基于开源GIS的城市非点源污染负荷模拟研究

Design and Implementation of Urban Non-point Source Pollution Load Simulation System Based on Open Source GIS

随着点源污染不断得到控制,非点源污染在城市水污染中所占的比重逐步增大,通过建立城市非点源污染负荷模拟系统,可以从空间上了解城市非点源污染产生和扩散过程,为治理非点源污染提供数据依据。该研究在借鉴目前城市非点源污染模型与GIS集成应用的基础上,针对商业GIS组件开发成本较高、开放性较差、开发灵活性较弱以及SWMM模型本身空间分析能力弱和空间可视化表达效果差等问题,借助开源GIS组件DotSpatial和MongoDB数据库,实现GIS与SWMM模型的紧密集成,并以MongoDB数据库为数据交互中心管理模型数据,开发出具有开发出低成本、扩展性强、高开放、灵活度高等特点的城市非点源污染负荷模拟系统。该研究选择昆明市东风东路片区作为研究区域,并用实测降雨数据进行模拟分析,结果表明系统具有良好的实用性。

With point source pollution being continuously kept under the control, the proportion of non-point source pollution has increased in urban water pollution. An urban non-point source pollution load simulation system was established to understand the generation and diffusion process of urban non-point source pollution from space, which can provide a basis for controlling the non-point source pollution. The research is on the basis of current urban non-point source pollution models integrated with GIS applications. To solve the shortcomings of commercial GIS component such as high development cost,poor openness, weak development flexibility and poor spatial analysis and spatial visualization of SWMM model, by use of open source GIS component DotSpatial and MongoDB database, the urban non-point source pollution load simulation system has achieved a tight integration of GIS and SWMM model and used MongoDB database as data center to manage the model data, with the characteristics of low-cost, scalable, highly open, more flexible and so on. Taking catchment area in Dongfeng East Road, Kunming as the study area, the actual measured rainfall data was used for the simulations, and the results showed better applicability of the system.