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Title: Erosion control of scour during construction. Report 2, Literature survey of theoretical, experimental, and prototype investigations
Authors: Hales, Lyndell Z.
Keywords: Construction practices
Construction projects
Erosion control
Coastal structures
Hydraulic structures
Water waves
Sediment transport
Literature review
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-80-3 rept. 2.
Description: Technical Report
Abstract: Waves breaking on structures in the coastal zone cause bottom material to be tossed into suspension and carried from the region by longshore or other currents. The scour holes that develop may require substantial amounts of material for rehabilitation and may even endanger the functional integrity of the structure. A substantial amount of work has been performed to investigate and understand local scour of noncohesive-material in unidirectional flow. Relatively little effort has been spent on the study of the problem of local scour around structures under wave action. Less work has been performed on the problem of scour under the dual processes of wave motion and unidirectional flow. Many of the theoretical investigations regarding scour and erosion under wave-induced effects have been founded on earlier work regarding scour and sediment transport mechanics developed from river aspects. These unidirectional theories have been modified to account for the increased shear stress and pressure variations induced by the oscillatory wave field. This report is a survey of the existing literature that has been directed toward understanding the sediment transport by wave and current actions, and the scouring and erosion problems that result around major structures as a result of these phenomena. The primary forcing function is the incoming surface gravity wave train in most cases, and refraction causes concentrations of wave energy that increase scouring potential. The bottom hydrography is altered, and this is reflected in changes to the refraction patterns of the wave system. Theoretical and numerical work to couple wave characteristics, refraction, diffraction, and sediment transport mechanics to deduce resulting bottom configurations is truly in its infancy. However, the basic theoretical groundwork has been laid on which more sophisticated and analytically sound developments can be built to provide reliable engineering computations of scour near coastal structures. NOTE: This file is large. Allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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