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clear8511
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2Â¥2009-06-14 15:04:35
lixiaod001
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| Analysis by comparing the upper reaches of the Yangtze River Hydrological Station Cuntan warehousing, storage section of Wujiang Wulong, Yichang hydrological station of the Treasury, as well as hydrological stations Chase into the sea for many years an average of years 1956-2000 and 2004-2005, the characteristics of the measured value of water and sediment, total phosphorus content, combined with adsorption indoor simulation experiments, the Three Gorges reservoir area on the storage process of suspended solids, total phosphorus retention effect, as well as middle and lower reaches of the Yangtze River as a result of suspended solids to reduce the suspended solids caused by phosphorus adsorption and sedimentation of the weakening of the ability to carry out a study analysis. The results show that: (1) of the Three Gorges Reservoir on the apparent effects of sediment retention, water storage, after 2004-2005, the Yichang section of sediment retention rates were 65% and 69%, the annual volume of sediment retained 119 million tons, respectively and 181 million tons; (2) of the Three Gorges Reservoir, the Three Gorges Reservoir on the phosphate segment with very high self-purification, from Cuntan to Yichang, the average concentration of total phosphorus decreased by 37.5%; At the same time, the middle and lower reaches of Yangtze River the role of self-purification of the total phosphorus load reduction is far lower than the total phosphorus load to the River, the Three Gorges reservoir area from the Yichang section of the Treasury to the Chase section into the sea, the average total phosphorus concentration increased by 20.0% (3) on the one hand, of the Three Gorges Reservoir suspended solids and total phosphorus retention have a high percentage of on the other hand, to reduce the suspended solids as a result of the lower reaches of the total phosphorus adsorption caused by the reduction of settlement, combined with middle and lower reaches of the Yangtze River suspended matter on phosphate adsorption indoor simulation results, with the Three Gorges Reservoir water flux of the Yangtze Delta affect the amount of total phosphorus were 38,222.1 tons (2004) and 35,758.2 tons (2005). |
3Â¥2009-06-16 09:40:57














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