Study On The Full-view Simulation Method Of Ice Flow In Songhua River

As ice flow appears frequently in Songhua River Basin,improving the security in ice flow area and reducing or avoiding risks from ice flow are of great significance.Supported by the hydraulic technological project in Heilongjiang Province titled “study on ice flow process mechanism and embankment protection technology of regulating engineering in Songhua River main stream”,this thesis aims at 3D visual simulation for the ice flow of Songhua River main stream.Based on GIS system and GE software,the digital terrain model swift construction method is studied.Aimed at the problems of none integration of ground-object scene and MIKE21 software computational result and poor intuitivism,GIS 3D visual program developing technology based on ice flow process numerical simulation result is developed,and 3D visual simulation method of ice flow process in Songhua River was established.The contents of this thesis include:(1)A digital terrain swift construction method based on GIS and Google Earth were established as a solution to heavy workload and large amount of data based on the analysis of the 3D visual technology,numerical simulation of ice flow process and system simulation research status.(2)Digital terrain system’s import and integration methodsin embankment structures were developed while considering the 3D modeling precision,efficiency and embankment engineering structures’ feature.Based on CityEngine and the structure feature of 2D vector data,the methods of 3D model importing,remote sensing image fitting and scene rendering were proposed,and 3D full-view simulation integrated method were established.(3)Based on the results of digital terrain processing,geometric models grid meshment and boundary condition was established in MIKE 21 software;the study on digital simulation analysing method of ice flow process was launched for the purpose of ascertaining ice flow moving water surface curve,trail,velocity and water level,etc;the data for 3D visualization simulation in ice flow process was extracted;the coupling method of ice flow process 3D fullview scene and digital simulation visual data in different coordinate system in multisystem was established.(4)Combined with visual simulation system basic theory,the ice flow process simulation system frame,function design,the construction of space database and the property database were developed.Based on GIS,3ds Max and CityEngine,ice flow process scene was established;with Visual Studio development platform,the problems of 3D scene visualization,ice flow process dynamic simulationwere solved;the visual dynamic simulation of ice flow movement path,deposition density and water level were completed,the development of simulation system of ice flow process in Songhua River was finished.