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|Title:||Field tests of cross-shore sand-transport models in oscillatory flow|
|Authors:||Scripps Institution of Oceanography.|
White, Thomas E.
|Publisher:||Coastal Engineering Research Center (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; CERC-95-13.|
Abstract: Sand transport as bed load on nearly flat beds in shallow water outside the breakers is the subject of this study. The appropriate variables necessary for computation of sediment transport are grouped into a few dimensionless force ratios using the techniques of dimensional analysis, forming a sediment transport model. Seventeen different bed-load models are classified, described, reduced to the same set of notation, compared, and tested against measured transport. Field experiments measuring fluid velocity and sand transport were performed seaward of the breaker region. Fluorescent sand tracer was used to measure both sediment-transport velocity and thickness. Techniques for dyeing , injecting, and coring sand were developed and tested. A total of 30 tracer experiments were performed under differing wave and sediment conditions. Transport thickness is well-correlated with orbital diameter but not wave height or fluid velocity. Different powers of the fluid velocity are compared with sediment transport. The lower velocity moments perform much better than the higher moments. Even more important than which lower-order moment is used to predict sediment transport is the accurate measurement of fluid velocity, particularly the mean flow. Use of a threshold criterion is essential in predicting whether the sand transport is onshore or offshore. Determining functional dependence of transport on quantities other than fluid velocity (sand size, sand density, transverse fluid velocity, peak wave period) requires a larger range of conditions than present in these experiments. NOTE: This file is large. Allow your browser several minutes to download the file.
|Appears in Collections:||Technical Report|