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四川省甘洛县2019年群发性山洪泥石流灾害的形成机理
李钰1, 甘滨蕊2, 王协康2, 陈明亮1, 周家文1
1.四川大学 水力学与山区河流开发保护国家重点实验室, 四川 成都 610065;2.四川大学 水利水电学院, 四川 成都 610065
摘要:
[目的] 对四川省甘洛县2019年群发性山洪泥石流灾害成因机理进行分析,为山区山洪泥石流灾害防控减灾提供参考。[方法] 对2019年甘洛县山洪泥石流灾害开展现场调查,并结合相关影像和雨情数据等资料,对山洪泥石流灾害的影响因素以及形成机理进行分析。[结果] 2019年甘洛县山洪泥石流主要是由于短期强降雨所诱发的,加之区内有丰富的固体物源以及有利的地形地貌条件;山洪泥石流灾害是洪水与固体物质相互作用共同致灾的产物;山洪泥石流运动过程中受到地形以及一些工程设施的影响比较明显;同时山洪泥石流会挤压主河道甚至阻断河道,从而导致更大灾害。[结论] 基于甘洛县山洪泥石流灾害的形成机理与致灾特征,应该以加强灾区生态修复与水土保持为本,采取工程防治与生态防治相结合的治灾措施。
关键词:  山洪泥石流  影响因素  形成机理  致灾模式  防控措施  甘洛县
DOI:10.13961/j.cnki.stbctb.2020.06.040
分类号:P642.23
基金项目:国家重点研发计划项目“山区暴雨山洪水沙灾害预报预警防控平台构建与示范”(2019YFC1510705);国家自然科学基金重点项目“西南山区暴雨诱发泥沙补给突变下的山洪灾害研究”(51639007)
Formation Mechanism of Group Flash Flood/Debris Flow Disasters in Ganluo County, Sichuan Province in 2019
Li Yu1, Gan Binrui2, Wang Xiekang2, Chen Mingliang1, Zhou Jiawen1
1.State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China;2.College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China
Abstract:
[Objective] The formation mechanism of the group flash flood/debris flow disasters in Ganluo County of Sichuan Province in 2019 was analyzed in order to provide a reference for the prevention and mitigation of flash flood/debris flow disasters in mountainous areas.[Methods] Based on the field investigation of the group flash flood/debris flow disasters in Ganluo County in 2019, combined with relevant images and rainfall data, the influencing factors and formation mechanism of flash flood/debris flow disasters were analyzed.[Results] The flash flood/debris flow disasters in Ganluo County were mainly caused by short-term heavy rainfall, in addition, there were abundant solid resources and favorable landform conditions in the area. The flash flood/debris flow disasters were the production of the interaction between flood and solid materials. The flash flood/debris flow movement was affected by terrain and some engineering facilities. Meanwhile, the flash flood/debris flow squeezed the main channel or even blocked the channel, thus leading to more disasters.[Conclusion] Based on the formation mechanism and disaster-causing characteristics of flash flood/debris flow disasters in Ganluo County, the disaster control measures shuld be based on strengthening ecological restoration and soil and water conservation in disaster-stricken areas, and combining engineering prevention and ecological control.
Key words:  flash flood/debris flow  formation mechanism  disaster mode  prevention and control measures  Ganluo County