Author(s): Chunjing Liu; Zhenping He; Yu Ren; Leilei Gu; Fei Liu; Xu Geng; Lingfeng Zhang; Yue Chen

Linked Author(s): Chunjing Liu, Yu Ren, Leilei Gu, Fei Liu, Xu Geng

Keywords: Cetian Reservoir; Reservoir Sedimentation; River Bed Evolution

Abstract: The Yongding River is the “Mother River” of Beijing, China. Historically, the Yongding River had a hyper concentration of sediment as famous as the Yellow River. Beijing's safety was at risk because of the floods and the wandering of the river. The Guanting reservoir, built-in 1954 to control the flood of the Yongding River, encountered serious sedimentation problems. The Cetian Reservoir, constructed in 1958, is a large-scale reservoir on the upper reaches of the Yongding River. Besides flood control, it was also built to accumulate sediment from upstream. Since the 1990s, the lower reaches of the Yongding River have dried up, and the ecology of the river has been severely degraded. In 2003, Cetian Reservoir began to release water downstream to restore the Yongding River's ecological environment. Since 2017, Cetian Reservoir has received water from the Yellow River through the Wanjiazhai Diversion Project. It plays an increasingly important role in the environmental restoration to keep the Yongding River from drying up again. This paper introduces the construction and operation of Cetian Reservoir and collects and analyzes the hydrology and sediment data, sedimentation, and remote sensing data. We clarified the relationship between sediment deposition patterns and reservoir operation. We also discussed the impact of human activities on reservoir sediment deposition. At the end of the article, the future sediment deposition situation of the reservoir is prospected to contribute to the safe operation and better functioning of the Cetian Reservoir.

DOI: https://doi.org/10.3850/IAHR-39WC252171192022SS3164

Year: 2022