Using a Multibeam Echo Sounder (MBES) the unknown about bridge footings can be revealed. Total Hydrographic’s MBES system has the capacity to acquire over 30,000 soundings per second enabling high detail point cloud data sets to be produced. Using this point cloud data a 3D model can be generated to identify any scouring around the footings that may be present or even deformation of the structure itself. Robust positioning is also maintained under bridges due to the integrated Inertial Navigation System (INS).
MBES point cloud data of scouring identified around bridge footing
MBES point cloud data of deep water bridge structure
Total Hydrographic were engaged by AJMJV on the Melbourne Metro Rail Project to capture the data using a dual head multibeam echo sounder with integrated Inertial Navigation System (INS). The images above and to the right show what was revealed as a result of the survey. Major scourings of the bridge footings were revealed with up to 1m of scouring around one of the footings. The results were delivered to the client as an XYZ output for their internal modelling.
2D contoured survey results with aerial imagery