Flow Characteristics and Saline Wedge of the Density Flow in a Tidal River

Hideki TATSUMOTO, Jongsuk PARK*,† and Masami AIKAWA††

Faculty of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba-shi 263-8522 Japan
Graduate School of Science and Technology, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba-shi 263-8522 Japan
†† Faculty of Science, Kisarazu National College of Technology, 11-1 Kiyomidai- higashi 2-chome, Kisarazu-shi 292-0041 Japan

In order to catch the characteristic of the flow at saline wedge, the experiment for occurrence and flowing of saline wedge using a rectangular open channel was performed. Saline wedge is generally so stable that the visual observations are easy, and interfacial layers are measured with the aid of visualization method. As a result of the experiment, it was found that a saline wedge was reproduced well, and the form of tip of saline wedge changed by relative density and the amount of discharge on the upper reaches. It was also found that the thickness of the downstream freshwater depth was dependent upon the number of Richardson. The degrees of the dilution near the separation point could be displayed at the function with Fio in the density layer.

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