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Marine Services :: Infrastructure Inspection

DEA Marine Services has been on the forefront of high-resolution multibeam bathymetric survey technology for monitoring underwater structures since the early 1990s. We evolved this service to monitor both the underwater and above-water portions of stilling basins, dams, bridges, marine pipelines and cables, outfalls, and coastal navigation structures using a variety of methods, including:

  • Surface-based, high-resolution multibeam sonar
  • Underwater scanning bathymetric sonar
  • Remotely Operated Vehicle (ROV) video inspections
  • Above-water, high-definition laser scanning
  • Sub-bottom profiling
  • 3D modeling
  • Acoustic Doppler current profiling

These types of surveys have been performed for the USACE, the Waterways Experiment Station (now the ERDC Coastal and Hydraulics Laboratory), hydropower companies, municipalities, pipeline and cable owners/operators, port authorities, and state Departments of Transportation.

The USACE mission of monitoring underwater structures and evaluating erosion areas before they become a problem requires quality data with highly accurate and precise horizontal and vertical positioning.

DEA has been chosen to perform this work based on our demonstrated ability to fulfill USACE’s objective of precision monitoring. As a recognized expert, DEA’s project report for Howard Hanson Dam Monitoring Surveys was included in Appendix O of the USACE Hydrographic Survey Manual, EM 1110-2-1003, 2013, as an example of how to monitor earthen dams.


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