基于空间扩散模型的重金属污染源位置的研究

Locating Heavy Metal Pollution Sources Based on Spatial Diffusion Model

基于GIS软件ArcMap对研究区域内的重金属元素浓度的空间分布进行可视化分析。通过设计各金属污染负荷指数并结合Hakanson毒性模型,利用层次分析等数据挖掘方法确定重金属元素的权重,客观高效地确定不同功能区内的综合污染指数,基于具有自修正特征的迭代算法,对每种重金属元素的污染源位置进行了仿真,结果显示该反演模型是收敛的。

The spatial distribution of heavy metal elements＇ densities in the given area was visualized by ArcMap supported by GIS technique.By designing pollution load indexes of different heavy metals and combining Hakanson toxicity model,the comprehensive pollution indexes of different zones were determined through Analytic Hierarchy Process（AHP）.The spreading features of heavy metal pollutant were helpful to build diffusion model of heavy metal elements in the soil and work out the probability matrix of each sample point＇s possibility to become the pollution source.In order to simulate locations of heavy metal pollution,spatial diffusion probability model was established on condition that a self-repairing iterative scheme based on regularization was created to visualize the pollution source of every given heavy metal element.