tailieunhanh - Reservoir operation schemes for water pollution accidents in Yangtze River

In addition, developers may earn credits by installing nonpoint pollution controls themselves. The developers may then offer these credits to a sewage treatment authority. By doing so, the authority can avoid costly new facility improvements that would otherwise be needed to accommodate new development and whose cost would ultimately be passed on to the developer and its customers.’ The treatment authorities are responsible for ensuring that the nonpoint source. | Water Science and Engineering 2012 5 1 59-66 doi http e-mail wse2008@ Reservoir operation schemes for water pollution accidents in Yangtze River Xiao-kang XIN Wei YIN Meng WANG Changjiang Water Resources Protection Institute Changjiang Water Resources Commission Wuhan 430051 P. R. China Abstract After the Three Gorges Reservoir starts running it can not only take into consideration the interest of departments such as flood control power generation water supply and shipping but also reduce or eliminate the adverse effects of pollutants by discharge regulation. The evolution of pollutant plumes under different operation schemes of the Three Gorges Reservoir and three kinds of pollutant discharge types were calculated with the MIKE 21 AD software. The feasibility and effectiveness of the reservoir emergency operation when pollution accidents occur were investigated. The results indicate that the emergency operation produces significant effects on the instantaneous discharge type with lesser effects on the constant discharge type the impact time is shortened and the concentration of pollutant is reduced. Meanwhile the results show that the larger the discharge is and the shorter the operation duration is the more favorable the result is. Key words water pollution accident emergency operation water environment model Three Gorges Reservoir 1 Introduction With the development of the economy and natural science research capabilities the water environment and river health have drawn more and more attention Moyle and Mount 2007 . In the Yangtze River Basin of China dozens of water control projects play important roles in power generation water supply water transport and so on. The operation scheme of the Three Gorges Project the largest hydraulic project in China attracts the attention of scientists and the public. The optimal operation scheme of the Three Gorges Reservoir has been studied by taking the .