摘要
为研究易贡滑坡-堰塞坝溃坝链生灾害的动力学特征,基于遥感影像数据建立三维数值模型,运用DAN^3D和FLOW^3D对易贡滑坡-碎屑流-堰塞坝溃坝全过程进行模拟研究。运用DAN^3D模拟滑坡-碎屑流过程,得到滑坡碎屑堆积分布特征及速度变化规律,滑坡持续时间300 s,平均速度35 m/s。基于DAN^3D获得的滑坡碎屑堆积分布建立等比例堰塞坝模型,运用FLOW^3D模拟溃坝后洪水演进过程,得到洪水演进过程水流特征变化规律,通麦大桥处洪峰流量130000 m^3/s与实测值接近。对易贡滑坡灾害链全过程的模拟和动态特征分析可为高山峡谷区类似的滑坡-堰塞坝溃坝链生灾害风险评价提供参考。
In order to study the dynamic characteristics of Yigong rockslide-debris avalanche-dam breaking disaster chain,we used DAN^3Dand FLOW3 Dwith a three dimensional numerical model built by the satellite imagery to simulate this event.A dynamic landslide analysis(DAN^3D)model was used to simulate the runout behavior of rockslide-debris avalanche.The simulation results indicated that the duration of the movement is estimated at about300 s for a mean velocity 35 m/s.Based on the final deposit distribution obtained from DAN^3D,a landslide dam model was built in FLOW^3Dto simulate dynamic characteristics of outburst flood.The maximum discharge of 130000 m^3/s at Tongmai bridge simulated in FLOW^3Dis similar to the monitored discharge.This study provide a basis for risk assessment and prevention of landslide induced disaster chain in canyon area.
作者
戴兴建
殷跃平
邢爱国
DAI Xingjian;YIN Yueping;XING Aiguo(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China;China Institute of Geo-Environment Monitoring,Beijing 100081,China)
出处
《中国地质灾害与防治学报》
CSCD
2019年第5期1-8,共8页
The Chinese Journal of Geological Hazard and Control
