Journal of Food, Agriculture and Environment

Experimental study on the time development of local scour at a spur dike in a 180º flume bend

Author(s):

Alireza Masjedi ^1*, Mahmood Shafai Bejestan ², Amin Moradi ³

Recieved Date: 2010-01-18, Accepted Date: 2010-04-08

Abstract:

In this work, investigation on the time development of local scour at a spur dike. Spur dikes have been used extensively for erosion control in the external wall of river bends. Experimental investigation on scoring and determination of depth of scoring are among the most important issues in spur dike designation. The overall objective of the research is to study the temporal development of the scour for a spur dike. The study was conducted using a 180° laboratory flume bend with a relative radius of R/B = 4.67 operated under clear-water conditions. The median size and geometric standard deviation of bed material were equal to d₅₀= 2 mm and σ_g=1.7, respectively. Tests were conducted using one spur dike with 110 mm length in position of 60° under four flow conditions. In this study, the time development of the local scour around the spur dike plates was studied. The effects of various flow intensities (u_*/u_*c) on the temporal development of scour depth at the spur dike were also studied. The time development of the scour hole around the model spur dike installed was compared with similar studies on spur dikes. The results of the model study indicated that the maximum depth of scour is highly dependent on the experimental duration. It was observed that as flow intensities (u_*/u_*c) increases, the scour increases. Measuring time and depth of scouring based on experimental observation, an empirical relation was developed with a high regression coefficient of 97%.

Keywords:

Scour depth, spur dike, river bend, discharge

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Environment
Pages: 904-907

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