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Volume 16, issue 12 | Copyright

Special issue: Situational sea awareness technologies for maritime safety...

Nat. Hazards Earth Syst. Sci., 16, 2559-2576, 2016
https://doi.org/10.5194/nhess-16-2559-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 01 Dec 2016

Research article | 01 Dec 2016

Modeling the impact of river discharge and wind on the hypoxia off Yangtze Estuary

Jingjing Zheng1,2,3, Shan Gao1,3, Guimei Liu1,3, Hui Wang1,3, and Xueming Zhu1,3 Jingjing Zheng et al.
  • 1National Marine Environmental Forecasting Center, Beijing 100081, China
  • 2State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
  • 3Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, Beijing 100081, China

Abstract. The phenomenon of low dissolved oxygen (known as hypoxia) in a coastal ocean system is closely related to a combination of anthropogenic and natural factors. Marine hypoxia occurs in the Yangtze Estuary, China, with high frequency and long persistence. It is related primarily to organic and nutrient enrichment influenced by river discharges and physical factors, such as water mixing. In this paper, a three-dimensional hydrodynamic model was coupled to a biological model to simulate and analyze the ecological system of the East China Sea. By comparing with the observation data, the model results can reasonably capture the physical and biochemical dynamics of the Yangtze Estuary. In addition, the sensitive experiments were also used to examine the role of physical forcing (river discharge, wind speed, wind direction) in controlling hypoxia in waters adjacent to the Yangtze Estuary. The results showed that the wind field and river discharge have significant impact on the hypoxia off the Yangtze Estuary. The seasonal cycle of hypoxia was relatively insensitive to synoptic variability in the river discharge, but integrated hypoxic areas were sensitive to the whole magnitude of river discharge. Increasing the river discharge was shown to increase hypoxic areas, while decreasing the river discharge tended to decrease hypoxic areas. The variations of wind speed and direction had a great impact on the integrated hypoxic areas.

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In this paper, a three-dimensional hydrodynamic model was coupled to a biological model to simulate the ecological system of the East China Sea. In addition, the sensitive experiments were also used to examine the role of physical forcing (river discharge, wind speed, wind direction) in controlling hypoxia in waters adjacent the Yangtze Estuary. The results showed that the wind field and river discharge have significant impact on the hypoxia off the Yangtze Estuary.
In this paper, a three-dimensional hydrodynamic model was coupled to a biological model to...
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