Document Type : Research Paper
Authors
1 Associate Professor, Soil Conservation and Watershed Management Research Institute, Iran,
2 MSc Student, Faculty of Engineering and Technology, Tehran University, Iran
3 Associate Professor, Faculty of Engineering and Technology, Tehran University, Iran
Abstract
Investigating local scour phenomena due to jet flow on downstream of hydraulic structure is an important and necessary issue. In this article, the results of a laboratory study about the impact of tail water depth on local scour below of jet flow are provided. Circular, square and rhombus sections with a water jet from a hole, and, with a discharge of 2.46 to 4.8 liters per second, on a medium material bed of d50 of three mm made of sand, with tail water depth ranged from 10 to 24.8 cm, for 60 minutes, was simulated. The dimensions of scour holes were measured and analyzed. Results demonstrated that the maximum scour depth, with increased tail water depth to a certain extent, increased, and then, tail water will be reduced with more depth. It also became clear that the dimensions of scour holes with the following parameters of and their relation with power. Finally, the dimensional relationships for the estimation of scour depth of discharge and the tail water variety have been proposed.
Keywords
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