A catastrophic natural disaster chain of typhoon-rainstorm-landslide- barrier lake-flooding in Zhejiang Province, China
A catastrophic natural disaster chain of typhoon-rainstorm-landslide- barrier lake-flooding in Zhejiang Province, China
复制标题
中国浙江台风-暴雨-山体滑坡-堰塞湖-洪水的特大自然灾害链
DOI：
10.1007/s11629-020-6513-5
复制
发表时间：
2021
影响因子：
2.5
通讯作者：
Wei Jiangbo
中科院分区：
文献类型：
--
作者：
Cui Yulong;Hu Junhong;Xu Chong;Zheng Jun;Wei Jiangbo
2019年8月10日，受超级台风利奇马造成的暴雨影响，中国山灶村发生山体滑坡。阻塞了山灶溪，形成了堰塞湖，然后堰塞湖决口。这是一条罕见的台风-暴雨-滑坡-堰塞湖-洪水的自然灾害链。本研究以野外调查、卫星影像判读、数字高程模型（DEM）、工程地质分析及经验回归为基础。目的是揭示滑坡的特征和成因、堰塞湖的特征和形成过程以及溃坝泄洪量。结果表明，滑坡存款量约为2.4 × 10~5 m3。滑坡坝的溃决方式为漫顶，从滑坡坝形成到漫顶仅用了22分钟。溃坝洪峰流量1353 m3/s，平均流速2.8-3.0 m/s。研究表明，强风化岩土体边坡在强降雨条件下强度低、渗透性高，这提醒我们东南部人口密集地区重降雨条件下滑坡的高风险性和滑坡准确预警的重要性，以及台风-暴雨-滑坡-堰塞湖-洪水灾害链的严重性。
On August 10, 2019, due to the effect of a rainstorm caused by Super Typhoon Lekima, a landslide occurred in Shanzao Village, China. It blocked the Shanzao stream, forming a barrier lake, and then the barrier lake burst. This is a rare natural disaster chain of typhoon-rainstorm-landslide- barrier lake-flooding. This study was built on field surveys, satellite image interpretation, the digital elevation model (DEM), engineering geological analysis and empirical regression. The purpose was to reveal the characteristics and causes of the landslide, the features and formation process of the barrier lake and the dam break flooding discharge. The results show that the volume of the landslide deposit is approximately 2.4 × 10~5 m~3. The burst mode of the landslide dam is overtopping, which took only 22 minutes from the formation of the landslide dam to its overtopping. The dam-break peak flow was 1353 m3/s, and the average velocity was 2.8-3.0 m/s. This study shows that the strongly weathered rock and soil slope has low strength and high permeability under the condition of heavy rainfall, which reminds us the high risk of landslides and the importance of accurate early warning of landslides under heavy rainfalls in densely populated areas of Southeast China, as well as the severity of the disaster chain of typhoon- rainstorm-landslide-barrier lake-flooding.