Sector scans are used to create an underwater acoustic image of an object or structure. These images are then used to visually assess the condition without the need for a dive inspection. Brennan often uses these images on dam structures to help identify any defects that may be occurring. Oftentimes these images are paired with digital photographs or scale drawings to show an overview of the entire area of concern both above and below the waterline.
Sector scans have several advantages. They allow for real-time, direct feedback, much like underwater video. They can be configured to scan the river or lake bottom for scour, debris, and submerged objects. In another configuration, they can be used to scan submerged structures with vertical surfaces such as sheet pile walls, pier noses, trash racks, etc. They can be used in zero-visibility conditions and in conditions where dive inspections are too dangerous to carry out.
Sector Scans are Effective in Imaging:
- Pier Noses
- Sheeting Walls
- Underwater Obstacles
- Intake Bays
- Trash Racks