| Currently part of the rock and soil engineering building near the river, the riverbed evolution and development of engineering construction and engineering safety has a very important influence. The purpose of this paper is based on the natural distribution and a wide range of complex river network type shunt channel change and development analysis, a series of studies on issues related to.In the natural river distributary channel is a common phenomenon. Howev er, distributary channel has a irregular geometry boundary, complex terrain con ditions and the hydraulic factors to determine characteristics, resulting in the ri ver water and sediment movement characteristic and evolution affected by man y factors. It not only has the characteristics of single channel, is due to the di stributary channel is a mutual influence of the system, the water and sediment movement not only common, but also has every diversion channel their own characteristics. As a result, the problem becomes very complicated. Research an d river diversion of river diversion sand rules for the prediction of flood contr ol, navigation, water resources utilization and the ecological environment chang e has important application prospect in engineering, and braided export as a di version channel of the choke, flow and sediment transport in the distribution o f the inlets is to focus on the role of, therefore further research and river dive rsion of braided channel point shunt regularity of sand is crucial.This paper is based on the summary of previous studies, in order to searc h the network type diversion of river diversion sand rules, and three of Jingjia ng diversion points regularity of sand as the main research object is studied in detailed. The full text can be divided into three parts:The first part mainly introduces the previous studies on related issues, incl uding the study of distributary channel flow structure, to shunt and braided riv er diversion shabbethai the score calculation formula of research and of Jingjia ng diversion and sediment research, summarize and analysis the previous resear ch experience and the insufficiency.The second part is the research for shunt three outfalls into sediment. Dat a analysis pointed out that the effect of the main reason for the diversion gateand water level elevation relative changes, in addition to the diversion of som e factors should also be considered, the sediment particle size effect which infl uences three sand the main reason. And to forecast short term Songzi bleeder diversion divided into sand will not change too much, the future may increase a little; Taiping export diversion ratio will keep decreasing trend, due to scou r development trend gradually weakened, shunt ratio decreased gradually weake n until equilibrium is reached, diversion of flow and sediment will after a peri od of time tends to be stable; ouchikou short time ouchikou diversion and sedi ment will remain basically unchanged.In the third part, after the analysis of the structure of the flow, establish considering diversion width along the different water depth, velocity distributio n along the depth of the water, bend circulation, sediment concentration distrib ution along the depth of the diversion ratio, sediment diversion mode and the formula structure analysis, think circulation caused by sand additions will make increased in the sediment content in the branch, to the influence of inlet dive rsion and sediment of several important factors were also analyzed. |
