Presenting Relations for Estimate the Scour Depth Due To Free Falling Jets.

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Presenting Relations for Estimate the Scour Depth Due To Free Falling Jets.

Bazargan J and Kalantari M.

J. Civil Eng. Urban., 5(5): 218-225, 2015; pii:S225204301500034-5

Abstract

High energy dissipation of the free falling jet from the flip-bucket has been always of utmost significance in prevention of the downstream rivers. Scouring due to falling jet incidence with the river bed will threaten the stability of the dam and related structures, while accumulation of eroded sediments can change tailwater elevation and influence the performance of dam or power plants outlets. So determination of the plunge pool dimensions is an important design consideration. The purpose of this study is to develop empirical exponential relations using the principles of statistics and dimensionless relations by applying dimensional analysis in order to estimate the scour depth due to falling jets considering the effective parameters such as discharge, the difference between water levels in the reservoir and tailwater (jet fall height), tailwater depth, the mean diameter of bed particles and flip-bucket jet angle. By comparing the results of the suggested relations in this study with other investigator results it can be indicated that the developed relations have the maximum correlation coefficient and minimum computational error in an appropriate standard deviation range. Also, the accuracy and dispersion of the 139 collected data series that were used for the proposed relations was higher than the previous studies.
Keywords: Dimensional Analysis, Dimensionless Relation, Flip-Bucket, Maximum Scour Depth, Plunge Pool

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