The study on three-dimensional numerical model and fronts of the Jiulong Estuary and the Xiamen Bay
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The study on three-dimensional numerical model and fronts of the Jiulong Estuary and the Xiamen Bay LUO Zhibin1 , PAN Weiran1 , LI Li2 , ZHANG Guorong1∗ 1 2
College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Received 22 October 2011; accepted 5 March 2012 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2012
Abstract Applying the methods of on-site observation and dynamic model, the research on the fronts at the Jiulong Estuary has been carried out, during which spatial and temporal distribution, dynamic characteristics and formation mechanism of salinity fronts are analyzed and discussed. The research shows that the estuarine fronts mainly lie in the area from the Jiyu Islet to the Haimen Island, outside of Yuweizai to Hulishan cross-section, the near coast of Yuweizai and the south of the Songyu-Gulangyu Channel. The fronts in the former two regions are formed directly by plume, while the one near the coast of Yuweizai is a tidal intrusion front caused by flood current and the one at the south of the Songyu-Gulangyu Channel is the result of current shear transformation. Under normal circumstances, fresh water of the Jiulong River mainly influences the inside of the Xiamen Bay, and when it is in typhoon seasons, plume front can affect the Taiwan Strait and has an effect on the biogeochemical processes in the strait. Key words: Jiulong Estuary, Xiamen Bay, three-dimensional numerical model, fronts
morino and Trump (1996) and Brubaker and Simpson (1999), at the James Estuary of the Chesapeake Bay and by using towed ADCP, carried out an underway observation, and described precisely the current field’s 3-D structure and its varying process. Shen and Boon (1999) further applied three-dimensional baroclinic models to simulate the generating process of the front, studied the circulation and the material transportation in neap-spring cycle, and carried out a dynamic analysis of front’s influence on larva. Xu et al. (2008) used a three-dimensional numerical model (EFDC) to examine the wind impact on pollutant age distributions and residence time in the Pamlico River Estuary (PRE). It suggests that across-river winds may lead to longer residence time through enhanced turbulence mixing. And Xu et al. (2009) applied the HEM-3D model to investigating the pollutant age distribution under different river discharge conditions in the PRE. The results show that the salinity intrusion plays an important role in the spatial variation of the pollutant transport age. Luo et al. (2008) used a coupled 3-D hydrodynamic-ecological numerical model to investigate the distribution and causes of the hypoxia phenomena in the Zhujiang River Estuary. It shows
1 Introduction Estuarine front is the transition belt where the river water and the seawater mix intensively. In the belt, both of marine physical and chemical properties are different from the sides, and its existence has a great influence on the
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