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Effect of suspended sediment concentration on local scour around cylinder for clay–sand mixed sediment beds
Abstract Suspended sediments present in the flow are known to affect the flow resistance, velocity distribution and turbulent characteristics. Experiments were conducted in the laboratory flume to see the effect of suspended sediment concentration (SSC) on local scour around a cylindrical pier for a wide range of clay–sand mixed sediment beds for SSC up to 2700mg/L. It has been observed that the effect of SSC on equilibrium scour hole parameters such as maximum equilibrium scour depth, and longitudinal and transverse extent of scour hole can be significant. Present data showed that the presence of SSC in the range 993–1332mg/L can increase maximum equilibrium scour depth as much as 1.54 times compared to the clear water case. However, tests made for SSC in the range 2456–2700mg/L showed that the maximum equilibrium scour depth reduced compared to that for SSC in the range 993–1332mg/L, but these maximum equilibrium scour depths were still larger than that obtained for clear water. The effect of SSC on time variation of scour and equilibrium scour hole geometry was further investigated.
Research Highlights ► Local scour around cylindrical pier in cohesive bed is studied. ► Cylindrical pier is used for the experiments. ► The effect of suspended sediment concentration on pier scour is examined. ► Local scour depth is seen to depend on suspended sediment concentration.
Effect of suspended sediment concentration on local scour around cylinder for clay–sand mixed sediment beds
Abstract Suspended sediments present in the flow are known to affect the flow resistance, velocity distribution and turbulent characteristics. Experiments were conducted in the laboratory flume to see the effect of suspended sediment concentration (SSC) on local scour around a cylindrical pier for a wide range of clay–sand mixed sediment beds for SSC up to 2700mg/L. It has been observed that the effect of SSC on equilibrium scour hole parameters such as maximum equilibrium scour depth, and longitudinal and transverse extent of scour hole can be significant. Present data showed that the presence of SSC in the range 993–1332mg/L can increase maximum equilibrium scour depth as much as 1.54 times compared to the clear water case. However, tests made for SSC in the range 2456–2700mg/L showed that the maximum equilibrium scour depth reduced compared to that for SSC in the range 993–1332mg/L, but these maximum equilibrium scour depths were still larger than that obtained for clear water. The effect of SSC on time variation of scour and equilibrium scour hole geometry was further investigated.
Research Highlights ► Local scour around cylindrical pier in cohesive bed is studied. ► Cylindrical pier is used for the experiments. ► The effect of suspended sediment concentration on pier scour is examined. ► Local scour depth is seen to depend on suspended sediment concentration.
Effect of suspended sediment concentration on local scour around cylinder for clay–sand mixed sediment beds
Debnath, Koustuv (author) / Chaudhuri, Susanta (author)
Engineering Geology ; 117 ; 236-245
2010-11-12
10 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2011
Local scour around non-circular piers in clay-sand mixed cohesive sediment beds
| British Library Online Contents | 2012
Local scour around non-circular piers in clay–sand mixed cohesive sediment beds
| Online Contents | 2012