Observation and Hydrodynamic Simulation of Tidal Current and Seawater Exchange in the Kesennuma Bay, Northeastern Japan
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- SHIBASAKI Reo
- Dept. of Civil and Environmental Eng., Tokyo Metropolitan University
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- SHINTANI Tetsuya
- Dept. of Civil and Environmental Eng., Tokyo Metropolitan University
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- FUKUSHIMA Keitaro
- Center for Ecol. Res., Kyoto University
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- KOBAYASHI Masayuki
- Yachiyo Engineering CO., LTD.
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- YOKOYAMA Katsuhide
- Dept. of Civil and Environmental Eng., Tokyo Metropolitan University
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Abstract
We observed the seawater flow pattern during the ebb and flood tide in the Kesennuma Bay, northeastern Japan, using towing and bottom-mounted ADCPs. We also simulated the flow pattern with the hydrodynamics simulation model Fantom-Refined in order to elucidate the characteristics of water current in relation to the topography. The observed data indicated that the eastern bay had a large flow rate compared to the western bay. It was also found that topographical condition strongly influenced the direction of the tide-induced flow. Numerical simulation result indicated that the ebb current at a depth of 5 m was found to be weakened around the Okawa River mouth; in the northern part of the western bay, and the flow was prevailing through the narrow channel called Oshima-Seto to east. During the flood tide, the inward water flow from the Pacific Ocean to both the eastern and the western bay was dominant, but the current was weakened and reversed in the middle region of the western bay. This flow pattern should be caused mainly by asymmetricity of the depth between the eastern and the western part of the Kesennuma Bay.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74 (2), I_631-I_636, 2018
Japan Society of Civil Engineers