The River Ecological Restoration Technological Research Of Da Xing Hydropower Station Less Water River In Ya’an Yucheng District

With the development of river systems, there are tow main water systems named Qingyi River and Dadu River, and many tributaries in ya’an territory. There are 131 rivers totaled 3188km with drainage area over 30 square kilometers. The basin contains abundant hydroelectric energy with 16.01 million kilowatts.13.22 million kilowatts installed capacity can be built with the energy. However, after years of hydropower construction, all the development tasks have finished basically. The economic benefits is huge.3.11km less water river was formed as the construction of Da xing hydropower station. It locates within Qingyi River main river in Yaoqiao new district of Yucheng new district in ya’an. Because of less water river formation, original river hydrological regime is changed. It also influences the watercourse ecological landscape and aquatic habits of the reach. Simultaneously, it also has an effect on riparian vegetation available water resulting in the destruction of riparian landscape ecology. Moreover, because of gravel excavation in the less water river, resulting in riverbed exposed and messy riverbed, which creates large destruction of urban landscape, and there is also a security risk.The research purpose of the thesis is that a set of river restoration methods suitable for the less water river can be explored by analyzing less river water present situation.The research will follow the principle of "security" "harmony between man and nature" Engineering measures and ecological restoration measures will be used. Engineering measures includes rubber dam, flood protection and river dredging project, and ecological restoration measures includes water landscape measures and land landscape measueres. From the research, the watercourse can close to natural landscape and maintain river landscape on the basis of completion traditional river remediation task. As far as the less water river problems be concerned, some ecological measures will be used to improve river environment on the basis of engineering measures.