Author
|
Submitted to: Journal of Hydraulic Engineering
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 7/1/1996 Publication Date: N/A Citation: N/A Interpretive Summary: No original research reported. No interpretive summary needed. Technical Abstract: An analysis of local scour in the vicinity of storm surge barriers is presented in the subject paper. However, much of the scour discussion applies to other types of hydraulic structures, e.g. stilling basins. Initially the scour and scour depth increase in the vicinity of a structure is rapid. With time, the rate of sediment removal from the scour hole decreases but scour never completely stops. As scour approaches the equilibrium value in tidal waters scour will occur only for a very few minutes at the peak of the flood stage, so significant changes in the scour dimensions will occur only after very many tides and very long elapsed time. Scour holes may occur downstream of riprap bed protection. These are caused by the characteristics immediately downstream of roughness discontinuity in open channel flows. The approach to the stabilization of the scour hole is: First determine the maximum extent of scour for the design flows, then shape the bed to the scoured shape, or slightly larger than the scoured shape, to insure that no erosion of the design shape will occur. |
