城市表层土壤重金属污染分析优化模型

为了分析城市表层土壤重金属污染问题,根据大量空间距离数据和重金属元素含量数据,应用克里格插值法,绘制了重金属元素的空间分布图并建立了空间分布模型.同时,建立了评价城市表层重金属污染程度的数学模型,用内梅罗综合指数法和单项污染指数法评价了五类地区的污染程度,并找到重金属污染的主要原因是工业区的相关生产活动.最后,通过对重金属污染物在传播过程中主要特征的分析,建立了重金属污染物在土壤中的对流-弥散-吸附方程模型.

Optimization model for analysis of heavy metals pollution in urban topsoil

To analyze the problem of heavy metal pollution in urban topsoil, the spatial distribution map of the heavy metal is drawn and the spatial distribution model is established by using mass of data of spatial distance and heavy metal element content and Kriging interpolation method. Moreover, the evaluation model of the heavy metal pollution degree is established, and the pollution degrees of different regions of five categories are evaluated by using individual pollution index and Nemerow comprehensive index method. It is found that the crucial causes for the heavy metal pollution are industrial production activities. Lastly, the equation model of the convection-dispersion-adsorption is established based on analyzing the propagation characteristics of the heavy metal pollutants.