| In this paper, applying mix element numerical calculate method by the help of the Americal army engineer Corps Waterway Experimental station and Brigham - Younger University, studying and exploiting numerical calculate software TABS-MD, main using in seaport and riveroutlet, transplanting on Songhuajiang river. Its channel is mild and board - shallow, established two dimensional unsteady hydrodynamics numerical model. It proved the selection of roughness coefficient should depend on water depth considering the channel plant cover and geological situation.The roughness coefficient situates in 0.0235 -0.080.dynamic viscosity have little effect on the result of model calculating, and its range is 1200-10000 to four number of one node, calculating result is satisfy stabilization and accuracy . It proved that Finite Element Method suit on establishing two -dimensional numerical simulation model for mild board-shallow river. Channel.Numerical model can save a lot of previous expenditure. Expecially,it is much useful for one model , can provide complete detail calculating data . Furthermore , model can give out the distribution of currentvelocity. Especially,near the building, it can provide the fundamental research condition for project plan and design environmental pollution model and sediment movement model. It can rehearse migration regulation of river channel and explain its cause.Applying the model in the plan and design of flood control project, optimum seeking for many plan that have been worked out.
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