横断山区泥石流空间格局和激发雨量分异性研究

doi:10.11821/dlxb201911008

Abstract

Abstract:

Environmental factors determine the spatial and temporal distribution of debris flows. Understanding the relationship between debris flows and their effective factors is important for debris flows risk assessment at regional scale. In this paper, geographic detectors and gray correlation analysis are used to explore the relationship between 11 influencing factors, including precipitation, climate, landforms, geology, land cover type, soil thickness and topographic wetness, and the spatial distribution of debris flows-prone catchments, as well as the spatial and temporal correlation between precipitation and debris flows disasters in the Hengduan Mountains region. The results show that the topographic wetness index is the most dominant factor controlling the spatial distribution of the catchments, followed by topographic relief and soil thickness. Temporal correlation between debris flows disasters and precipitation characteristics has large regional heterogeneity. The rainfall characteristics of debris flows disaster events in different regions exhibit significant difference. The frequency of debris flows with rainfall, topographic wetness, topographic relief and soil thickness in the Hengduan Mountains region varies significantly in different zones, which indicates that not only the rainfall but also the other factors controlling the spatial pattern of debris flows should be reflected in debris flows early warning model in the region.

Key words: debris flows disaster, environmental factors, rainfall characteristics, geographical detectors, grey relational analysis

HU Kaiheng, WEI Li, LIU Shuang, LI Xiuzhen. Spatial pattern of debris-flow catchments and the rainfall amount of triggering debris flows in the Hengduan Mountains region[J].Acta Geographica Sinica, 2019, 74(11): 2303-2313.

Figures/Tables 11

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区编号	最低海拔(m)	最高海拔(m)	海拔标准差(m)	气候类型	地貌类型	地质类型
子区1	322	6998	654	东部季风	云贵川高中山山原	华南和亲华南陆块群
子区2	669	4362	502	东部季风	云贵川高中山山原	冈瓦纳和亲冈瓦纳大陆陆块群
子区3	773	7447	767	东部季风	横断高山山原	华南和亲华南陆块群
子区4	290	5846	725	东部季风	横断高山山原	冈瓦纳和亲冈瓦纳大陆陆块群
子区5	1479	6144	491	青藏高寒	横断高山山原	华南和亲华南陆块群
子区6	1954	6629	471	青藏高寒	横断高山山原	冈瓦纳和亲冈瓦纳大陆陆块群

数据名称	时间	数据来源	数据格式
泥石流灾害事件	1998-2017	文献、新闻搜集	点状图层
泥石流沟		水工环地质信息服务平台	点状图层
年平均降雨量	1998-2017	TRMM 3B42v7	25 km×25 km格网
日降水量分别大于10 mm、25 mm及50 mm的20年平均总天数	1998-2017	TRMM 3B42v7	25 km×25 km格网
地貌分区	1989	文献[2]	面图层
地质分区	1989	文献[23]	面图层
气候分区	1989	文献[24]	面图层
土地覆盖	2000	寒区旱区科学数据中心	1 km×1 km格网
土壤厚度	2000	中山大学陆气相互作用研究工作组	10 km×10 km格网
高程	2000	STRM	90 m×90 m格网

Spatial pattern of debris-flow catchments and the rainfall amount of triggering debris flows in the Hengduan Mountains region

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Figures/Tables 11

References 30

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