Floods are both risks and resources. Floodwater utilization is an important part of flood management. Considering the rising shortage of water resources, serious water pollution, and undersupply of electric power, it...Floods are both risks and resources. Floodwater utilization is an important part of flood management. Considering the rising shortage of water resources, serious water pollution, and undersupply of electric power, it’s imperative to strengthen flood management. In light of the hydrological characteristics of the Three Gorges Project (TGP) on the Yangtze River in P. R. China, we investigated the necessity and feasibility of TGP floodwater utilization, proprosed dynamic control of limited water level during flood season of the reservoir and basin-wide integrated floodwater management as strategies, and identified problems that might occur in practice.展开更多
PM2.5 pollution in sive attention in recent years, Beijing has attracted extensive attention in recent years, but research on the detailed spatiotemporal characteristics of PM2.5 is critically lacking for effective po...PM2.5 pollution in sive attention in recent years, Beijing has attracted extensive attention in recent years, but research on the detailed spatiotemporal characteristics of PM2.5 is critically lacking for effective pollution control. In our study, hourly PM2.5 concentration data of 35 fixed monitoring sites in Beijing were collected continuously from October 2012 to September 2013, for exploring the diurnal and seasonal characteristics of PM2.5 at traffic, urban, and background environments. Spatial trend and regional contribution of PM2.5 under different pollution levels were also investigated. Results show that the average PM2.5 concentration of all the 35 sites （including 5 traffic sites） was 88.6 μg/m^3. Although PM2.5 varied largely with the site location and seasons, a clear spatial trend could be observed with the PM2.5 concentration decreasing linearly from south to north, with a gradient of -0.46 μg/m^3/km for average days, -0.83 μg/m^3/km for heavily-severely polluted days, -0.52μg/m^3/km at lightly-moderately polluted days, and -0.26 μg/m^3/km for excellent-good days. PM2.5 at traffic sites was varied, but was generally over 10 % higher than at the nearby urban assessment sites.展开更多
基金Funded by National Key Technologies R&D Program (2008BAB29B09)Open Foundation of State Key Laboratory of Water Resources and Hydropower Engineering Science (2007C017)China Postdoctoral Science Foundation (20080440956)
文摘Floods are both risks and resources. Floodwater utilization is an important part of flood management. Considering the rising shortage of water resources, serious water pollution, and undersupply of electric power, it’s imperative to strengthen flood management. In light of the hydrological characteristics of the Three Gorges Project (TGP) on the Yangtze River in P. R. China, we investigated the necessity and feasibility of TGP floodwater utilization, proprosed dynamic control of limited water level during flood season of the reservoir and basin-wide integrated floodwater management as strategies, and identified problems that might occur in practice.
基金supported by the Key Research Program of Chinese Academy of Sciences (KZZDEW-13)the Gong-Yi Program of Chinese Ministry of Environmental Protection (200909016, 201209008)+1 种基金the National Natural Science Foundation of China (21377127, 41201038)the President Fund of University of Chinese Academy of Sciences (UCAS)
文摘PM2.5 pollution in sive attention in recent years, Beijing has attracted extensive attention in recent years, but research on the detailed spatiotemporal characteristics of PM2.5 is critically lacking for effective pollution control. In our study, hourly PM2.5 concentration data of 35 fixed monitoring sites in Beijing were collected continuously from October 2012 to September 2013, for exploring the diurnal and seasonal characteristics of PM2.5 at traffic, urban, and background environments. Spatial trend and regional contribution of PM2.5 under different pollution levels were also investigated. Results show that the average PM2.5 concentration of all the 35 sites （including 5 traffic sites） was 88.6 μg/m^3. Although PM2.5 varied largely with the site location and seasons, a clear spatial trend could be observed with the PM2.5 concentration decreasing linearly from south to north, with a gradient of -0.46 μg/m^3/km for average days, -0.83 μg/m^3/km for heavily-severely polluted days, -0.52μg/m^3/km at lightly-moderately polluted days, and -0.26 μg/m^3/km for excellent-good days. PM2.5 at traffic sites was varied, but was generally over 10 % higher than at the nearby urban assessment sites.
