Accession Number:

ADA088893

Title:

Erosion Control of Scour during Construction; Report 2. Literature Survey of Theoretical, Experimental, and Prototype Investigations.

Descriptive Note:

Technical rept. 1 Oct 77-31 Oct 79,

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB

Personal Author(s):

Report Date:

1980-08-01

Pagination or Media Count:

207.0

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. Although much work has been performed to investigate and understand local scour of noncohesive material in unidirectional flow, relatively little has been spent on 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 found 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.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Civil Engineering
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE