关键词: 多波束测深, 数字高程模型, 监测研究, 大型桥梁, 感潮河段

Abstract:

It is necessary to monitor underwater topography of large bridges during operation because the bridge girder scouring is the primary cause of the damage. And we should take effective measures to ensure the safety of the bridge girder. So, for Sutong Bridge, we introduced the underwater topography monitoring purposes, scope and scheme of large bridges during operation of tidal reach in detail. The varying pattern of erosion and deposition in riverbed of main girder surrounding and the bridge site area and scour depth could be directly reflected by analyzing data from multi-beam monitoring of riverbed topography and establishing digital elevation model in bridge area. We can make some scientific predictions for the safety of bridge girder and the variation trend of river regime in bridge area according to the research results, which could provide decision-making basis for safe operation and maintenance of large bridges and provide important basic information for relevant research work.

Key words: multibeam sounding system, digital elevation model, research of monitoring, large bridge girder, tidal reach