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一、历史概况关于桥梁壅水问题,美国于本世纪五十年代已将它作为一个综合性的研究课题展开了全面研究。六十年代初提出了三种办法: 1.USGS法——内政部地质勘探局法建立在模型试验和野外资料验证的基础上。 2.FHWA法——运输部联邦公路局法它是根据模型研究与USGS的野外资料建立的。
I. Historical Overview With regard to the bridge water problem, the United States conducted a comprehensive study of it as a comprehensive research topic in the 1950s. Three methods were proposed in the early 1960s: 1. USGS method - The Geological Prospecting Bureau of the Ministry of the Interior is based on model tests and field data validation. 2.FHWA Law - Department of Transportation Federal Highway Bureau Act It is based on modeling studies and USGS field data to establish.