Graduate Thesis Or Dissertation
 

An operation study of the wheelwash dredge Sandwick

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  • An interesting means of shoal removal has recently been implemented by the U.S. Army Corps of Engineers for use in shallow Pacific Coast tidal inlets and estuaries. In the past, removal of shoaled material has consisted of physical excavation of material, transportation from the site, and placement in a spoils area. The present study considers a method of shoal removal by agitation dredging; the shoaled material is placed into suspension by propeller wash and is then carried downstream by natural currents. The interrelationships of the variables governing the wheelwash process were investigated by a systematic study of the basic parameters. A determination of the propeller and deflector door hydrodynamics on a modified landing craft, the LCM Sandwick, was undertaken along with documentation of the scour process and altered settling in the propeller wake region. Laboratory models were used to confirm theoretical predictions and for comparison with field measurements regarding scour depths and efficiencies.
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