Calculations Of Designed Water Level And Waterway Regulation Scheme On The Section Of Ding And Mei River Influenced By Regulated Flood Peaks

Ding River which has 38 kilometers in GuangDong province is a main branch of Han river,. Qingxi Hydropower Station was built in December, 1993. This hydropower belongs to a runoff type, in which four generators were installed with a power-generating capacity up to 4×3.6×104 kilowatt, and with a single generator's power-generating flow capacity up to 209m~3 /s. It belongs to a daily regulating reservoir. XiKou Hydrographic Station is located in the downriver, about 4.3 kilometers far from QingXi Hydropower Station and in the downriver of XiKou Hydrographic Station, about 26 kilometers from it, there is SanHeBa Water Level Station. The river section studied is from Chayang Port, which is located in the downriver, about 6 kilometers from QingXi Hydropower Station, to SanHeBa, 26 kilometres from QingXi Hydropower Station.The length of the mainsteam of Mei River is 307 kilometers. The length of the river section from Mei River Bridge, MeiJiang City, to SanHeBa is 82 kilometers. Between them there are four hydraulic terraces. From upriver to downriver, there are XiYang, BingCun, DanZhuWo,and PengLaTan, which all belong to daily regulating reservoirs, and were built and began to generate electricity in 1997,at the end of 2003, in July,2001,and in May, 2002 respectively.By studying how to define and design the water levels of the rivers such as Ding River, Which are seriously affected by regulated flood peaks and have non-base-flow, the paper puts forward the method, that is, the lowest-water-level accumulation frequency. Firstly putting forward such a research method is based on QingXi Hydropower Station, a flood-peak-regulating runoff hydropower station without the guarantee of base-flow. Regulating the flood peaks seriously affects the downriver sections and results in the serious downcutting of water levels. Secondly, the distance between a hydrographic station and a hydropower station cannot be too far. By analyzing this case, we had better keep the distance within 35 kilometers, for such a result corresponds with situation of a hydropower station's regulating flood peaks and generating electricity. As to the choice of the instantaneous flow profile, the paper puts forward that we can make use of the lowest water level which is observed and measured during the hydrographic test according to the corresponding water gauge observing to show the wave trough spreading downward along the river. It is a way to make research, that is, we take advantage of every water gauge corresponding to the water level of the water trough.As to the special river routes, such as Mei River, which has not the base flow for navigation, and can not meet the standardized requirements, the paper puts forward two navigation patterns: we navigate according to water level within the reservoir; we navigate "by making using of the water to sail" in the river sections under the dams. Meanwhile, the paper suggests the higher-level cooperation should be made, led by the State Council or the Development and Reform Commission, followed by the governments such as water conservancy, hydropower, transportation etc. The relevant governmental departments should examine and approve prudently the navigation facilities to see if we can set up hydropower projects on the navigable rivers so as to make good use of the water resources comprehensively.