Scour monitor and seabed distance

Distance to seabed measurements at four distances from a vertical structure.

The Scour monitorChanges in seabed level (scour) are measured in real-time and relayed back from the field, even during storm periods, thus providing invaluable information for modelers of these crucial changes, as they occur.

The Scour monitor operates as a four beam echo sounder. The intensity of the acoustic return signal along these four narrow beams, with angles 10, 20, 30, and 45 degrees from the vertical is measured, and due to that the bottom is a hard reflector the acoustic reflection from this provides a strong peak in signal amplitude, which is used to determine the exact distance along the beams. The software then corrects for tilt and beam angles, to provide true bottom elevation as a function of time. Data are displayed both graphically and numerically.


The bottom elevation data is either displayed online, on a password-protected web site, or stored inside the Scour monitor for subsequent analysis.
The Scour Monitor comes in two different versions; one which is used for 0.1 to 10 meters distance to the bottom, and one which is used for 7 to 30 meters distance. The instrument has no protruding parts, making mounting arrangements simple, with a low risk of conflict with other types of equipment and activities in the area.

Applications
The Scour monitor is an inexpensive, yet powerful way of getting vital data about dynamic changes over time in bottom elevation around a wide range of physical structures.

  • The most common application is monitoring of scour hole development around offshore wind turbine monopiles. The Scour monitor is in this case clamped to the turbine, and can either run on internal batteries and store the data on its internal recorder, or be cabled to a junction box for online data transmission, either to a SCADA system or directly to the web.  
  • Bridge foundations are commonly associated with scour, and this is another application where the Scour monitor can provide valuable data about bottom changes as a function of time. Again, data can be displayed online or stored inside the Scour monitor for subsequent analysis.
  • In dams a build-up of sediments may occur over time. This can be monitored using the Scour monitor.
  • Deposits in conjunction with dredging and mining activity are commonly restricted to certain areas, and spreading of polluted material outside of these is restricted. The Scour monitor can be used to monitor this, and in some cases a combination between the Scour monitor and current meters can provide an even better understanding of what is going on.
Related content
File Scour monitor brochure