Based on the desilting research of one scheduling project in the southwest of China, the method of setting grid desilting gallery before the desilting tunnel is put forward to expand the scope of the scouring funnel b...Based on the desilting research of one scheduling project in the southwest of China, the method of setting grid desilting gallery before the desilting tunnel is put forward to expand the scope of the scouring funnel before the dam and solve the problem of sediment deposition at the power station water intake. The experimental results show that, in the design of a grid desilting gallery, the width of the grid gallery should not be smaller than that of the desiring bottom intake, the size of the grid orifice should be in the range of 1.5 m--2.0 m along the flow direction, and the grid spacing should be 3--5 times the size of the grid orifice. The discharging ability of the desilting bottom intake will decrease after the grid desilting gallery is added. The average of the decrease rates is about 5%-10%. The scouring funnel draws in the longitudinal direction before the dam obviously after the construction of the grid desilting gallery.展开更多
Sediment research of TGP has been carried out for more than 40 years since 1958.This paper briefly describes the sediment research work of Yangtze River Scientific Research Institute in the reservoir area and damsite ...Sediment research of TGP has been carried out for more than 40 years since 1958.This paper briefly describes the sediment research work of Yangtze River Scientific Research Institute in the reservoir area and damsite area of TGP in recent years.The research results demonstrate that sediment from Jinsha river and Jialing river reaches 83% of the total sediment at TGP.The completion of Xiluodu,Xiangjiaba and Tingzikou reservoirs will postpone the initial sediment balance time in TGP reservoir. In initial operation period of the project,the sediment in approach channels of the navigation structures can be cleared by machinery,in future period,the sediment outside the entrances of the upper and lower approach channels still need to be cleared by machinery while the sediment within the approach channel should be cleared by joint measures of flushing and mechanical dredging.展开更多
基金Supported by National Key Technology R&D Program during the11th Five-Year Plan Period of China (No.2006BAD11B03)
文摘Based on the desilting research of one scheduling project in the southwest of China, the method of setting grid desilting gallery before the desilting tunnel is put forward to expand the scope of the scouring funnel before the dam and solve the problem of sediment deposition at the power station water intake. The experimental results show that, in the design of a grid desilting gallery, the width of the grid gallery should not be smaller than that of the desiring bottom intake, the size of the grid orifice should be in the range of 1.5 m--2.0 m along the flow direction, and the grid spacing should be 3--5 times the size of the grid orifice. The discharging ability of the desilting bottom intake will decrease after the grid desilting gallery is added. The average of the decrease rates is about 5%-10%. The scouring funnel draws in the longitudinal direction before the dam obviously after the construction of the grid desilting gallery.
文摘Sediment research of TGP has been carried out for more than 40 years since 1958.This paper briefly describes the sediment research work of Yangtze River Scientific Research Institute in the reservoir area and damsite area of TGP in recent years.The research results demonstrate that sediment from Jinsha river and Jialing river reaches 83% of the total sediment at TGP.The completion of Xiluodu,Xiangjiaba and Tingzikou reservoirs will postpone the initial sediment balance time in TGP reservoir. In initial operation period of the project,the sediment in approach channels of the navigation structures can be cleared by machinery,in future period,the sediment outside the entrances of the upper and lower approach channels still need to be cleared by machinery while the sediment within the approach channel should be cleared by joint measures of flushing and mechanical dredging.
