Research On Cross River Cascade Hydropower Stations Hydrological And Water Quality

For the sake of adapting to the needs of economic and social development and with the core of ecological environment construction and economic and social development as a core,Based on the study section (including tributaries), water quality, water hydrology, water pollution, industrial and agricultural water use and water ecological environment factor investigation and monitoring, analysis and evaluation of present situation of water environment, combined with the operation mode of cascade hydropower plants, hydropower cascade development of hydrology, water quality (temperature) changes, prediction and evaluation of cascade joint operation may bring the water environment impact of cascade power stations, the effect on water quality in reservoir area should pay special attention to the city, township centralized pollution sources on the water environment impact.Through the field investigation, collection of various data needed. According to the regional topography, geomorphology and natural geographical conditions, the project development and building layout features, using the measured1/2000and1/200river channel topographic maps of large section, combining with the model test results, the cascade hydropower stations may be constructed on river water, water, water level, flow pattern, velocity of flow, sediment concentration change situation analysis. The cross river cascade was built on the entire watershed of various aspects of the impact, the comparative method to analyze the list. Secondly, in order to understand the Yanjin Pu’er City County and town sewage discharge on water quality influence, this evaluation considering the adverse flow conditions (dry season), and the reservoir pollution source is simplified as a point source from reservoir tail left into dry period, on the river water quality model for river water quality prediction and analysis. Using Dillon to forecast the total phosphorus, total nitrogen concentration of Engineering reach distribution, analysis of eutrophication of river conditions and possibilities; has been built on the power station uses the comfortable degree calculation method, analysis of the reservoir on the coast comfort index of human body; the water exchange frequency method on the cascade reservoir stratification type discrimination.The prediction results show that, after the build of reservoir waters area of natural river water area was increased, the area of flow velocity will slow down, make the reservoir area river water environment from the rapids River to hydrostatic model change. The joint operation of cascade hydropower stations on the runoff in a year, it had no effect on the interannual distribution. The two-dimensional steady mixed attenuation model prediction results show that the fish, and DA and swallows slope station was built, as the reservoir depth, surface width increases, the pollutant dilution ability enhances; reservoir flow slowed down, pollutant transverse diffusion speed. Power construction compared to before, pollutants in shorter distance dilution mixture. Finally, aiming at the cascade development on hydrological regimes and water quality impacts, the requirements of the sustainable development, put forward corresponding hydrological situation of protection and water quality protection measures.