Physical Model of Local Scour at Grade Control Structures

by Noel E. Bormann, Colorado State Univ, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A physical model of local scour occurring at grade-control structures was operated at an undistorted Froude number prototype-model scale ratio of 1:4. The maximum unit discharge in the 3 feet wide model flume was 25 cfs/ft, this coincides with the minimum prototype discharge modeled. Of 88 tests completed, 7 cases occurred with similar hydraulic conditions at both 3 cfs/ft and 25 cfs/ft in the flume. This allows a comparison of model-prototype behavior. Results of this comparison indicate that model based predictions of local scour are within 25% of the observed scour depths using an empirical equation developed from the model data.

Subject Headings: Physical models | Structural models | Scour | Structural control | Hydraulic structures | Drop structures | Erosion | Scale models

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