Bridge Scour Monitoring Products
Streambed scouring, the eroding away of streambed material that supports bridges, has been the cause of disasters throughout the world. Scouring occurs as fast-moving stream water flows around bridge support structures and abutments. State and County Department of Transportation bridge inspectors and managers need accurate, cost-effective, and easy-to-use measurement systems that can identify potential scour and alert proper authorities as the event is occurring.
ETI offers a variety of scour measurement techniques because each bridge has its own unique potential scour environment with its own set of requirements. Regardless of the technique used, if scour is detected each system will provide automated notification on a 24/7 basis to alert responsible bridge safety personnel.
Bridge Monitor (BrMo-20) Master Unit
The Master Unit typically includes a data logger, communications module (cell, satellite or radio) stream water level, tilt sensor, battery and solar panel. Data from the Master Unit is received and stored on the Bridge Monitor Cloud Server for access and display.
Sonar measures streambed elevation using a rapid series of soundings. If scour has caused the elevation of the streambed to decrease significantly, an alert condition is initiated.
Sliding Magnetic Collar
A cylindrical collar with built-in magnets is free to slide down a stainless steel support mast as the streambed erodes providing the elevation of the streambed within the scour area.
Float-out devices are buried at scour-prone locations near the bridge. Should scour occur sufficiently to release the device, the buoyant float-out rises to the water surface, activating an internal transmitter.
A series of accelerometers housed inside a steel reinforced hose at 1-foot intervals is augured vertically into the streambed to depths up to 80 feet. As scour occurs the vibration sensors become active and notification is provided in real-time.
Video cameras are used to monitor the real-time conditions of the stream, structural elements of the bridge and vehicular traffic.