ESTIMATION OF WATER EXCHANGE IN RYUJIN-IKE INLET, OITA PREFECTURE, JAPAN
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- TSURUNARI Yoshihisa
- 大分大学 減災・復興デザイン教育研究センター
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- MOROOKA Sou
- 鹿児島大学 水産学部水産学科水圏科学分野
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- UCHIDA Kei
- NPO法人おおいた環境保全フォーラム付属はざこネイチャーセンター
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- NAKAI Mariko
- NPO法人おおいた環境保全フォーラム付属はざこネイチャーセンター
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- NISHI Ryuichiro
- 鹿児島大学 水産学部水圏科学領域
Bibliographic Information
- Other Title
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- 龍神池の水圏環境保全－主に海水交換から見た水循環システムの把握－
- リュウジンチ ノ スイケン カンキョウ ホゼン : オモニ カイスイ コウカン カラ ミタ ミズ ジュンカン システム ノ ハアク
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Abstract
Ryujin-ike inlet is a small, unique in Oita Prefecture and opens to the Pacific Ocean. The inlet is known for Nankai earthquake tsunami deposition inside the inlet. The local community set a small dam at the throat of the inlet, expecting significant sea shell catchment. Following the construction of the dam, sea shell production inside the inlet was decreased. The small dam was set to control the amount of flood tide, however, the sedimentation at the landside of the dam generated a quasi-natural shoal, resulting in a greater reduction in flood tide than expected. As a result, the water ex-change and dissolved oxygen contents are declining to levels lower than the previous natural condition. Thus, to improve current water exchange at the inlet; the water exchange at the throat, water quality inside the inlet, and the inlet topography have been studied. The study shows that the tidal water exchange is limited only during the high tides of a spring tide period by a maximum of 2,100m3 nearly every two weeks.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74 (2), I_1018-I_1023, 2018
Japan Society of Civil Engineers
