Author(s): M. Mokhi Es Abou-Seida; Jen-Men Lo; M. A. Muralidhar

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Abstract: Experimental runs were carried out in the open recirculating channel in the Hydraulics Laboratory of the Kuwait Institute for Scientific Research to study variations in velocity distribution and suspended-sediment concentration due to currents, waves and combinations of these. A laser Doppler anemometer was used to measure the velocities at different water depths for three wave conditions, three current conditions and nine wave-current coexistence cases. Measurements showed that the familiar logarithmic current profile can be used to represent the change in velocity with water depth in currents without waves and in current-wave coexistence fields. The coefficient values in such a distribution depend on the ratio between the average current speed and the wave-induced current value. For the study of suspended sediment concentration, a specially designed suction instrument was manufactured in the laboratory workshop to collect the watersand mixture with variable-speed pumps that allowed average space and time concentrations to be obtained at different water depths. Measurements revealed two regions: of high concentration close to the bed, and of low concentration away from the bed. Two empirical expressions were developed to represent these distribution concentrations, together with an expression to obtain the thickness of the high-concentration layer. These expressions can be used in numerical model studies to estimate the suspended-sediment transport rate along the coasts.

DOI: https://doi.org/10.1080/00221689209498884

Year: 1992