Studying Scour Hole Development around Rectangular Bridge Piers.

Document Type : Research Studies

Authors

1 Assoc. Hydraulics Dept., Faculty of Engineering, Mansoura University.

2 Assistant Prof., Irrigation and Hydraulics Dept., Faculty of Engineering, Mansoura University

3 Teaching Assistant, Irrigation and Hydraulics Dept., Faculty of Engineering, Mansoura University.

Abstract

This paper presents an experimental study of local scour around rectangular bridge pier through open channels (clear water scour). Tests were carried out on two rectangular pier models with a change in the pier length using different flow discharge. Through this, geometric properties of scour hole were studied such as length, width and depth. The bed of used flume was covered by false wooden bed. The soil was extracted from Nile river bed (Damietta branch, kafr el-tawila) d50 equal to 0.29mm and the soil was classified to poorly graded sand (SP). A wireless camera fixed on the model was used to observe the change in scour depth with time and other outer camera fixed above the model to observe the change in the total scour hole. Through conducting the experiments the flow depths were changed, therefore the velocities and difference Froude number (Fr) were gotten. A group of mathematical relationships were obtained which gathering the geometric properties of scour hole with flow properties. It’s noted that from the study result, the depth of scour hole is reaching to average values of 87% from the maximum scour depth in the first two hours, but the horizontal dimension of scour hole is increasing by 80% from the maximum scour length

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