Abstract: On May 19, 2020, due to the impact of heavy rainfall, Edenville dam and Sanford dam in the United States broke one after another, leading to emergency evacuation of 11 000 residents nearby and causing an economic loss about 245 million dollars. The dam-break accident is described in detail from the aspects such as hydrometeorology, dam distribution in the basin, dam structure, accident process and et al., and the dam-break reasons are analyzed in depth from the technical level and management level respectively. The static liquefaction of non-plastic sand is the direct cause of the accident, and the successive dam failures in the basin has worsened the severity of the accident. Lessons are learnt that dam operation and management units should improve the joint regulation mechanism of cascade hydropower stations, strengthen the coordination with the dams upstream and downstream, and formulate corresponding emergency plans for various emergencies such as rainstorm and flood.

Key words: Edenville dam, Sanford dam, dam breach, basin, dam safety management

摘要： 2020年5月19日，受强降雨天气影响，美国密歇根州中部泰塔巴瓦希河上的伊登维尔坝和桑福德坝相继溃决，1.1万名居民紧急撤离，造成约2.45亿美元的经济损失。笔者从水文气象、流域大坝分布、大坝结构和失事过程等方面对溃坝事故进行描述，并从技术层面和管理层面对溃坝原因进行了深入分析，表明非塑性砂土静态液化是事故发生的直接原因。另外，流域大坝连续溃决加剧了事故的严重程度，警示各大坝运行管理单位要健全流域内梯级水电站的联合调度机制，加强与上下游大坝的协调联动，并为暴雨和洪水等突发事件制定相应的应急预案。

关键词: 伊登维尔坝, 桑福德坝, 溃坝, 流域, 大坝安全管理