Riverbed Evolution Analysis Of The Xi Zhuchang Bridge Section Of The South Ming River

River channel evolution is the result of the flow and river interaction, butnatural and man-mad factors,such as,built dams on the river、land reclemation、river sand and fix the buildings will change the original state and balanceconditions, in order to make the riverbed evolution more rapid and intense. Withthe rapid development of economy in our country, the construction of highwaynetwork is experiencing earth-shaking changes, in order to solve the connectionproblem of road across the river and across the ocean, highway bridge、railwaybridge will be construct with a great number.Studying the rule of large-scale bridge which is in the river channel, it hasgreat significance to the bridge safety、flood control and channel management.The essay is based on309national highway of wuan city south Ming Riverbridge as the research object. It studied the riverbed evolution rule of xizhuchangsection of the Southern Ming River and the influence after constructing. In theriverbed evolution analysis, fist,analysis from the historical evolution and statebased on the raw mateial, second, find out the main factors of the riverbedevolution to grasp the rule of sediment of the channel, the last one, according tothe test data of river model of the reach of the development and trend in the futureto make certain prediction.According to the south Ming Rver’s meteorological hydrology, storm floodcharacteristics, topography, the existing situation of water conservancy projectsand related planning and traditional stack code is used to contrast with themodern drawing software CAD method of combining the research the historicalchange characteristics of the river.,which analysis the sediment characteristics ofthe south River Ming in the1960s, and the evolution profiles of the riverregime,characteristics of the cross-sectional and longitudinal,the situation of riverdevelopment. On the basis of previous normal movable bed model test results, itanalysis the influence of the water level changes、river erosion and the flowvelocity before and after change,besides, it analysis the riverbed evolution andforecast the trend of riverbed evolution in the future.