正在施工的龙羊峡水电站，1981年9月发生了有实测记录以来最大的一次洪水。
The Longyangxia hydropower project which in under construction encountered the heaviest flood on record in September, 1981.
本文首先结合既有的风险分析理论和方法，建立了大跨连续刚构桥施工期间地震及洪水风险分析的基本流程。
Combined with the exiting risk theory, the basic processes of risk analysis concerning earthquake and flood for long-span continuous rigid-frame Bridges during construction are established.
针对施工期地震或洪水发生时可能造成的损失，本文从经济损失、人员伤亡、工期延误、环境影响四个方面进行了考虑。
As of the costs caused by earthquake or flood during construction, four kinds of losses are considered, they are: economic losses, casualties, construction delay and environmental impact.
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