The Mechanics of Suspended Sediment due to Standing Waves

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Abstract
A theory is presented for the distribution pattern of suspended sediment concentration due to the action of standing waves. In order to take account of the effect due to the relative motion of suspended particles with respect to the fluid, the writer introduces a concept of ‘delay distance’ into the conservation equation for suspended sediment. The theoretical calculation is made on the assumption that the delay distance and coefficient of diffusion of suspended sediment are independent of the location. A fairly good agreement is shown in the comparison between the theory and the experiment with respect to the horizontal and vertical distributions of suspended sediment concentration. In the experiment, the measurement of suspended sediment concentration was made with a new type instrument developed at the Hydraulic Laboratory of Chuo University. The head of the instrument consists of two electrodes which are bent to a rectangular shape and detects the number of suspended particles passing through a slit of the head.

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