Rapid Benthic Surveys

Ocean Ecology's original underwater video system

Ocean Ecology has carried out a number of rapid benthic surveys. This is done by running a grid pattern over the area to be surveyed, and following the bottom contours with an underwater video camera. The camera connects to a flat-screen monitor and a digital video recorder for live viewing and recording. Depth and position are automatically logged, and the DGPS antenna can be positioned directly above the camera for maximum accuracy. The video image is overlain with time and position data from the ship's DGPS. Thus, it is then possible to go back to any location on the video for a more detailed examination, or to collect samples with a grab or ROV.

A DVD can be produced which contains both a hydrographic chart showing the survey track lines and the video. Each trackline consists of a series of points, and is associated with a data base containing information on benthic organisms, substrate, time, position (latitude and longitude), and depth.

The research vessel Moody Blue has a forward scanning sonar for safe operation in shallow water, and electronic chart plotting software for accurate navigation. Captain Hall has had many years experience with similar shallow water operations. Thus, on high spring tides, we are often able to carry out our video survey well into the intertidal zone.

Many of our surveys have been done in isolated areas of the Northcoast of British Columbia. The research vessel Moody Blue is well equipped for extended trips and working in remote regions.

Click image to to enlarge.