Studies On Qingyazi Waterway Regulation In Fluctuating Backwater Area Of Three Gorges

Under natural conditions Qingyanzi low water channel are deposition area in flood season,The Shoal will be obstruct the navigation prone in dry season?Qingyanzi waterway is the Yangtze River's famous rapids in dry Shallow,The minimum channel width is 180 m,the minimum channel depth is 2.5m,the minimum bend radius of waterway is 530 m.After the completion of the Three Gorges Reservoir Sailing in the river reach will face a difficult situation.Because the right Branch of Jinchuan moraine located in fluctuating backwater area will be blockage as the growth of the reservoir operation time,and left branch reef clouds.Therefore,Experimental study is necessary for engineering measures to improve navigation conditions of Qingyanzi reach.In this paper,the similar engineering experience at home and abroad are summarized.And the flow structure,sediment movement,riverbed erosion and Channel conditions change in Qingyanzi reach were studied around the Three Gorges Reservoir.The results indicate that the sediment cumulative deposition would cause propylene river channel condition seriously deteriorated in the early reservoir due to the right branching channel silt shallow and left branch steep water flow urgent.Reach for Qingyanzi left and right branching Regulation Scheme tests showed: Right Branch regulation scheme has a significant effect.This scheme broaden the waterway,the guide along the flow,reduce flood season sedimentation,and increased erosion intensity of Fluctuating by damming and dredging the combination of measures.This scheme can be used for design guidance.Meanwhile,the influence of Three Gorges reservoir flood season precipitation to Qingyanzi river navigable condition were studied,Research available to reservoir flood season precipitation Optimal Reference.In this paper,the Obstructs the navigation characteristic of Qingyanzi river were analysised and researched,By prototype observation,data collection and sediment simulation test method of combining.And regulation measures were proposed,its provide technical support and scientific basis for Qingyanzi Waterway Regulation Engineering Design.This study may be provide a reference for governance of river reach similar to fluctuating backwater area of Three Gorges.