三峡蓄水后城陵矶水位变化初步研究

近50年实测水沙资料分析表明，城陵矶水位变化取决于螺山-汉口河段冲淤量．三峡蓄水后，螺山-汉口河段冲淤量又取决于宜昌下泄和宜昌-城陵矶河段冲起的粗沙量（d〉0．085mm）及汉口（扣除汉江）粗沙输沙量．通过估算三峡蓄水后宜昌-城陵矶河段粗沙冲刷量和汉口（扣除汉江）粗沙输沙量，表明螺山-汉口河段最大冲刷约9．5×10^8t，螺山流量为10000-60000m^3／s时，城陵矶水位下降约1．26-0.32m，并且随着螺山流量的增大，城陵矶水位下降幅度减小．

Preliminary Study on the Changes of Water Level at Chenglingji Station after the Impoundment of the Three Gorges Project(TGP)

By analysing field data of the last 50 years, it was found that the changes of water level at Chenglingji station depended on the erosion or deposition volume of Luoshan-Hankou reach. and after the operation of TGP,the erosion volume of Luoshan-Hankou reach came down to discharge of coarse sand (d>0.085mm) from Yichang station,Yichang-Chenglingji reach and Hankou (excluding Hanjiang ) station.Through estimating the erosion amount of coarse sand from Yichang-Chenglingji reach and the discharge of coarse sand from Hankou (excluding Hanjiang) station,it is found that the maximum erosion amount of Chenglingji-Hankou reach is 0.95 billion tons.When the discharge at Luoshan station is 10000-60000 m~3/s,the water level at Chenglingji will drop by 1.26-0.32m from before the operation of the TGP.Moreover, the decline of water level at Chenglingji station will decrease as the discharge at Luoshan increases.