Effect of Cohesive and Non-Cohesive Soils on Equilibrium Scour Depth
Article Sidebar
Main Article Content
Abstract
In this research ,the effect of cohesive soils ( clay ) and non –cohesive soils sand on equilibrium scour depth was studied .Experiments were carried out on two types of clay and two types of sand as a bed material using an obstruction ( pier ) to create a local scour. The effect of flow velocity and Froude number on scour depth and the occurrence time of equilibrium scour depth were studied . The results show that for the same conditions, the rate of scour in the clayey soils is less than in sandy soils. Also the time required for occurrence of the maximum scour depth ( equilibrium depth ) in clayey soils is more than in sandy soils. Two formulas were found to predict the equilibrium scour depth in terms of Froude number ,the first is for clayey soils and the second for sandy soils .
Metrics
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
THIS IS AN OPEN ACCESS ARTICLE UNDER THE CC BY LICENSE http://creativecommons.org/licenses/by/4.0/
Plaudit
References
Breusers , H.N., Nicollet , G ., and Shen , H .W., (1977) ,”Local scour around cylindricd piers “, Jounal of Hydraulic. Res . Delft . the Netherlands , vol. 15, No. 3 , p.p. 221-252. DOI: https://doi.org/10.1080/00221687709499645
Simons , D.B. and Senturk , F . (1970) ” Sediment transport technology ” ; Water Resources Publications , Fort Collins , Colorado , U.S.A.
Ahmed ,F.,and Rajaratnam,N.(1998),” Flow around bridge piers ” Jounal of Hydraulic Eng. ASCE , Vol. 124, No. 3 . pp. 288-300 . DOI: https://doi.org/10.1061/(ASCE)0733-9429(1998)124:3(288)
Garde , R.J.et.al . (1961) ” Scour around obstructions ” ;Journal of , Irrigation and power , vol 24, p.p 651-660
Laursen , E.M.(1980) ” Predicting scour at abutments ” ; General Report . No.3 , Dept . of Civil Eng., University of Arizona .
Melville , B.W. , and Raudkivi , A .J, (1987) ” Flow characteristics in local scour ” J. Hydr. Res ., Delft the Netherlands , 15 (4) , p.p. 373 -380 . DOI: https://doi.org/10.1080/00221687709499641
Raudkivi ,A.J., and Etetma , R ., (1977) ” Effect of sediment gradation on clear water scour ” ; J. Hydr. Eng . ,ASCE,103(10)P.P. 1209–1213. DOI: https://doi.org/10.1061/JYCEAJ.0004853