KANE GeoTech, Inc. - A leader in geotechnical engineering.
Del Mar Bluffs Slope Monitoring System
Location:
San Diego County, California
Timeframe:
2003 - Present
Client:
North County Transportation District , Oceanside, California
Description:
The desire to monitor a section of coastal bluff for slope
movements along the North County Transportation District/Amtrak tracks in
Del Mar, San Diego County, California led to the development of a continuous
monitoring system along approximately 1000 m of track. Because of the length
to be monitored, conventional single-point monitoring systems such as
multiple tiltmeters or in-place inclinometers (IPIs) were deemed
impracticable. Instead, horizontal time domain reflectometry (TDR) coaxial
cable sensors were installed along high-concern segments of the track.
The Del Mar Bluffs TDR monitoring system uses three on-site dataloggers and reflectometers to monitor three different sections of the bluff. Each reflectometer is connected to two sensors of up to 200 m long through a multiplexer. The sensors are pulsed every several minutes to determine if sensor deformation has occurred. In the event of a deformation, a signal is sent to a central monitoring unit where an automated telephone dialer notifies railway personnel of possible bluff movement.
The system, designed by KANE GeoTech Inc. and Applied Geomechanics, Inc. of Santa Cruz, CA, utilizes a Campbell Scientific MD9 multidrop ethernet with 3 monitoring stations using CR10X dataloggers and TDR100 reflectometers. The Central Monitoring Unit includes power supplies, a CR23X datalogger, and an automated telephone dialing system.
Download a paper describing the system.
The Del Mar Bluffs TDR monitoring system uses three on-site dataloggers and reflectometers to monitor three different sections of the bluff. Each reflectometer is connected to two sensors of up to 200 m long through a multiplexer. The sensors are pulsed every several minutes to determine if sensor deformation has occurred. In the event of a deformation, a signal is sent to a central monitoring unit where an automated telephone dialer notifies railway personnel of possible bluff movement.
The system, designed by KANE GeoTech Inc. and Applied Geomechanics, Inc. of Santa Cruz, CA, utilizes a Campbell Scientific MD9 multidrop ethernet with 3 monitoring stations using CR10X dataloggers and TDR100 reflectometers. The Central Monitoring Unit includes power supplies, a CR23X datalogger, and an automated telephone dialing system.
Download a paper describing the system.
