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Application of k-means clustering to environmental risk zoning of the chemical industrial area

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Abstract

The homogeneous risk characteristics within a sub-area and the heterogeneous from one sub-area to another are unclear using existing environmental risk zoning methods. This study presents a new zoning method by determining and categorizing the risk characteristics using the k-means clustering data mining technology. The study constructs indices and develops index quantification models for environmental risk zoning by analyzing the mechanism of environmental risk occurrence. We calculate the source risk index, air risk field index, water risk field index, and target vulnerability of the study area with Nanjing Chemical Industrial Park using a 100 m × 100 m mesh grid as the basic zoning unit, and then use k-means clustering to analyze the environmental risk in the area. We obtain the optimal clustering number with the largest average silhouette coefficient by calculating the average silhouette coefficients of clustering at different k-values. The clustering result with the optimal clustering number is then used for the environmental risk zoning, and the zoning result is mapped using the geographic information system. The study area is divided into five sub-areas. The common environmental risk characteristics within the same sub-area, as well as the differences between subareas, are presented. The zoning is helpful in risk management and is convenient for decision makers to distribute limited resources to different sub-areas in the design of risk reducing intervention.

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Authors and Affiliations

  1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing, 100875, China

    Weifang Shi & Weihua Zeng

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  1. Weifang Shi
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  2. Weihua Zeng
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Correspondence to Weihua Zeng.

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Shi, W., Zeng, W. Application of k-means clustering to environmental risk zoning of the chemical industrial area. Front. Environ. Sci. Eng. 8, 117–127 (2014). https://doi.org/10.1007/s11783-013-0581-5

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  • DOI: https://doi.org/10.1007/s11783-013-0581-5

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