Numerical and experimental study on turbulence and material transport around local topographic change in coastal shallow area

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K06220
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 40030:Aquatic bioproduction science-related
• Research Institution: Fisheries Research and Education Agency
• Principal Investigator: FURUICHI Naoki 国立研究開発法人水産研究・教育機構, 水産技術研究所(神栖), 主任研究員 (70588243)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 乱流 / 粒子 / バー構造 / 沿岸浅海域

Outline of Final Research Achievements

On the basis of hydraulic model experiment and numerical simulation, we investigated turbulence and material transport in coastal shallow area. Special attention was directed to the role of small topographic changes such as sandbar on behavior of suspended particle matters that assumed transport of floating larvae. It was shown that the simulated results agreed well with the results from experiment, indicating the validity of the present numerical approach. We found that the turbulent mixing is intensified behind sandbar, which enhanced vertical exchange of suspended particle matters.

Free Research Field

Oceanography, Fisheries Engineering

Academic Significance and Societal Importance of the Research Achievements

今日、地球温暖化によって海水温・水位・波浪等の条件が将来的に変化してしまう可能性が指摘されており、我が国における気候変動適応ならびに水産業の持続可能な発展の観点から、流動など海洋構造の特性を適切に把握・予測することは必要不可欠の課題である。本研究は、数値流動シミュレーション・水理模型実験を活用した理想的条件での高精度の取得データに基づいて、砕波・乱流過程等に起因する鉛直断面上の物質輸送特性に関する知見の進展を目指すものであり、沿岸浅海域での漁場・環境形成や生活史の理解向上、関連する流動シミュレーション能力の高度化などへの貢献が期待される。