Abstract
Three gorges hydropower, the biggest hydropower project in the world at present, is a backbone project for flood control and water power development of Yangtze river. From the flood season in 2008 with the beginning test impounding to 2012 has been implemented for five years, that water level has been continue to rise to 175m during 2010 to 2012. After the impoundment to normal water level, backwater is near Jiangjin during dry season with water level of 175m and is nearby Changshou in flood with water level of 145m, then Changshou upstream is the fluctuating backwater region. In this paper, based on a large amount of measured hydrologic data with Zhutuo, Cuntan, Qingxichang and Beibei, Wulong hydrological station on fluctuating backwater region, firstly suspended sediment inflow changes is analyzed, secondly suspended sediment characteristics is studied from the grouping sediment content and gradation change along the river in experimental impounding, then suspended sediment basic characteristics is gained about varying backwater region.
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