Campbell Scientific TDR systems monitor slope movement of bluffs on California coast Railway Alert System T he North County Transit District (NCTD) of San Diego County, California, determined that three seg- ments of railway track above coastal bluffs in Del Mar should be monitored for dangerous slope movement. This led to the development of a continuous monitoring system along 3,300 ft (1,000 m) of track. Because of the length to be monitored, the use of conventional single-point monitoring systems such as multiple tiltmeters or in-place inclinometers (IPIs) was impractical. Bluff failure could occur anywhere along the track, so the use of single-point instruments would require a large number of sensors and monitors. Instead, it was proposed to install horizontal time-domain

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