关键词: 奥洛维尔大坝, 溢洪道, 泄槽破坏, 应急调度, 强制撤离

Abstract: The main spillway of lake Oroville was found damaged on February 7, 2017. In the subsequent days, the incident was exacerbated and eventually caused a massive evacuation of local residents. The damage of the main spillway was caused and aggravated by relatively poor geology condition, thin chute, inadequate concrete strength and inattentive inspections. A series of inappropriate emergency operations forced the emergency spillway being used, causing excessive erosion at the base of the weir of emergency spillway, which threatened to undermine and collapse the concrete weir. Fearing the collapse, an evacuation order was issued by the local government and 188 000 people in the vicinity were evacuated.

Key words: Oroville dam, spillway, damage of chute, emergency operations, massive evacuation