PIANC Smart Rivers 2022

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Abstract : *(250~1000 words)

Water level changes in the middle Yangtze River are important for flood control and navigation. Based on the hydrological data of middle Yangtze River from 1986, this paper analyzed the changes of stage-discharge relationship. The trend of water level change is studied by Mann-Kendall analysis method, and the main influencing factors of water level in different reaches at different time scales are studied quantitatively. The results show that: on a long time scale (during several years), the fluctuation of water level caused by the change of river bed scour and water diversion ratio is more obvious. For example, compared with the water level before the completion of TGR, the cumulative decrease range of water level at Shashi station was 1.86m at 6000m3/s and 0.74m at 14000m3/s in 2014, and the water level of the main stream of the Yangtze River increased by 0.14m due to the decrease of diversion ratio of the three outlets of the Jingjiang River. On a short time scale (during several hours), the fluctuation of water level caused by reservoir scheduling and inflow or outflow of anabranches is more obvious. For example, due to unsteady flow from daily regulation of power station, the daily fluctuation range of water level near TGR such as yichang station and Zhicheng station is greater than 0.3m and 0.1-0.3m, respectively. The water level of the lower reaches of Zhicheng is mainly affected by inflow or outflow of anabranches, and the intensity of the influence decreases with the increase of the distance between the reach and the branch. Due to the Yangtze river to the Hanjiang river diversion works, the water level of Shashi station decreased by 0.23~0.29m in middle high water stage and 0.05~0.19m in dry water stage. The maximum water level of Jianli station increased by 3.3m in flood season and 3.1m in dry season due to the inflow of Dongting Lake.  The maximum water level of Jiujiang station increased about 3.2m in flood season and 4.6m in dry season due to the inflow of Poyang Lake.

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