Location: Natural Resources > Marine Sciences

Hydrographic Survey and Oceanographic Measurements

EA is an industry leader in conducting marine environmental sampling, as well as oceanographic measurement and monitoring services to federal and state agencies, port authorities, and commercial clients throughout the United States. EAs capabilities include sample collection and analysis, and environmental characterization at sites located within inland, coastal, and offshore waters out to the edge of the continental shelf. We offer a vast array of marine and aquatic survey capabilities to support our large-scale environmental programs, as well as standalone oceanographic services to our clients.

Seafloor and Seabed Characterization

EA employs optical, acoustic, and electromagnetic survey tools to conduct seafloor and seabed characterization projects, ranging from broad scale mapping of the continental shelf to obtaining the highest resolution and accuracies possible at a well-defined site within protected waters. EAs marine science personnel are experienced in precisely measuring water depths, examining seafloor composition, performing hard target searches, evaluating deeper seabed stratigraphy, and identifying geologic hazards. In addition, EA has capabilities in underwater unexploded ordnance detection and mapping in both intertidal and subtidal environments.

Geotechnical, Geochemical, and Biological Seafloor Sampling

EAs capabilities include collection of surface, deep, and cross-sectional sediment samples as a means to evaluate the physical composition of the seabed and to ground-truth remote sensor data. Additionally, EA performs biological sediment collection to identify benthic organisms for habitat evaluations, body burden, and bioaccumulation studies. Our scientists are well-versed in the protocols required for whole sediment geochemical and whole sediment toxicity testing. EA maintains a fleet of in-house research vessels and has longstanding relationships with commercial marine contractors to deliver the resources necessary to conduct deep coring, box coring, and surficial sediment collections; process those samples; and execute the laboratory testing and statistical analyses.

Precision Navigation

Geodetic accuracy and repeatability in positioning are the basis for seafloor mapping and sampling services offered by EA. Global Positioning System and Global Navigation Satellite System data are used in conjunction with a variety of correction sources to meet the absolute, real-time precision requirements of each project, as well as their logistics and budget constraints. EA utilizes regional U.S. Coast Guard beacons, satellite-based augmentation system, and Real Time Kinematic and Virtual Reference Station networks to provide the necessary levels of horizontal and vertical control for each positional fix that is logged during an on-water survey operation.

Physical/Chemical Oceanography

EAs staff has extensive experience in obtaining the highest quality physical and chemical oceanographic measurements and a track record of success extending from the Atlantic coast of Florida to the Aleutian Islands. For site characterization and habitat assessment, EA collects wind, wave, and current information, and performs hydrodynamic modeling. We have capabilities to use robust and reliable meteorological sensors, acoustic current profilers and single point meters, as well as wave and tide recorders as part of buoy-, bottom-, and string-mounted instrument arrays that obtain high quality observation data above and below the air-water interface. EA also employs these sensors to measure and track turbidity, salinity, and thermal plumes from their sources out into the receiving waters as part of larger impact studies, defining extents of mixing zones and evaluating long-term fate and transport of plumes.

Listed below are examples of the Hydrographic Survey and Oceanographic Measurements services we offer our clients:

  • Precision Bathymetry and Navigation
  • Sediment/Substrate Mapping
  • Deeper Seabed Characterization
  • Benthic Habitat Assessments
  • Submerged Aquatic Vegetation Mapping
  • Water Column Profiling and Sampling
  • Bottom Boundary, Surface, and Water Column Current Measurements
  • Wave and Tidal Measurements
  • Hydrodynamic Modeling
  • Turbidity, Salinity, and Thermal Plume Monitoring
  • Fate and Transport Determinations