This paper comments and analyses the research progress of the estuary sediment and ecological environment, including saltwater intrusion phenomenon and laws, sediment and ecological environment. The physical context, sediment and ecological environmental problems of the tributary bay of TGR are analyzed comparatively with those in ocean estuary. Based on the existing research and achievements, this paper puts forward that the research ideas and methods of the ocean estuary should be drawn from, and outlooks the future research works on the dynamic and ecological environmental problems in tributary bays of TGR.
Water level has risen considerably since the impounding of Three-Gorges Reservoir in year 2003 and that might broaden and deepen the Yangtze River and the tributary of Three Gorge, will greatly slowdown the flow velocity to change hydrodynamic conditions. This changes Influence the Water Environment of Yangtze River and the tributary of Three Gorges Reservoir, especially eutrophication and algal bloom of the tributaries in Three Gorges Reservoir in recent years. For studying the course of algal bloom in the tributaries of Three Gorges Reservoir and the comprehensive prevention countermeasures, about the hydrodynamics of Yangtze River main stream and tributary in Three Gorges Reservoir must be carefully researched. In this article, general situation of the algal bloom of the tributaries in Three Gorges Reservoir were presented, and analysed on characteristics and influencing factors of breakout of algal bloom from certain self-conditions changes before and after impoundment of the Three Gorges reservoir, knowing that lower the nutrient input and improve water flow regime and flow velocity behaviors are the main measures of comprehensive prevention countermeasures of algal bloom in the tributaries of Three Gorges Reservoir; This research status of influence mechanism of hydrodynamic conditions on algal bloom and the research tendency of the tributaries’ hydrodynamic conditions on algal bloom in Three Gorges Reservoir were reviewed, which provided certain theory reference for study and prevention countermeasures of algal bloom in the Three Gorges Reservoir tributaries.
To study the special hydrodynamic characteristic in the estuary of Xiangxi River, this project monitored water temperature and flow velocity both of Yangtze River and Xiangxi River in 2010. In addition to monitoring the water environment of two rivers, a three-dimensional (3-D) hydrodynamic model was also applied. By utilizing both field data and a numerical model, a more holistic view of the 3-D thermal density currents was discovered than by using either method alone. The results of the study showed that the invasion form of water from Yangtze River changed along with the variation of differences in water temperature between two rivers. The invasion water influenced the flow field and thermal field distributions in the estuary of XXR: The farther away from the river mouth, the thermal stratification was stronger and the water temperature horizontal distribution was more uniform. Flow velocity decreased as the distance from the river mouth increased
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