OBSERVATION AND SIMULATION STUDY OF TRANSPORT MECHANISM OF PLANKTON CAUSING SHELLFISH POISONING IN KESENNUMA BAY
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- IWAMOTO Naoya
- 首都大学東京大学院 都市基盤環境学域
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- SHINTANI Tetsuya
- 首都大学東京大学院 都市基盤環境学域
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- SHIBASAKI Reo
- 首都大学東京大学院 都市基盤環境学域
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- NATSUIKE Masafumi
- 北海道立総合研究機構 函館水産試験場
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- YAMADA Yuichiro
- 北里大学 海洋生命科学部
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- YOKOYAMA Katsuhide
- 首都大学東京大学院 都市基盤環境学域
Bibliographic Information
- Other Title
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- 気仙沼湾における貝毒原因プランクトンの移流に関する観測とシミュレーション検討
- ケセンヌマワン ニ オケル カイドク ゲンイン プランクトン ノ イリュウ ニ カンスル カンソク ト シミュレーション ケントウ
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Abstract
We investigated the transport characteristics of toxic plankton Alexandrium tamarense, in the Kesennuma Bay. We conducted the field survey for A. tamarnese distribution during the bloom in 2013 and 15 month-long velocity monitoring at the Oshima-seto together with plankton monitoring in 2014. The survey indicated the trend in the plankton transport from the innermost part to the south and east areas of the bay. The velocity monitoring also showed positive correlation between the A. tamarense density and the velocity measured at the Oshima-seto. To support these results, 3D numerical simulation was carried out with the particle tracking simulation assuming the planktons as gravitationally neutral particles. The 10,000 particles were initially placed inside the innermost part where the origin of A. tamarense was highly suspected. The particles mainly drifted in the surface layer and 33% of these were transported to south through the west bay and 12% to the Oshima-seto within 3 days. Although the simulated result revealed the transport as expected, the speed of the transport might get slower by considering diurnal vertical migration of the plankton.
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_1159-I_1164, 2018
Japan Society of Civil Engineers