NUMERICAL ANALYSIS OF DISPERSION–RETENTION OF CORAL LARVAE BEFORE AND AFTER LARGE-SCALE CORAL BLEACHING IN AMITORI BAY, IRIOMOTE ISLAND, JAPAN
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- MURAKAMI Tomokazu
- 国立研究開発法人防災科学技術研究所 水・土砂防災研究部門
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- KOHNO Hiroyoshi
- 東海大学 沖縄地域研究センター
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- NAKAMURA Masako
- 東海大学 海洋学部水産学科
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- NORITAKE Koki
- 東海大学 海洋学部海洋生物学科
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- KINOSHITA Hinano
- 東海大学 海洋学部水産学科
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- MIZUTANI Akira
- 東海大学 沖縄地域研究センター
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- SHIMOKAWA Shinya
- 国立研究開発法人防災科学技術研究所 水・土砂防災研究部門
Bibliographic Information
- Other Title
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- 西表島網取湾におけるサンゴ大規模白化前後の幼生分散・滞留の数値解析
- イリオモテジマモウシュワン ニ オケル サンゴ ダイキボ ハクカ ゼンゴ ノ ヨウセイ ブンサン ・ タイリュウ ノ スウチ カイセキ
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Abstract
<p> Large-scale coral bleaching occurred in August, 2016 in Amitori Bay, Iriomote Island, Okinawa, Japan. This study was conducted to clarify the situation of dispersion–retention of coral larvae before and after large-scale coral bleaching.</p><p> Data of the coral coverage degree, the date and time of simultaneous spawning, spawning rate, and velocity/direction of the wind during 2016–2019 were obtained by field observation. Results demonstrate that the spawning rate, which once decreased to 37.5% in 2017 because of bleaching, recovered to 90.0% in 2019. Then, based on the data, analyses were conducted to assess the larva dispersion–retention numerically during coral spawning during 2016–2019. Results clarified that in 2016, before bleaching, the arrival rate of the larvae in the open sea was lower and that the retention rate within the bay was higher than in other years because more larvae were emitted than in other years. Additionally, the northerly winds were remarkable.</p>
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) 76 (2), I_840-I_845, 2020
Japan Society of Civil Engineers