Telephone: 315-386-2776
Email: info@thewassociates.com

Water

Projects on the water present unique challenges to professional engineers, scientists, planners, and contractors. Thew Associates has extensive experience working in marine environments providing seamless topographic and utility mapping from upland surveys through transition zones and into deeper water. Working under the direction of a Certified Hydrographer, the Thew Associates hydrographic survey group has the requisite equipment and expertise to undertake a wide range of water based projects.

hydrographic Services

GPS Positioning

Centimeter horizontal and vertical accuracies
Sample layout and location
Sampling vessel navigation

Sediment Sampling and Analysis

Vibracore and gravity core sample collection
Sub-bottom profiling
Chemical and geotechnical analysis (subcontracted)

Backscatter Data

Side Scan Sonar and Snippets
Seafloor imagery and classification
Object detection
Full Water Column

Sub Bottom Profiling

Identify and characterize seafloor strata
Buried object detection
Benthic habitat characterization

Marine Magnetometer Surveys

Magnetic object detection
Identifies submerged cables and pipelines
Archeological features

Acoustic Doppler Current Profiling (ADCP)

Velocity and Current Studies
Construction and remediation design data
Flow rate and direction determination
Hydraulic modeling support
Wave Height Studies And Monitoring

Bathymetry

Single- and multi-beam acoustic data collection
Slope monitoring
Dredge support services
1. Pre- and post-dredge surface topography
2. As-built surface topography
3. Dredge volume calculations