Author(s): Yanjie Liang, Qiushi Luo, Jian Fu, Cuixia Chen

Linked Author(s): Yanjie Liang, Qiushi Luo

Keywords: Water-sediment regulation; Reduce siltation; River channel for middle flood; The incoming sediment amount of the Yellow River;

Abstract: Due to the large amount of incoming sediment, the effective storage capacity of the reservoir will be reduced by sediment deposition and the reservoir function will be affected. The reasonable water-sediment regulation can slow down the sedimentation speed of reservoir, keep the long-distance sediment transport capacity of the downstream river channel. Dongzhuang reservoir is an important flood control and water-sediment regulation project of the Yellow River tributaries. It can be used for sediment storage and water transfer, and reduce siltation in the lower Weihe river. According to the water-sediment regulation application of Dongzhuang reservoir, the 1D unsteady water-sediment mathematical model is adopted to calculate the different scheme of water and sediment series. The results showed that the application of Dongzhuang reservoir played significant effect on sedimentation reduction in the lower Weihe river, maintaining and recovering the discharge capacity of river channel for middle flood, reducing the flood level of the river channel effectively, and reducing the incoming sediment amount of the Yellow River. The water-sediment regulation of Dongzhuang reservoir can reduce deposition in the lower Weihe river. Under different water and sediment conditions, the sedimentation accumulative amount of lower Weihe river is reduced by 5.99~7.16×108t and the sedimentation is reduced by 59.5%~69.8%. The water-sediment regulation of Dongzhuang reservoir can maintain the discharge capacity of the middle water channel in the lower Weihe river at over 2500m3/s for a long time, and the flood discharge capacity of river channel can increase to 3000 ~ 4000m3/s quickly in the early stage of the reservoir.

DOI: https://doi.org/10.3850/38WC092019-0818

Year: 2019