Analytical and experimental investigation of temporal variation of clear water scour depth at bridge abutments

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2007

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Köse, Ömer

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Computation of temporal variation of clear water scour is important for the design of bridge foundations. Previous studies conducted for determining equilibrium scour depth at bridge abutments indicated that very long flow duration was needed to achieve equilibrium scouring situations. However, the corresponding durations in the prototype conditions may yield considerably greater values than time to peak of the design flood. Therefore, there is a need to estimate the temporal variation of scour depth. An experimental study was carried out to observe temporal variation of scour depth and contours around vertical-wall and wing-wall abutments. The results of the experiments have been interpreted. A semi-empirical model has been developed for determining time-dependent variation of clear water scour depth at vertical-wall abutments. This approach is based on the application of sediment continuity equation to the scour hole around the vertical-wall abutment. To this end, time-dependent geometric features of the scour hole were investigated and a recent sediment pickup function was used to formulate the rate of sediment transport out of the scour hole. The results of the proposed model were compared with those of some empirical models. The findings of the model agree well with the experimental results.

Subject Keywords

Civil Engineering.

URI

http://etd.lib.metu.edu.tr/upload/3/12608387/index.pdf
https://hdl.handle.net/11511/17211

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ö. Köse, “Analytical and experimental investigation of temporal variation of clear water scour depth at bridge abutments,” Ph.D. - Doctoral Program, Middle East Technical University, 2007.