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The Interaction of Fluid and Sediment on the Foreshore.
CHICAGO UNIV ILL DEPT OF THE GEOPHYSICAL SCIENCES
Pagination or Media Count:
Investigation of the sediment transport of uprush and backwash of a single surge cycle was made. Direct observation in the present study indicates that for the main body of the fluid, accelerating or decelerating unidirectional flow is a reasonable characterization. The uprush, initially a bore, then a surge over a dry bed, has traditionally been considered to be so complicated as to defy characterization of the internal flow. However, the present study has shown that the uprush may be divided into two distinct portions the leading portion the tongue characterized by extreme turbulence and with a high proportion of sediment in suspension and in traction. The remainder of the uprush and the whole of the backwash may be regarded as decelerating or accelerating unidirectional flow, exhibiting the expected but transient sequential bedform features. It thus appears that analysis of the bedform mechanics is feasible using unidirectional flow methods.
APPROVED FOR PUBLIC RELEASE