Abstract

Excessive scour downstream of stilling basins poses significant risk of structural failure. This problem was experimentally investigated at Michigan Technological University in a Froude-scaled, physical model of one such structure operated by the South Florida Water Management District. Detailed flow measurements were taken on a flow scenario that resulted in high scour, namely that of a high flow rate and upstream headwater depth and a low tailwater depth. Equilibrium bed scour and velocity measurements were taken using an Acoustic Doppler Velocimeter. Velocity data was used to construct a vector plot in order to identify which flow components contribute to the scour hole. It was found that downward-plunging flow upon leaving the stilling basin induces the primary scour hole.

Highlights

  • Despite the best efforts by engineers to design robust water control structures, bed scour can lead to unexpected structure failure if it is not monitored on a regular basis

  • Scour geometry was affected by the primary downward roller in combination with the counter rotating vortices

  • Numerous eddies caused by flow separation in the plan-view contributed to the scour geometry

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Summary

Introduction

Despite the best efforts by engineers to design robust water control structures, bed scour can lead to unexpected structure failure if it is not monitored on a regular basis. In situations where bed scour is known to threaten a structure, steps should be taken to reduce the rate at which bed scour occurs. The costs of both monitoring and remediation of bed scour can be minimized by conducting experiments on a scalemodel structure. A model of the structure in question may be constructed in order to study the effectiveness of the chosen method of bed scour reduction. These results, when used in conjunction with numerical modeling, should give the user a good idea of what to expect

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