MEASURING SAND DISCHARGE NEAR THE SEA-BOTTOM

Dieter Wenzel

Abstract


The direct and continuous measurement of the littoral drift is an essential problem with investigations on erosion of sandy coasts, as for instance at the island of Sylt. The measuring conditions require equipment of very particular features. Recent measurements have supplied informations about the conditions of sound propagation in sediment loaded water, leading to the conception of a sand discharge measuring device. It will consist in a combination of a current meter and a sand concentration meter. A convenient equipment is actually being developed. It is to supply an idea about the magnitude of the instantaneous sand discharge, the approximate remaining sediment transport vector, the phases of maximum and minimum sediment load, and so on. Consequently it will help to obtain a reliable statement about erosion processes, indispensable information for successful coastal engineering work.

Keywords


sand discharge; sea bottom; bed; discharge measurement

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