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1.重庆交通大学河海学院,重庆 400000
2.重庆交通大学山区公路水运交通地质减灾重庆市高校重点实验室, 重庆 400000
Received:07 March 2023,
Revised:2023-04-24,
Published:30 August 2024
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雷青青,向灵芝,罗亮等.基于信息量与灾害熵的泥石流危险性评价对比研究——以成兰铁路松潘段为例[J].防灾减灾工程学报,2024,44(04):921-932.
LEI Qingqing,XIANG Lingzhi,LUO Liang,et al.A Comparative Study on Debris Flow Hazard Assessment Based on Information Volume and Disaster Entropy: a Case Study of Songpan Section of Chengdu‑Lanzhou Railway[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(04):921-932.
雷青青,向灵芝,罗亮等.基于信息量与灾害熵的泥石流危险性评价对比研究——以成兰铁路松潘段为例[J].防灾减灾工程学报,2024,44(04):921-932. DOI: 10.13409/j.cnki.jdpme.20230307001.
LEI Qingqing,XIANG Lingzhi,LUO Liang,et al.A Comparative Study on Debris Flow Hazard Assessment Based on Information Volume and Disaster Entropy: a Case Study of Songpan Section of Chengdu‑Lanzhou Railway[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(04):921-932. DOI: 10.13409/j.cnki.jdpme.20230307001.
以成兰铁路松潘段为研究区域,根据野外调查分析、研究区基本环境地质条件,选取9项影响因子:高程、坡度、降雨量、岩性、地震烈度、NDVI(归一化植被指数)、距离断裂距离、HI(物源参照值)以及流域形状系数,分析泥石流的分布特征。基于GIS技术,通过信息量和灾害熵两种不同的模型,对各评价指标图层进行分类计算,并进行泥石流危险性评价。
结果
2
在信息量模型中,研究区内危险中度及以上占总面积的87%;泥石流沟内危险中度及以上占沟总面积的65%,共31条。灾害熵模型中,研究区内中危及以上危险区占总面积的81%;泥石流沟内中危区及以上危险区占沟总面积的80%,共38条。与灾害的实际分布相比,灾害熵模型给出了更接近实际的结果。
Focusing on the Songpan section of the Chengdu-Lanzhou Railway as the study area
the study analyzed the distribution characteristics of debris flow based on field investigation and the region's basic environmental geological conditions. Nine influencing factors were considered
including elevation
slope
rainfall
lithology
seismic intensity
normalized difference vegetation index (NDVI)
distance from faults
source material reference value (HI)
and watershed shape coefficient. Using GIS technology
two different models - information volume and disaster entropy - were applied to classify and calculate each assessment index layer
and the debris flow hazards were assessed. Results showed that
according to the information volume model
87% of the total area in the study area was classified as moderate hazard or above
with 65% of the total area within the debris flow ditches classified as moderate or higher hazard
covering 31 ditches. In the disaster entropy model
areas with moderate or higher hazard levels accounted for 81% of the total study area
and 80% of the total area within the debris flow ditches were classified as moderate or higher hazard
covering a total of 38 ditches. Compared to the actual distribution of hazards
the disaster entropy model provided results that were closer to reality.
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