Material Transport And Study Of Dynamic Mechanism In The Yangtze River Estuary

Estuary is the area in which fresh water and salt water mix. As the different nature between the two kinds of water, sediment and other substances in the transition region prone to mutations in the quality, either from vertical or horizontal, conditions are extremely complex. Estuary is also the most active zone in which various processes interactions between the atmosphere, hydrosphere, lithosphere and biosphere, is also a regional in which material, energy and information exchange directly in frequency and intensity. Sediment carried by rivers to the estuary has far-reaching significance for global life and material cycle, at the same time, a variety of nutrients, organic substances and pollutants in the sediment carried by rivers will have a major impact to the estuarine areas of the ecological. As people develop estuarine and coastal increasingly in-depth, it has been increasingly recognized that, coastal zone play an important role in the global material cycle and climate change, hydrology and estuarine water power, ecosystems in its Watershed play an important role in the material exchange among the ocean water, sediments, the atmosphere and land, Rivers carry sediment to the estuary and transport Along the coastal, Affect the evolution of coastal topography. Thus study on the mechanism of the material in the estuary, has Gained a lot of the attention of scholars home and abroad.According to statistics, about 60% of the world's population living in coastal areas, there are two-thirds of large and medium cities more than 1.6 million people located in the coastal, about 90% of fish caught from the area and volume respectively accounted for only 8% of the world's oceans and 0.5% of the offshore. Because the impact of human activities (fertilization, dam, diversion, land use, urbanization, industrial production, sewage, etc), makes the ecological environment sharp deterioration in the coastal zone of human survival (Estuary to the shelf-slope break belt), changes of substance carried by rivers into the sea has disordered, marine living resources are threatened and even destroyed, these has become one of the prominent issues on global change, for these, The international community set up a Research Program called"Land-Ocean-Interactions in the Coastal Zone"(LOICZ,1993-2012). It focused the study area(area between the 200m above sea level and 200m below the sea level) is a regional in which land, marine and atmospheric converge and interact. Its overall objective is to determine the dynamic mechanism of interaction in the regional and global scales, how it that components'changes of the earth system affects coastal zone and change its role in the global cycle, assess how the future changes in coastal zone affect human use of it, As well as provide a solid scientific basis for sustainable use and integrated management to coastal zone.In this paper, references to other documents on the basis of relevant research, calculate and analyze the sediment transport and other aspects about Chang jiang river Estuary and Hang Zhou Bay. According to velocity, suspended sediment concentration, COD, ammonia nitrogen, active phosphate, water depth measurement data and other relevant timing data on the 12 synchronization stations of two consecutive tidal times in the area, using the method of Mechanism of decomposition decompose the 12 stations'dates first, then calculate the suspended sediment content and a variety of pollutants'transport rate and direction of the site, analyze the different characteristics of water and sediment transport in different regions, make a detailed analysis about the distribution of the trend, the average velocity distribution in a tidal cycle and the characteristics of remaining flow.