摘要
2015年“4·25”尼泊尔地震后,调查发现吉隆县境内有183处地质灾害,主要为崩塌、滑坡和泥石流。调查发现地质灾害主要是中、小型地质灾害,其中小型占65.55%,中型占29.5%。吉隆县震后地质灾害分布极不均匀,地质灾害主要集中在吉隆镇、贡嘎镇和贡当乡,这三个乡(镇)占81.41%。调查发现高程、坡度、坡向、地层岩性及地震烈度影响灾害空间分布,并且每一种影响因子对灾害形成的作用差异较大。其中高程1000~2000 m敏感性最高,随着高度的增加,敏感性逐渐降低;坡度对灾害的敏感性系数整体较低,其中在0°~15°及45°以上范围内,坡度对灾害敏感性较强;地质灾害在西坡向上分布数量及敏感性最大,而在北坡向上分布数量及敏感性最低;地质灾害主要发生在第四系,而上第三系、奥陶系、石炭系则灾害数量极少。可见不同影响因子对地质灾害的影响差异较大,震后需要根据具体情况分类分析,研究结果将为震后灾害预测及灾后重建提供参考。
After the 4·25 earthquake in Nepal in 2015,183 geological disasters were found in Jilong County,mainly collapses,landslides and debris flows.The survey found that the main geological disasters were small and medium-sized,of which 65.55%were small and 29.5%were medium-sized.It was found that the distribution of geological disasters were extremely uneven in Jilong County.Geological disasters were mainly concentrated in Jilong County,Gongga Town and Gongdang Township,with the proportion of these three townships(towns)reaching 81.41%.It was found that elevation,slope gradient,slope direction,stratigraphic lithology and seismic intensity affect the spatial distribution of disasters,and the effect of each influence shadow on the formation of disasters were quite different.The sensitivity was the highest in the range of 1000~2000 m,with the increase of height,the sensitivity decreases gradually.The sensitivity coefficient of slope to disasters were relatively low,and the sensitivity of slope to disasters were relatively strong in the range of 0°~15°and above 45°.The number and sensitivity of geological disasters were the greatest in the west slope,and the lowest in the north slope.Geological disasters mainly occurred in the Quaternary,while the upper Tertiary,Ordovician and Carboniferous had a very small number of hazards.It can be seen that the impact of different factors on geological disasters is quite different.After the earthquake,it needs to be classified and analyzed according to the specific situation.The research results will provide a reference for disaster prediction and reconstruction after the earthquake.
作者
韩培锋
王镁河
姜兆华
樊晓一
田述军
HAN Peifeng;WANG Meihe;JIANG Zhaohua;FAN Xiaoyi;TIAN Shujun(School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang,Sichuan 621010, China;Research Center on Mountain Torrent and Geological Disaster Prevention of Ministry of Water Resources, Wuhan, Hubei 430010, China)
出处
《中国地质灾害与防治学报》
CSCD
2020年第2期111-118,共8页
The Chinese Journal of Geological Hazard and Control
基金
水利部山洪地质灾害防治工程技术研究中心开放基金(CKWV2019759/KY)
国家重点研发计划项目(2018YFC1505401)
国家自然科学基金项目(41877524)
四川省科技厅重点研发项目(18SZ0345)
西南科技大学龙山人才计划(18lzx685)。
关键词
尼泊尔地震
吉隆县
地质灾害
空间分布
敏感性
Nepal earthquake
Jilong County
geological disasters
space distribution
susceptibility
