How can they be surveyed efficiently?
At SEP Hydrographic, we typically acquire Multibeam Bathymetry of the riverbed and combine this with 3D Scanning Sonar data of the bridge abutments and other vertical structures. For debris surveys, a high-frequency side scan sonar may also be used. This is then combined with terrestrial survey sensors, including LiDAR and photogrammetry, to provide a complete picture of the asset.
For bridges crossing fast-flowing rivers, we would ideally aim to perform a survey when the water is moving at its slowest. Suppose the campaign seeks to identify or monitor potential flood damage. In that case, there are sensor deployment options available that are of lower safety impact, for example, crane deployment or Autonomous Surface Vessels (ASVs).
To present the resulting information in the best way, we've invested in an online data portal. Bringing together various datasets, the web-based system allows access to bridge survey data in a way that is simple to use and shared easily with relevant stakeholders.