苏洼龙水电站遭遇白格堰塞湖灾害应对措施

Emergency Measures in Suwalong Hydropower Station for Dealing with the Barrier Lakes Formed in Baige

“10·11”和“11·03”白格堰塞湖灾害发生时,位于下游的苏洼龙水电站正进行主体工程施工。综合分析两次白格堰塞湖的规模、苏洼龙水电站上游围堰的防洪能力、围堰溃决造成的洪水叠加效应及工程应对措施实施的可行性,分别提出了利用上游围堰挡水和围堰主动坡口两种不同的应对措施。两种应对措施最大限度地降低了堰塞湖灾害影响范围,有效减轻了下游河段的防洪压力,并确保了苏洼龙水电站工程人员及设备安全,可为研究与评价水电工程的防灾减灾效益,以及工程遭遇堰塞湖灾害时应对措施的制定提供借鉴和参考。

During the construction of the Suwalong hydropower station,the barrier lake caused by landslide in Baige upstream the project formed twice,namely on 11th October and 3th December,2018.To ensure the safety of the workers and reduce the economic loss,the emergency measures play an important role on dealing with the natural disaster.In response to the disaster,two approaches have been adopted,i.e.the scheme of retaining the coming flow by the upstream cofferdam constructed on site of Suwalong project while releasing the water by the diversion tunnel and the scheme of breaching the upstream cofferdam,which have been proposed in order immediately after the occurring of the two landsilde.The approaches have been proposed by analyzing the flood superposition effect caused by the cofferdam break of the Suwalong hydropower station,and important factors including the capacities of the two barrier lakes,the feasibility of the approaches and the regulation function of the upstream cofferdam have been considered.The result shows that the emergency measures have minimized the scope of the impaction,ensured the safety of the workers and equipment,reduced the pressure of flood control downstream the project.Futhermore,the emergency measures implemented in this disaster can provide guidance for dealing with similar accidents during the construction of other projects and appraising the benefits of disaster prevention and reduction.