The Dynamic Expression Study Of Meteorological Thematic Field Based On Coupling Spatial Information Technology With Atmosphere Diffusion Model

Atmospheric pollution accidents have great impact on ecological environment and people’s living, which seriously restrict the development of social economy. If the meteorological data collected are used to forecast accidental pollution, simulate the diffusion of pollution gas, it will be helpful to make emergency response decision in time, and will be beneficial to solve the atmospheric environment pollution problem. The dynamic expression of meteorological thematic field is the main means for simulating atmospheric pollution accidents. Because the spatial information technology has superior means of data collection and analysis management mode, which also has a high degree of flexibility and compatibility, if we combine spatial information technology with atmosphere diffusion model, that will be a good choice for using the advantage of each other to express the meteorological thematic field.In order to meet the needs of the atmospheric pollution diffusion simulation, the paper has studied how to couple the spatial information technology with the atmospheric diffusion model, discussed and realized the information extraction and expression method of meteorological thematic field based on coupling technology. The strong expansibility has been used to integrate with different technologies, that makes the research more practical. In the last part of paper, a dynamic response system for sudden pollution accident based on the dynamic expression of meteorological thematic field has been constructed, which systematizes the study result, and gets better effect.In this paper, the main work and research results are as follows:(1)A technical route for the dynamic expression of meteorological thematic field has been designed by combining spatial information technology with atmosphere diffusion model, it has been respectively described how to couple spatial information technology with atmosphere diffusion model from data level and technology level, and the dynamic expression of meteorological thematic field has been evaluated based on the coupling framework.(2) A method of extracting information for meteorological thematic field has been described, it has been explained successively how to monitor the meteorological data collection and meteorological data model in real-time, how to use the atmosphere diffusion model to get data model, and how to use the spatial algorithm to get data expression, the new elements of expression are extracted by spatial analysis after the association between meteorological information data and geographic information data has been built.(3) A technology of expressing information for meteorological thematic field has been described, the basic data format specification of WKT and the data interaction between different modules have been designed and realized, a background of expression which merges multi-source spatial information has been constructed, after that, the risk field, overpressure field and thermal radiation field have been expressed on the background, and the 3d slice has been used to express the wind field and concentration field, in order to enrich the content of expression, the different analysis data have been expressed in the most suitable form according to the properties.(4) Based on coupling the spatial information technology with the atmosphere diffusion model for the dynamic expression of meteorological thematic field, a dynamic response system for sudden pollution accident has been designed and realized, which has locale simulation and decision support. It validates the usefulness and effectiveness of the expressing method.