A hydraulic analysis of shock wave generation mechanism on flat spillway chutes through physical modeling

Muhammad Kaleem Sarwar, Muhammad Atiq Ur Rehman Tariq, Rashid Farooq, Hafiz Kamran Jaleel Abbasi, Faraz Ul Haq, Ijaz Ahmad, Muhammad Izhar Shah, Anne W.M. Ng, Nitin Muttil

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Abstract

Shock waves are generated downstream of spillways during flood operations, which have adverse effects on spillway operations. This paper presents the physical model study of shock waves at the Mohmand Dam Spillway project, Pakistan. In this study, hydraulic analysis of shock waves was carried out to investigate its generation mechanism. Different experiments were performed to analyze the rooster tail on a flat spillway chute and to examine the factors affecting the characteristics of the rooster tail. The study results show that shock wave height is influenced by spillway chute slope, pier shape, and flow depth. Moreover, the height of the shock wave can be minimized by installing a semi-elliptical pier on the tail part of the main pier. Further modifications in the geometry of the extended tail part of the pier are recommended for the elimination of the shock wave. Based on observed data collected from the model study, an empirical equation was developed to estimate the shock wave height generated on the flat slope spillway chutes (5 to 10 ).

Original languageEnglish
Article number186
Pages (from-to)1-13
Number of pages13
JournalHydrology
Volume8
Issue number4
DOIs
Publication statusPublished - Dec 2021

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