Study On Google Earth-based Visualization Of Storm Surge Flood Routing

Since the great harmfulness of storm surge disaster to the social and economic development, analyzing flood routing process of storm surge disaster is greatly significant for social-economic development planning in costal area. Therefore, employing Google Earth software, WebGIS technology framework and VC++ programming, taking Binhai New Area as a case, the study on dynamic visualization system of storm surge flood routing based on Google Earth is carried out in this paper. The main contents and achievements are as follows:(1) The method of ArcGIS and Google Earth-based digitalization of tidal defense engineering data is proposed. Therefore, not only the digital model of terrain, topography of Binhai New Area, seawall and other tidal defense engineering are established, but also the corresponding geographic information database can be imported and integrated into Google Earth. Meanwhile, based on SketchUp, 3DMax and AutoCAD software, three-dimensional visualization of seawall and other tidal defense engineering, and their effective coupling with satellite remote images and aerial images are achieved, which can reflect the buildings and their appearance intuitively.(2) Digital model of storm surge flood routing and calculation model of breach inflow in the case of dike-break and wave overtopping are established. By employing GIS-based 3D terrain model of study area and seed spread algorithm, a simulation method of storm surge flood routing with an arbitrary breach is presented. The method can not only consider the change of breach in practice, but also realize the dynamic visualization of flood routing process.(3) An overall framework of dynamic visualization system of flood routing process is designed. System modules are developed by using MFC to solve technical problems such as embedment of Google Earth view into the system, interactive locating of seawall breach and the implement of seed spread algorithm. Dynamic visualization of flood routing process and interactive query of submerged area and water depth are achieved through documenting KML files. Furthermore, its application to Binhai New Area is done to provide the decision-making support for costal seawall design and storm surge flood prevention and mitigation.