Multibeam Hydrographic Survey – Sabine Channel, Port Arthur, Texas

Multibeam hydrographic survey of the Port Arthur, Texas turning basin for an incident involving the grounding of a vessel in February 2006. The object was to determine the shape and depth of the actual area of the turning basin as compared to the U.S. Corps of Engineers’ design. CRA used a Reson Seat Bat model 8124 multibeam depth sounder system, which included a Meridian Gyrocompass, T.S.S. DMS05 motion sensor, and an Odom Digibar velocimeter together with real time differential GPS positioning, using a Trimble model AG132 receiver and Navbeacon signals.

Data was recorded and processed using Hypack and Hysweep software and then imported to Bentley Microstation for production of the final drawings. The vessel for this work was CRA’s 24 foot cabin boat, the M/V Seahawk II. A few lines were also run with a traditional single-beam depth sounder (Odom Hydrotrac) as cross-sections over the area to compare with those generated from the multi-beam terrain model.

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