Abstract
Measurements were made of the velocity profile within a meter of the deep-sea floor at four locations off the California coast. Photographs of the boundary were taken to provide a means of evaluating the bed configuration. From these data it was possible to estimate the boundary shear stress, the drag coefficient, and the approximate height of the bed deformities. It is concluded that the deep-sea boundary-layer flow is hydrodynamically smooth only during periods of relatively low velocity and that it is generally transitional in nature. The boundary-layer flow is characterized by a drag coefficient that is highly variable and is related to the flow conditions as well as the bed configuration. The commonly used roughness Reynolds number criterion appears adequate to predict the transition from hydrodynamically smooth boundary conditions as long as the bed-roughness height, rather than the sediments diameter, is used as the characteristic length.
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