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The influence of suspended sediment concentration on the vertical velocity profiles in an intertidal environment

Section

Physical Sciences

Abstract

Boundary flow structure and suspended sediment concentration profiles were measured over a fortnight tidal cycle on an intertidal sandbank (Menai strait, U. K) with the aim of establishing the interrelationship between tidal development and sediment suspended sediment concentration on the vertical velocity profiles. In comparison with the neap tides, spring tides were characterized by stronger flows and occurrence of non-logarithmic velocity profiles. The flow profiles however, were logarithmic on ebbing neap tides. Moreover, ebb flows were faster than flood and slack water conditions were non quiescent. The pattern of the deviations of the flow profiles from the logarithmic form and their times of occurrence over a tidal cycle indicate that besides flow acceleration or deceleration and malfunctioning of the meters, wind effects were probably the major cause. Suspended sediment stratification did not appear to play part in causing deviations of the flow profiles from the logarithmic form.

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