1968•Coastal Engineering ProceedingsOpen access

HYDRAULIC MODEL EXPERIMENT ON THE DIFFUSION DUE TO THE COASTAL CURRENT

Haruo Higuchi, Yuichi Iwagaki

Abstract

The diffusion phenomena due to the tidal current and the longshore current inside and outside a harbor are studied m a hydraulic model experiment, for which the Kashima Harbor area is used as the prototype. The tidal current, the longshore current and the effect of density are taken into account, but the direct effects of wind and waves are not considered. A model of Kashima Harbor, with horizontal and vertical scales of 1/500 and 1/63 respectively, was constructed, and a semidiurnal tide generated by an automatically controlled pneumatic tide generator and longshore current by a water circulating system were provided for it. The water level at 4 stations and current pattern were measured. The diffusion of dyed water from instantaneous point sources and a continuous point source was investigated by the photographic method and dye concentration analysis.

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Key concepts: Current (fluid), Longshore drift, Tidal current, Diffusion, Point source, Rip current, Environmental science, Generator (circuit theory)