WebGIS在非重气云扩散模拟中的应用

将计算机技术、网络技术和地理信息系统技术相结合，建立了一套基于Internet的B/S模式网络地理信息系统（WebGIS），利用该系统根据非重气云扩散的高斯（Gaussian）模型对瞬时泄漏和连续泄漏两种事故类型的气体扩散情况进行了图形模拟。模拟结果通过在电子地图上绘制出气体浓度等值线的方式，可视化显示出发生泄漏事故后泄漏源周围的气体浓度分布状况及其对周围环境的影响情况。通过工程实例验证了系统的可行性并展示了系统的运行效果。该系统通过将地理信息系统与气体扩散的模拟模型相结合，形象、直观地模拟出危险非重气体泄漏后的影响范围，为非重气体的日常管理、事前预测和事故时的应急指挥等提供了专业化的信息支持。

Application of WebGIS to Non-heavy Gas Cloud Diffusion Simulation

A B/S model web geographic information system (WebGIS) can be set up by integrating computer technology, internet technology and geographic information system. With the application of Gaussian model, the diffusion of non-heavy gas cloud, taking place in instantaneous leak and continuous leak accidents, was simulated in the WebGIS system. By showing the concentration contours of leak gas on an e-map, the distribution and the influence of the gas around the leak source can be visualized. Finally, an engineering case is applied to verify the feasibility of the system and the operation result of the system is shown. It can be concluded that professional information support can be provided to the daily management, accident prediction and emergency planning of the non-heavy gas via combining GIS with numerical simulation of non-heavy gas diffusion.