PIANC Smart Rivers 2022

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The Yangtze River is one of the largest fluvial systems in the world. It is famous for the large water and sediment quantity. In the history of Yangtze, the middle Yangtze River suffered many devastating floods. One of the purposes to construct the Three Gorges Dam (TGD) is to alleviate and regulate the flood in the middle Yangtze River. However, most of the sediments are blocked in the reservoir after the completion of the construction of the TGD in 2003 (Fig. 1). The sediment transports through the TGD decrease dramatically and the erosion happen downstream the TGD, i.e., the middle Yangtze River will erode for a long time in order to get the new equilibrium of the river.The TGD was launched to construct in 1994, and it started to impound the water with the operating water level from 139 m to 135 m in June, 2006. Later the TGD started to run with dam water level from 156 m to 144 m in the primary period. The TGD impounded to the water level of 175 m in November, 2010 and started to run in the operation of 175~145~155 m.
According to the protections in Yangtze River in recent decades and flood disasters in recent years, the paper summarized the achievements in the system of Yangtze River Flood Control. The main weak links available were analyzed for the current situations. The major measures were proposed to improve the capability of flood control and disaster reduction comprehensively in Yangtze River. The paper gave an overview of hydraulic engineering development to guarantee, serve, improve and benefit the livelihood of people. The study can provide great supports to promote the construction of the Yangtze River Economic Belt and to complete the process of fully building a moderately well-off society.

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