Abstract
A better understanding of water transport processes is highly desirable for the exploitation of the ocean resources and the protection of the ocean ecological system. In this paper, the Lagrangian methods are used to study the water transport processes in Xiangshan Bay in China, a typical semi-closed and narrow-shaped bay with complex coastline and topography. A high-resolution 3-D hydrodynamic model is developed and verified, and the results from the model agree well with the field data. Based on the hydrodynamic model, the Lagrangian residual current is computed by using the particle tracking method. A concept based on the dynamical systems theory, the Lagrangian coherent structures (LCSs), is introduced to uncover the underlying structures which act as the transport barriers in the flow. The finite-time Lyapunov exponent (FTLE) fields are computed from the hydrodynamic model results to extract the LCSs. The results indicate that the LCSs act as the internal structures of the Lagrangian residual current and the Lagrangian residual current displays the residual current speed and direction of different water regimes separated by the LCSs. The water masses with different transport characteristics can be identified and their exchange ability with other water masses can be estimated by combining the Lagrangian particle tracking with the LCSs methods. The comprehensive applications of these Lagrangian methods reveal the underlying structures and the inhomogeneous characteristics of the water transport in Xiangshan Bay.
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Project supported by the National Natural Science Foundation of China (Grant No. 51279028), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51221961) and the Public Welfare Projects of China’s Oceanic Administration (Grant Nos. 200805086, 201105009).
Biography: LIANG Shu-xiu (1972-), Female, Ph. D., Associate professor
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Liang, Sx., Han, Sl., Sun, Zc. et al. Lagrangian methods for water transport processes in a long-narrow bay—Xiangshan Bay, China. J Hydrodyn 26, 558–567 (2014). https://doi.org/10.1016/S1001-6058(14)60063-9
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DOI: https://doi.org/10.1016/S1001-6058(14)60063-9