Study On The Riverbed Evolution Of River Node Effects

River node including two kinds:natural node and artificial node. In practical projects to satisfy the needs of production and life of human, a lot of artificial node engineerings were built. The existence of node projects, will directly influence its surrounding local and nearby the water and sediment characteristics of riverbed erosion and deposition, thus affecting the river's ecology, penetrate-strait security and flood control embankment. Therefore, the research on the artificial node on river bed deformation affected has the important practical significance.However, in penetrate river culvert is chosen in the water diversion project frequently. On one hand, Culverts can diverse water as a penetrate river structures. On the other hand, culverts can work as nodes to change the upstream water flow lines and sediment transporting, and then affect the riverbed situation. Therefore, this text mainly research and analysis on the culvert crossing rive.This article Based on the physical model method, having ZhangHe penetrate river culverts as a background, In forbidden broadening channels which with two different kinds of hole crest elevation, conduct a culvert test with Round, trapezoid, box type three section. Test achieved some results:In terms of water level, get the results of roof height by two of the three culvert size bed level of cross-strait relations, the maximum water level elevation location, extent and scope of the backwater upstream of riverbed and the relationship between the rive without culvert of the water level; In terms of horizontal velocity, compared the size of the every section of horizontal velocity, transverse velocity distribution curve shape, river mainstream line position and the changes of the velocity near the welcoming before and after the construction of culverts; In terms of erosion, get upper reaches of the river bed in each section and the characteristics of the river bed local deformation, giving the corresponding protective measures. The conclusion can provide certain reference for the penetrate river culverts section choice and the design of culvert roof.