関係者各位
沿岸環境科学研究センター
化学汚染・沿岸環境研究拠点（LaMer）
拠点長 岩田 久人
沿岸環境科学研究センター（CMES）、共同利用・共同研究拠点「化学汚染・沿岸環境研究拠点（LaMer）」プロジェクトの一環として予定しておりました、第２１回特別講演会の日程を９月５日（水）に変更いたしました。台風の影響が懸念されますため、ご理解のほど何卒よろしくお願いいたします。
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記
日時：２０１８年９月５日（水） １０：００～
場所：理学部 総合研究棟1. ４階会議室
内容：The nonlinear effects of the eddy viscosity and the bottom friction on the
Lagrangian residual velocity in a narrow model bay
講師：Prof. Wensheng Jian
(College of Environmental Science and EngineeringOcean University of China)
要約：The nonlinear effects of the eddy viscosity and the bottom friction on the Lagrangian residual velocity (LRV) are studied numerically in a narrow model bay. Three groups of the experiments with different eddy viscosity and different forms of the bottom friction are designed and are carried out in the three kinds of the topography. When the eddy viscosity is obtained from a two-equation turbulence closure model, the pattern of the LRV is more complex than that of the time invariant eddy viscosity case and the intensity is from more than 1.3 times to one order smaller than that of the linear eddy viscosity condition. The LRV are also acquired when the eddy viscosity varies from the flood-averaged one to the ebb-averaged one. It is found that when the flood-averaged eddy viscosity is bigger than the ebb- averaged eddy viscosity (flood-dominated asymmetry), the direction of the breadth-averaged LRV and the 3D LRV is nearly opposite to that when the eddy viscosity asymmetry is reverse (ebb-dominated asymmetry). However, the intensity of the LRV for the ebb-dominated case decreases toward the flood- dominated case as the ratio of the maximum depth in the deep channel and the minimum depth on the shoal increases. The different forms of the bottom friction also play a role in the LRV. The structures of the 3D LRV and the depth-integrated LRV are simpler, and the intensity of the LRV is two times smaller when the linear bottom friction is used than those when the quadratic bottom friction is used.
以上
ご不明な点は、下記までお問い合わせください。 化学汚染・沿岸環境研究拠点
（Leading Academia in Marine and Environment Pollution Research）
Email: lamer@stu.ehime-u.ac.jp