Mechanism Research Of Water And Sediment Load Variation Interact With Waterway Regulation In Jianli River Reach

Changjiang River, the longest river in our country, has excellent conditions forwater transportation which is known as the Golden channel called. Restrained by partof the waterway, Changjiang River shipping capacity development is also very limited.On one hand, as the three gorges project was completed, 5000-ton vessel and10000-ton fleet could uplink to Chongqing all the year round, on the other hand, theuse of the three gorges project changed the hydrological conditions for thedownstream river reaches, and the corresponding channel adjustments have broughtcertain effects on the waterway conditions.It investigates the channel condition's response to the water and sediment loadvariation in Jianli river reach by theoretical analysis in terms of prototype observationand river model test. Specific research contents can be mainly concluded as follows:Firstly, the changes in law of water and sediment conditions in Jianli river reachwere analyzed systematically, including the spatial pattern, the characteristics beforeand after impoundment of the Three Gorges Project and the variation trendscombining with the effect of the three branches of Jingjiang river reach.Secondly, the river bed evolution, especially the distinguishing feature afterimpoundment of the Three Gorges Project, the bank collapse on Turtle Island'smiddle and distal right edge and the evolution trends.Thirdly, the riverway evolvement after the Waterway project implementation, theflow characteristics of bank collapse by fixed bed model test, and furthermore theexploration on strategies and recommendations of waterway regulation based on thewaterway status and riverway evolvement.In the end, the mechanism of water and sediment load variation and bank collapsecommon interact with waterway regulation.