles were separated and moved downstream with the flow. A new equation has been proposed to predict the dimensionless scour hole profile in mixed sand–clay sediments. Dimensionless graphs have been presented for incorporating the effect of tailwater depth and sediment grain size on the main characteristics lengths in sand–clay mixtures.
Local scour of cohesive beds downstream of a rigid apron
In this paper, the physics of scour hole in a mixed sand–clay bed downstream of an apron is studied experimentally. Seven combinations of sand–clay mixtures including clay contents, C c , ranging from 0 to 0.4 were used. The results show that C c = 0.4 can reduce the maximum scour depth, ε m , up to about 80% for all the densimetric Froude numbers in the range of the present study. An empirical equation has been proposed for calculation of ε m in sand–clay mixtures with the mean error of 0.12. The removal mechanism of sediments from the bed was different based on the C c . For low clay contents, i.e., C c ≤ 15%, individual particles were detached from the bed. At higher C c , clusters of particles were separated and moved downstream with the flow. A new equation has been proposed to predict the dimensionless scour hole profile in mixed sand–clay sediments. Dimensionless graphs have been presented for incorporating the effect of tailwater depth and sediment grain size on the main characteristics lengths in sand–clay mixtures.
Local scour of cohesive beds downstream of a rigid apron
Omid, Mohammad Hossein (author) / Hamidifar, Hossein
2017
Article (Journal)
English
Local scour of cohesive beds downstream of a rigid apron
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