A numerical study on the circulation and tide in a zigzag bay
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A numerical study on the circulation and tide in a zigzag bay YU Huaming1,2, WANG Zhaohua1, KUANG Liang3, WANG Lu1,2, BAO Xianwen1*, WU He4, WANG Xin4, DENG Xiaodong5 1 College
of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China Physical Oceanography Laboratory of the Ministry of Education, Ocean University of China, Qingdao 266100, China 3 Environmental Resource Management, Inc., PA 19406, USA 4 National Ocean Technology Center, State Oceanic Administration, Tianjin 300112, China 5 East China Sea Marine Forecasting Center, East China Sea Branch, State Oceanic Administration, Shanghai 200081, China 2
Received 21 January 2014; accepted 23 May 2014 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2015
Abstract The Shacheng Bay (SCB) is one of the most complex coastal bays in southeast China and due to the fact of complicated geometry and dynamic coastal processes, it is considered as a challenging area for the numerical simulation of its hydrodynamic characteristics. The most advanced finite volume ocean model, finite-volume coastal ocean model (FVCOM), has adopted to simulate this hydrodynamic system, where tidal currents, tidal residual current and dye diffusion processes were studied and analyzed quantitatively. The validation of this numerical model matches well with various observation data, including elevation and current data. The misfit of a tidal elevation has a relative standard error of 3.66% and 4.67% for M2 and S2 tide components. The current validation shows a good match with an average error of 10 cm/s and 8° in the speed major axis and its direction respectively between the simulation and the measurement. This proves the robustness and reliability of this model. It is also found that the cape effect is significant and important in this system. The dye diffusion simulations show a 53 d flushing period for the whole inner bay waterbody. The results are of its first kind for understanding the hydrodynamic system in the SCB and they can provide helpful and trustful scientific information for others. Key words: FVCOM, Shacheng Bay, circulation, dye diffusion Citation: Yu Huaming, Wang Zhaohua, Kuang Liang, Wang Lu, Bao Xianwen, Wu He, Wang Xin, Deng Xiaodong. 2015. A numerical study on the circulation and tide in a zigzag bay. Acta Oceanologica Sinica, 34(1): 119–128, doi: 10.1007/s13131-015-0604-0
1 Introduction The Shacheng Bay (SCB) is a zigzag bay located in southeast China with an average depth of 20 m and a maximal depth of 58 m; it is an important harbor for fishery, aquaculture, tourism, and shipping (China Gulf Compiling Committee, 1994). The SCB is surrounded by mountains and has a quite irregular and curving coastline which is 35 km long and only 1–2 km wide. The area of the SCB is 76.62 km2, with 46.79 km2 intertidal salt marshes. There are also many natural islands spread across the bay entrance, including Nanguan Island, Beiguan Island and the Nanzhen Peninsula. These islands are the natural offshore barrier for various envi
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