The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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THE IMPACT OF TYPHOON ON THE HYDRODYNAMIC AND POLLUTANT TRANSPORT IN COAST AREAS BASED ON LAGRANGIAN METHOD


Go-down ichd2016 Tracking Number 117

Presentation:
Session: Hydrodynamics in Ocean III
Room: Room 3
Session start: 10:30 Tue 20 Sep 2016

Zhaochen Sun   sunzc@dlut.edu.cn
Affifliation: Dalian U. of Technology

Jiafa Shen   shenjiafa@163.com
Affifliation: The Second Institute of Oceanography SOA

Yifei Zhang   zhang1213@163.com
Affifliation: The Second Institute of Oceanography SOA

Songlin Han   hansonglin@mail.crsri.cn
Affifliation: Changjiang River Scientific Research Institute


Topics: - Hydrodynamics in ocean, coastal and estuary engineering

Abstract:

A better understanding of pollutant transport processes is highly desirable for the exploitation of the ocean resources and the protection of the ocean ecological system. Based on the finite-volume coastal ocean model FVCOM, a three-dimensional storm surge model was developed in Xiangshan Bay and adjacent areas in Zhejiang Province, China. Taking typhoon “Haikui” as an example, the storm surge was simulated before and after the typhoon landing based on the wind fields from the outputs of typhoon model. Then a concept based on the dynamical systems theory, Lagrangian coherent structures (LCS) was introduced in the paper. Combined with LCS, Lagrangian particles tracking method, Lagrangian residual current and synoptic Lagrangian maps (SLMs), several Lagrangian methods were applied to study the pollutant transport in the study area. The impact of typhoon on the pollutant transport was analysed. The results reveal that the daily-average residual current is significant affected by typhoon. However, the influence time is limited to the period of typhoon action. The strong hydrodynamic processes caused by typhoon significantly changes the transport and distribution characteristics of pollutant. The characteristic of water transport regimes is changed and water mixing is increased due to the typhoon. The influence on water exchange time varies significantly with position.