甘肃省康县周家坝镇“8·18”堰塞湖处置研究

Research on disposal of“8·18”barrier lake in Zhoujiaba Town,Kang County,Gansu Province

甘肃省康县周家坝镇“8·18”堰塞湖是由持续强降雨突发滑坡滑动堵塞河谷而形成的,研究堰塞湖的形成原因对指导应急排险救灾和后续治理处置具有重要意义。通过无人机航拍影像及后期实测地形图、剖面图、水位、流量监测资料,基于灾害损失影响调查评估,将定性经验判别和定量计算方法相结合,深入研究了堰塞湖的形成原因、过程和特征;同时,还开展了风险评估,以及渗透稳定性、抗滑稳定性、应急处置预警水位及流量方面的分析。结果表明:对于突发性滑坡形成的堰塞湖灾害,应深入分析其产生的原因和形成的条件,有针对性地制定出紧急应急排险救灾及其后续治理措施。研究成果可为突发滑坡导致的堰塞湖处置提供经验和借鉴,并可为应急排险救灾和后续治理决策提供科学依据。

The“8·18”barrier lake in Zhoujiaba Town,Kang County of Gansu Province was formed by a landslide caused by continuous heavy rainfall blocking a river valley.It is important to study the barrier lake for guiding emergency disaster relief and subsequent treatment.In this paper,based on the data of UAV aerial images and later measured topographic map,profile map,water level,flow monitoring,we investigated and evaluated the disaster loss impact,and combining the qualitative experience discrimination with quantitative calculation method,deeply studied the formation cause,process and characteristics of barrier lake.At the same time,we carried out risk assessment as well as analysis of seepage stability,anti-slid stability,emergency response and early warning of water level and flow.The results show that for the barrier lake disasters caused by sudden landslides,we should deeply analyze the causes and formation conditions,and formulate emergency disaster relief and subsequent treatment measures in a targeted manner.The research results can provide experience and reference for the treatment of barrier lakes caused by sudden landslides,and provide a scientific basis for emergency disaster relief and subsequent governance decisions.