Design of Pre-excavated Scour Hole Below Flip Bucket Spillways

by Nosratollah Amanian, Utah State Univ, Logan, United States,
Gilberto E. Urroz, Utah State Univ, Logan, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

A number of tests were performed on a model-scale flip bucket spillway with a gravel-bed plunge pool in order to develop equations to describe the geometry of the scour hole created by a trajectory jet impinging into the plunge pool. Equations were also developed to predict the dimensions of the berm that develops at the downstream end of the scour hole. Several model tests were performed to check the performance of pre-excavated scour holes. It was found that the pre-excavated scour hole geometry is very close to that of a self-excavated hole for the same flow parameters. A design example for pre-excavated scour holes is also presented.

Subject Headings: Scour | Spillways | Excavation | Gravels | Hydraulic design | Geometrics | Berms

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