COMPARISON OF SEAWATER INTRUSION IN TWO RIVERS FLOWING INTO A SAME INNER BAY:FOR HABITAT EVALUATION OF RYUKYU-AYU

• HARADA Wataru

  Graduate Student, Department of Civil Engineering, Tokyo University of Science

• OHTSUKI Kazuaki

  Assistant Professor, Department of Civil Engineering, Tokyo University of Science

• NIHEI Yasuo

  Associate Professor, Department of Civil Engineering, Tokyo University of Science

• TAKAHASHI Mayumi

  Japan Transportation Consultants,Inc.

• SHIMATANI Yukihiro

  Professor, Department of Urban and Environmental Engineering, Kyushu University

Bibliographic Information

Other Title

• 同一内湾に流入する二河川の海水遡上特性の比較～リュウキュウアユ生息環境評価を念頭にして～

Abstract

Although the Sumiyo River has a similar size of basin and same inner bay to the Yakugachi River, it has smaller population of endangered freshwater fish called Ryukyu-Ayu, in Amami Oshima Is. Focusing on the upstream migration of the target species from inner bay, seawater intrusion measurement were conducted with GPS installed float, STD and ADCP. The result showed that the Yakugachi river has 6.9 times of total discharge from inner bay compared to the Sumiyo River from ebb tide to high tide. We speculated that the sill located on the entrance of the Sumiyo River is a blocking factor for seawater intrusion from inner bay.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 69 (4), I_1243-I_1248, 2013

  Japan Society of Civil Engineers

Keywords

• Ryukyu-ayu (Plecoglossus altivelis ryukyuensis)
• seawater intrusion
• tidal reach
• Amami Is.
• habitat

Details

• CRID: 1390001205352307968
• NII Article ID: 130004558143
• DOI: 10.2208/jscejhe.69.i_1243
• ISSN: 2185467X
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed