Page - 358 - in Book of Full Papers - Symposium Hydro Engineering

Qi Fudong (1996). A discussion on the bar sedimentation in Zhexi Reservoir and its controlling measures. Journal of Hydroelectric Engineering, (7):71-78. Shen Jinshan, Zhu Zhenmei, Zhang Xinqin (1983).Origin and evolution of the entrance sandbars in the south passage of the Changjiang River estuary. OCEANOLOGIA ET LIMNOLOGIA SINICA, 14(6):582-590. Wang Ting, Chen Shukui, Ma Huaibao and Zhang Junhua (2011). Distribution of deposition in Xiaolangdi Reservoir. Journal of Sediment Research, (5): 60-66. Wang Yangui and Hu Chunhong (2003). Study on sedimentation and the mouth bar control in Guanting Reservoir. Journal of Sediment Research, (6): 25-30. Wu Hualin, Shen Huanting, Hu Hui, Zhang Lili and Huang Qinghui (2002). GIS supporting study on calculation of the amount of siltation and erosion in mouth bars of the Changjing Estuary. ACTA OCEANOLOGICA SINICA, 24(2): 84-93. Yang Shilun, Zhao Qingying, Ding Pingxing and Xie Wenhui (2001). Seasonal changes in bed level of the passage in the mouth bar area of the Yangtze (Changjiang) River. Resources and Environment in the Yangtze Basin, 10(3): 258- 265. Zhang Yanjing, Zhang Shiqi and Chen Jinrong.(2003). Numerical simulation on dredging channel of Guishui River mouth bar of Guanting Reservoir. Journal of Sediment Research, (1): 45-51. SUMMARY Using multiple regression analysis and dimensionless parameters, this paper established a response formula between the height’s increment of the sand bar in the tributaries in the Xiaolangdi Reservoir area and a number of influencing factors: water and sediment conditions, terrain factors in the main channel and tributaries and local flow regimes and so on. And also a similar formula between the sedimentation quantity in the tributaries and the influencing factors was obtained. The results show that: the water and sediment conditions, terrain factors, local flow regimes, grain size of bed material were all influencing factors for the evolution of the sand bar. Throughout sensitive analysis, the key factors for the evolution of the sand bar is the flow discharge and local flow regimes. These conclusions will be helpful for the engineering projects to control and limit the evolution of the sand bar in the tributaries in the Xiaolangdi Reservoir area. 358