Abstract
Abstract The effect of the shape of submerged dike/mound on seabed mud transport has been investigated by three-dimensional mud transport analysis. The numerical results show that the narrow hexagonal shape (plan view) has an advantage over the rectangular shape. This is because the outline of a narrow hexagonal shape is close to a streamline and it will cause less eddy flow and can divert suspended solid particles (SS) moving outside the cultivated area. Also, the effects of the height of the dike/mound and the average flow velocity have been studied numerically. Limited analyses show that increase in the height of the dike from 0.3 to 0.5 m can reduce SS concentration on the cultivated area by about 30% and increase the height of water column mixed with SS by about 0.5 m. Under the condition of a constant SS concentration at upstream boundary, increasing the average flow velocity will bring more SS into the area considered and there will be higher SS concentration on the cultivated area.
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