The Study And Application On The Mathematical Model Of Flood And Sediment In The Flood Storage

Flood disaster is a serious problem in flooded area. Accompanied by flood, theproblem of sediment deposition is also serious in flooded area. It brings lots ofinconvenience to the resident life. Most of scholars made focus on flood model and floodwater-logging model. But the research about sedimentation was less paid attention to. Theproblem of flood sedimentation which was caused by flood in flooded area was futherstudied in this paper based on the theory of the senior. This paper established themathematical model of Sediment Transport in flooded area.The model consists of Flood Water-logging Hydrodynamic Model and FloodSediment Deposition Mathematical Model. First2-d flow model theory was applied toestablish Flood Water-logging Hydrodynamic Model. It took use of the finite elementmethod of weighted quality concentration to solve2-d flow equation. And meshingtechnique with irregular rules was used in modeling topography and grid partition of thestudied area; After it was debugged by Sepat food date of Fuzhou Universities’ area, theparameters were defined. If the rational boundary conditions were chose, the model couldbe applied in pratical problems. Finally the model was tested by making use of flood dataof Fuzhou Universities’ area during the typhoon of "Long Wang" in2005.A mathematical model of flood sediment transport is established by using2-Dsediment kinetic theory. In order to solve2-D suspended sediment kinetic equation andriverbed deformation equation, the finite difference method of windward unit is appliedin the model. And to fix the model’s design conditions, the uncoupled solving is adoptedand hydrodynamic condition obtaining from flood waterlogging model taken as inputcondition combined with debugging the model repeatedly. Then, the model is verified bytwo groups of sediment material of Fuzhou University City of typhoon floods Longwangin2005and Sepat in2007. The results show that the calculated values coincide with themeasured in certain precision and can simulate the flood sediment case in flood plain well,and so this model has good reliability.Finally the model was applied in the calculation of the program of flood control andwater drainage plan of Fuzhou universities’ area. The calculated results showed the effectof flood control and sediment deposition after the implementation of the different plan. The mathematical model created in this article has certain directive significance.