基于ArcGIS和EVS的堆放废物危险特性鉴别应用与研究

Application and Study of Hazardous Characteristics Identification of Stacked Waste Based on ArcGIS and EVS

为科学合理制订露天堆放废物危险特性鉴别采样方案,直观展示超鉴别标准限值废物空间分布范围,针对某大型废物堆放场地展开研究。首先,应用ArcGIS进行绘制堆放边界、创建网格、计算中心坐标、顺序编号等操作,制订废物采样方案;然后,应用EVS创建堆场地形和浸出毒性无机氟化物三维可视化模型,对比Kriging、IDW、NN和RBF 4种插值方法中无机氟化物超标空间范围和方量差异;最后,采用K折交叉验证评估插值精度。研究表明:应用ArcGIS制订采样方案可大幅简化现场工作量;应用EVS 4种插值方法构建的三维可视化模型存在差异,进一步证实了Kriging插值精度最高,较切实地反映出超标空间范围,并可据此估算超标方量。

In order to develop a scientifically robust sampling scheme for identifying the hazardous characteristics of solid waste in the open air and visually represent the spatial distribution range of waste exceeding the super identification limit,a study was conducted at a large solid waste site.First,a waste sampling scheme was developed using ArcGIS to delineate the site boundaries,create grids,calculate central coordinates,and number the sequence.Then,the Environmental Visualization System(EVS)was utilized to generate 3D visual models of the terrain and the inorganic fluorides extraction toxicity respectively.The spatial ranges and quantities of inorganic fluorides exceeding the threshold were compared using four interpolation methods,including Kriging,Inverse Distance Weighting(IDW),Nearest Neighbor(NN),and Radial Basis Function(RBF).Finally,the accuracy of these methods was evaluated using the K-fold cross-validation technique.The findings indicated that the application of ArcGIS to develop the sampling scheme could considerably simplify the on-site workload.And there were differences in 3D visualization models constructed by the four EVS interpolation methods.Moreover,the Kriging method demonstrated the highest accuracy and offered a more realistic depiction of the space range exceeding the standard limits.And based on this,the amount of excess square was estimated.