Hydro1   Bathymetry   Hydrographic Survey   MBES

Hydrographic Surveys

SeaVision utilizes numerous techniques to perform accurate, high-resolution surveys based on a project's clearly defined objectives. Hydrographic surveys provide critical information about the depth and character of the bottom to clients around the world, in every phase of maintenance, development, or construction project. We have demonstrated our out-of-the-box approach to tackling logistical challenges (specifically in locations with limited access to structures/features of interest).

Simply put, Hydrographic surveys tell us how deep the bottom is and what it's like? Some of the techniques we most frequently employ are:

  • Real-Time Kinematic GPS Positioning
  • Multibeam Echosounding
  • Single Beam Echosounding
  • Dual and Multi-Frequency Echosounding

RTK-GPS positioning provides us with highly accurate horizontal and vertical positioning which compensates (real-time) for changing water level conditions. Single beam echosounding can be an effective tool for precise depth measurements, especially in shallow environments.

Multibeam echosounding generates "dense" data sets with accurate coverage of nearly 100% of the bottom, resulting in highly detailed bathymetric maps. Dual/multi-frequency echosounding can also be deployed to measure the thicknesses of sediment layers or to search for buried objects and utilities.

ROV1   VideoRay Pro4   VideoRay Pro4  

ROV Services

Since its founding, SeaVision has utilized ROVs to offer cutting-edge remote underwater inspection and research services. Remotely operated vehicles (ROVs) provide a valuable platform for investigating deep locations and sites with confined access, where divers would be subject to potentially severe risk. ROVs possess the capability to simultaneously collect information from multiple auxiliary systems (still and video cameras; external lighting; temperature, depth, and heading sensors, etc.).

SeaVision often utilizes our VideoRay Pro4 mini-ROV, but we also work with a select group of inshore ROV specialists in order to provide more substantial coordinated ROV services, when necessary. The Pro4 is a small but capable ROV, venturing to depths of 1000 feet, penetrating tunnels up to 1750 feet, carrying multiple auxiliary sensory/support systems, and even allowing for remote control of a range of custom-developed tools.

Investigation1   Investigation2   Investigation3   Investigation4   Investigation5

Underwater Investigations

Sometimes, the full characterization of an underwater site requires a variety of remote surveying or sampling techniques in order to gather the information necessary to fully support the design, construction, or management of an underwater asset. Our team draws from a range of acoustic, geophysical, and visual systems to develop in-depth characterizations of underwater environments.

We provide survey results in geographically referenced, scaled, industry-standard formats to be used for project design and construction phases, but when high-resolution bathymetric imaging is insufficient for full site characterization, SeaVision draws upon additional techniques to meet our clients’ objectives. Our repertoire includes underwater solutions that meet or help meet many of the common objectives of any marine maintenance or construction project, such as identifying potential navigational hazards, locating buried pipelines and cable crossings, or the characterization of submerged features.

The completion of a project can depend on our ability to adapt (and even repurpose) industry standard technology and tools. The underwater investigation techniques that we provide are:

  • Sidescan sonar surveys
  • Sub-bottom profiling
  • Magnetometer surveys
  • Scanning sonar surveys
  • Sediment sampling
  • 3-D laser scanning

We deliver these solutions as both stand-alone services and within fully-integrated survey project reports. Don't hesitate to reach out to us if your question hasn't been answered or if your situation seems particularly unique. We're always up for a challenge.

Sediment Core   Sediment Core   Sediment Core

Sediment Sampling & Characterization

Our years of experience supporting sensitive dredging projects, have afforded us the expertise to begin offering sediment sampling and characterization services, which can prove essential during planning, design, and construction phases of a variety of underwater dredging projects.

Utilizing vibracore, direct push, grab, and customized sampling techniques, we can provide clients with a turn-key sampling and sediment characterization solution to meet their project requirements.