Research On Scheme About Water Quality And Quantity Joint Regulation Of The Emergency Water Supply Project Of The South-to-North Water Transfer Project In Beijing

As a large infrastructure project, the middle route of the South-to-North Water Transfer Project is constructed to solve the serious shortage of water resources in the northern region of China and to optimize the water resources allocation of our country. The project section from Beijing toShijiazhuang, which is prioritized as the emergency water supply project for Beijing, has started transferring water in2008. However, because lack of the plan water quality and quantity joint regulation mechanism, the "yellow water event" of the living water, a threat to part of the drinking water, happened in Beijing at the beginning of transferring water. So, it can be concluded that studying the scheme of water quality and quantity joint regulation has important significance to guarantee the water safety in Beijing.This research is based on the Beijing science and technology project named the security system research of the water quality of the South-to-North Water Transfer Project in Beijing (Zl11100074511005). It firstly describes the actual needs of the municipal water quality safety from the South-to-North Water Transfer project in Beijing in detail. Then it distinguishes the different water quality indexs of different water sources including water source of the emergency water supply project and the local water source. Moreover, it establishes the response relationship between water quality and water quantity of different water sources, in order to put forward the operation scheme and security guaranty mechanism of the water quality and quantity joint regulation.The main conclusions from this research are summarized as follows:(1) The major water-supply sources of the four water plants along the South-to-North Water Transfer Project in Beijing include the source of the emergency water supply project and the local water source of the surface water (Miyun reservoir). According to the analysis of the water quality of different water-supply sources, it shows that all the water quality indexes of the both water-supply sources attain level-II of the Surface Water Environment Quality Standard, except the total nitrogen index of the emergency water supply project. However, some water quality indexes of the emergency water supply project tend worse with distance, such as the sulfate, chloride and nitrate nitrogen.(2) Based on the assumption of physically mixing among different water-supply sources, the response relationship between water quantity and water quality is established using the historical supplied water amount and water quality monitoring data of the four water plants along the South-to-North Water Transfer Project of Beijing from August,2011to July,2012. And the threshold value of sulfate and chloride for the four water plants are analyzed.(3) According to the water quality and quantity response relationship of the four water plants, as well as the actual conditions of the water sources, engineering and water quality of the South-to-North Water Transfer Project in Beijing, the water quality and quantity joint regulation scheme is presented, including the first regulating outside Beijing and the second regulating inside Beijing.(4) Due to the cross-region and cross-branch characteristic of the South-to-North Water Transfer Project in Beijing and its associated projects, the security guarantee mechanism of water quality and quantity joint regulation of South-to-North Water Transfer Project is proposed. The proposed security guarantee mechanism includs the mechanism of coordination and communication, the mechanism of sharing information and resource, and the mechanism of prevention, control and regulation across regions and departments between Beijing and Hebei.