罗兴云, 赵筱青, 张正欣, 罗桑扎西. 基于开放数据的城市内涝点空间分布特征及集群识别分析——以昆明市主城区为例[J]. 云南大学学报(自然科学版). doi: 10.7540/j.ynu.20230350
引用本文: 罗兴云, 赵筱青, 张正欣, 罗桑扎西. 基于开放数据的城市内涝点空间分布特征及集群识别分析——以昆明市主城区为例[J]. 云南大学学报(自然科学版). doi: 10.7540/j.ynu.20230350
LUO Xingyun, ZHAO Xiaoqing, ZHANG Zhengxin, Lobsangtashi. Spatial distribution characteristics and cluster identification analysis of urban waterlogging points based on open data: A case study of the main urban area of Kunming City[J]. Journal of Yunnan University: Natural Sciences Edition. DOI: 10.7540/j.ynu.20230350
Citation: LUO Xingyun, ZHAO Xiaoqing, ZHANG Zhengxin, Lobsangtashi. Spatial distribution characteristics and cluster identification analysis of urban waterlogging points based on open data: A case study of the main urban area of Kunming City[J]. Journal of Yunnan University: Natural Sciences Edition. DOI: 10.7540/j.ynu.20230350

基于开放数据的城市内涝点空间分布特征及集群识别分析——以昆明市主城区为例

Spatial distribution characteristics and cluster identification analysis of urban waterlogging points based on open data: A case study of the main urban area of Kunming City

  • 摘要: 以城市内涝点空间分布特征和同质性内涝点集群的识别及其孕灾环境分析为核心,选取昆明市主城区为案例地展开研究. 以2020年新闻媒体公布的内涝点信息作为数据源,首先使用核密度和K函数分析内涝点的整体分布和集聚程度;其次,采用HDBSCAN空间聚类算法识别昆明市主城区不同类型的内涝点集群,并分析其集群特征;最后,结合孕灾环境数据,以集群为最小研究单元,探讨其孕灾环境的差异性. 研究结果显示:①内涝点分布在空间上存在显著的尺度分异,呈现出大离散、小集聚的空间分布模式;②昆明市内涝点可划分为8种类型,每种类型至少有2个集群,最多有4个集群;③不同内涝点集群的孕灾环境存在一定差异,其中地形起伏对内涝点分布的影响最大,即集群范围内地形越崎岖不平,其发生内涝灾害的可能性越大. 在城市内涝防治工作中可依据集群空间范围及孕灾特征制定差异化的防治措施,从而科学合理的分配防治力度,提高城市内涝治理工作的科学性及精细度.

     

    Abstract: The main urban area of Kunming City is selected as the case study site, which focuses on the spatial distribution characteristics of urban waterlogging points and the identification of homogeneous waterlogging point clusters, along with an analysis of their disaster-prone environments. Leveraging waterlogging point information publicly disclosed by news media in 2020 as the data source, the research initially employs kernel density and K-function analyses to explore the overall distribution and clustering extent of waterlogging points. Subsequently, the study utilizes the HDBSCAN spatial clustering algorithm to identify different types of waterlogging point clusters in the main urban area of Kunming City, and analyzes the characteristics of these clusters. Lastly, combined with disaster-prone environmental data, the study takes the cluster as the smallest research unit to explore the diversity of its disaster-prone environment. The research findings reveal: ① a significant spatial scale differentiation in the distribution of waterlogging points is found out, showcasing a pattern characterized by extensive dispersion and minor aggregation; ② Kunming City's waterlogging points can be divided into eight distinct types, each with a minimum of two clusters and a maximum of four; ③ Different clusters of waterlogging points exhibit some distinct disaster-prone environments among which the topographical variations have the most significant influence on the distribution of waterlogging points. In other words, the rougher and more uneven is the terrain, the higher is the likelihood of experiencing waterlogging disasters within the cluster's scope. Therefore, in urban waterlogging prevention and control efforts, differentiated mitigation measures can be formulated based on the spatial scope of clusters and their disaster-prone characteristics. This approach enables a scientifically rational allocation of mitigation efforts, thereby enhancing the scientific rigor and precision of urban waterlogging management.

     

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