云南山火与滑坡灾害的时空格局及其相关性研究

Investigating the Spatial Temporal Distribution and Correlation of Wildfires and Landslides in Yunnan Provincee

  • 摘要: 以云南省2006—2016年的山火及滑坡点为对象,运用GIS热点及核密度方法,分析了灾害的时空特征,并以相关矩阵法,阐释了山火与滑坡的时空关系。结果表明:2006—2016年山火与滑坡分布具有时空异质性,从大面积离散分布逐步演变为小面积聚集分布,各州市山火和滑坡总体核密度分别为1.01 × 10−2个/km2和3.09 × 10−2个/km2,其中昭通和保山等地的滑坡密度较大。山火发生主要聚集在滇南的西双版纳和普洱、滇东的曲靖、滇西北等地。云南山火的发生与滑坡灾害呈现正相关关系,相关系数达0.46。因此,山火与滑坡点存在一定的空间链发关系,发生山火后,应及时进行生态修复以避免次生灾害发生。研究揭示了云南山火与滑坡的关系,可为云南山地火后生态修复及滑坡灾害的防控等提供参考。

     

    Abstract: The study aims to explore the spatial and temporal dynamics of wildfires and landslides and their relationship in Yunnan Province, providing a scientific basis for disaster prevention and control. Using wildfire and landslide occurrence data from 2006 to 2016 in Yunnan Province as the study area, GIS hotspot and kernel density methods were used to analyze the spatiotemporal characteristics of disasters, and the correlation matrix method was used to examine the spatiotemporal relationship between wildfires and landslides. The results show that both wildfires and landslides in mountainous areas gradually evolved from a large-scale discrete distribution to small-scale clustered patterns over the study period. The overall kernel densities of wildfires and landslides across all prefectures and cities were 1.01×10−2 and 3.09×10−2 points per square kilometer, respectively, with higher landslide densities in Zhaotong and Baoshan. Wildfires mainly occur in Xishuangbanna and Pu'er in southern Yunnan, Qujing in eastern Yunnan, and northwest Yunnan. A positive correlation was found between ildfire and landslide occurrences, with a correlation coefficient of about 0.46. It can be concluded that there is a specific spatial coupling relationship between wildfires and landslide sites. Ecological restoration should be carried out promptly to prevent secondary landslides during wildfires. The study reveals the relationship between wildfires and landslides in Yunnan, providing a theoretical basis for post-fire ecological restoration, landslide disaster prevention and control, and the prevention of other secondary disasters in Yunnan's mountainous areas.

     

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