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Geological and Geophysical (G&G) and
High-Resolution Geophysical (HRG) Surveys
G&G HRG surveys efficiently map seabed morphology and subbottom stratigraphy using a suite of geophysical tools and are often performed to aid in siting offshore (i.e. O&G, renewable energy) structures and locating marine mineral resources. HRG surveys are also used to support offshore archaeological, geohazard, benthic habitat, unexploded ordinance (UXO) mappings and evaluations. HRG surveys may include:
- Multibeam echosounder
- Side Scan Sonar
- Subbottom Seismic Reflection Profiler
- Subbottom Seismic Refraction
- Marine Magnetometer and/or Gradiometer
G&G and HRG Fig. 1
Side scan sonar mosaic.
G&G and HRG Fig. 2
Survey vessel.
G&G and HRG Fig. 3
Survey vessel diagram
G&G and HRG Fig. 4
Shaded relief mutibeam imagery.
Representative Projects
Archaeological Investigation: Searsport, Maine
Using marine geophysical techniques, Ocean Surveys conducted an archaeological investigation in Searsport Harbor, Maine. It was completed in support of a channel deepening project performed by the U.S. Army Corps of Engineers (New England District). The investigation was designed to ...
Charting Navigable Waters
Ocean Surveys was a subcontractor to the prime on NOAA’s very first contracted hydrographic survey. Since 1999, OSI has acted as a prime contractor and surveyed thousands of square nautical miles of navigable waters on behalf of NOAA (see table ...
Coastal Monitoring: Offshore Bethany Beach, Delaware
In 1988 several pieces of artillery shells were discovered on Bethany Beach and Sea Colony Beach in Delaware. A recent beach replenishment project used sand recovered from a borrow area within the bounds of a historic anti-aircraft target range operated ...
Expanding Navigable Waterways: Savannah, Georgia
A geophysical survey investigation in the Savannah River Entrance Channel was conducted by Ocean Surveys for the U.S. Army Corps of Engineers. The investigation was specifically designed to complement and expand upon subbottom data that was previously acquired by OSI ...
Marsh Restoration: Whiskey Island, Louisiana
Integrated hydrographic/geophysical surveys and a vibratory coring program were completed in the Gulf of Mexico in the waters offshore of Whiskey Island, Louisiana for the LDNR and The United States Environmental Protection Agency. OSI completed these investigations under subcontract to ...
Submarine Cable and Pipeline Routing: Massachusetts Bay
Ocean Surveys, Inc. initially performed a desktop study to compile geologic, oceanographic, sediment chemistry, and marine activity background information supporting the feasibility assessment of the project. This research was followed by a reconnaissance level marine geophysical survey along an alignment ...
Submarine Outfall Placement: Offshore of Sosua, Dominican Republic
Ocean Surveys conducted an oceanographic and geophysical data collection program in near shore waters off of Sosua, Dominican Republic, to support a joint project between the Dominican government and the World Bank. The project required a detailed investigation of the ...
Wastewater Treatment and Disposal: Alexandria, Egypt
The wastewater treatment and disposal facilities serving the City of Alexandria, Egypt were being modernized and upgraded. Feasibility studies required thorough evaluation of wastewater disposal alternatives, including an ocean outfall. To support that evaluation, OSI conducted a multi-disciplinary survey program ...
Wind Farm Development: Atlantic Ocean, Offshore Rhode Island
From 2009 to 2017, OSI provided extensive survey and data analysis for the wind farm development offshore Rhode Island. These services were performed in support of all phases of the design, permitting, and construction of five wind turbines, inter-array, and ...