Temporal And Spatial Analysis Model Of Dam-break Based On Cellular Automata And Multi Agent Systems

After the dam or other water retaining structures, water retaining objects suddenly burst, the water inrush occurred by the formation of the flood discharge is usually called the dam-break flood. Dam-break flood may form strong impact damage to the downstream region in a relatively short period of time, which may lead to serious loss of life and property. So it is particularly important that simulation analysis is adopted to carry out risk assessment of dam-break. Because most of the existing studies consider a single static input flow in the construction of the simulation analysis model, it is difficult to deal with the impact of multi-complicating factor in dynamic interactive environment. Therefore, this paper integrated cellular automata and multi-agent system into the "Virtual Geographical Environment, which explore spatial simulation analysis method. Temporal and spatial analysis model of the dam-break flood routing was constructed, and a virtual geographic environment prototype system was developed to implement visual simulation and analysis of risk assessment of dam-break, which can be used to select an appropriate flood-diversion zone as emergency measures. These researches will have great application value for the emergency protection work.This paper firstly analyzed the composition of traditional cellular automata and the data which effect the routing of dam-break floods, designed the transformational rule of the cellular state, then analyzed the scale effect, and focused on the deficiency of the outburst flood evolution based on the cellular automata. Secondly, the multi-agent systems were introduced into the numerical model of the dam-break flood routing. Multi-factors in the dynamic and interactive environment were considered to design these agents’structures. The temporal and spatial analysis model of Dam-break based on cellular automata and multi agent system was used to deal with the effects of dynamic and complicated simulation process. Then the virtual geographic environment of the new generation GIS research framework was used to implement the in integration of the two. Using Visual Studio2005.NET, OpenSceneGraph and osgEarth, a prototype experimental system was developed to support the simulation and analysis of dam-break risk assessment in a interactive virtual environment, the scale effect of the cellular automata model was also discussed in detail. Finally, a case area was selected, and its regional terrain, geographical distribution of population and urban information were analyzed. Several flood-diversion zones were designed. By means of ArcGIS spatial analysis function, simulation analysis and damage assessment experiments were conducted in our prototype system. After comparative analysis of different flood-diversion zone plans were provided, a best scheme can be given to be as a scientific basis for risk assessment and emergency response of dam-break.