Discover how LVR Flote tackled the challenges of hydrographic surveying during the Salaca River Bridge reconstruction using Teledyne Marine’s SeaBat T20-ASV. Find out how this advanced USV-mounted multibeam sonar delivered high-precision data in inaccessible areas, enhancing safety and efficiency.
When reconstruction efforts began on the Salaca River Bridge in Salacgrīva, Latvia—an essential infrastructure project under the EU Military Mobility initiative—precise underwater mapping was critical. However, traditional hydrographic survey methods faced significant challenges due to the complexity of the riverbed and restricted access near the bridge.
To overcome these obstacles, hydrographic survey specialists LVR Flote deployed an Uncrewed Surface Vessel (USV) outfitted with Teledyne Marine’s SeaBat T20-ASV multibeam sonar. This advanced technology provided the accuracy and efficiency necessary to ensure safe and effective construction.
Challenges of Hydrography Near Infrastructure
The reconstruction of the Salaca River Bridge presented several difficulties for hydrographic data collection. Traditional vessels struggled to reach certain areas, and environmental factors such as turbidity, sediment buildup, and conductivity variations added complexity to sonar readings.
Additionally, divers were present in key work zones, requiring real-time data to prevent hazards. Without high-resolution bathymetric imaging, survey teams risked incomplete measurements, potential construction delays, and safety concerns.
USV + SeaBat T20-ASV: The Perfect Solution
To navigate these challenges, LVR Flote turned to a remote surveying approach, using a USV paired with the SeaBat T20-ASV multibeam sonar. Designed for uncrewed and autonomous operations, this compact and high-resolution sonar system excels in confined and difficult environments, making it an ideal fit for bridge inspections and infrastructure projects.
Key Features That Made the Difference:
- Tracker Mode (Automated Sonar Controls): Acts as an autopilot for sonar settings, optimizing performance without constant manual adjustments—essential for remote operations.
- Vertical Detection Mode: Allows precise scanning of bridge foundations, seawalls, and other vertical structures, which are typically difficult to measure with conventional sonar systems.
- High-Resolution Data Capture: The system produces detailed bathymetric images, reducing the need for divers and improving safety.
The Results
By utilizing USV technology with the SeaBat T20-ASV, LVR Flote successfully collected high-accuracy underwater measurements in restricted areas, helping ensure the safe and precise reconstruction of the Salaca River Bridge.
The project’s success has also expanded LVR Flote’s capabilities, enabling them to offer advanced hydrographic services to Latvian ports, municipalities, and construction firms working on water infrastructure projects.
With uncrewed systems reducing risk, improving efficiency, and providing unmatched data accuracy, this case highlights how next-generation sonar technology is transforming hydrographic surveying.
