KANE GeoTech, Inc. - A leader in geotechnical engineering.
Seawall Monitoring System
Location:
San Luis Obispo County, California
Timeframe:
2008
Description:
The monitoring system consists of a Campbell Scientific, Inc. CR1000 data logger
in a weatherproof enclosure. The enclosure also houses a voltage regulator and back-up battery
for the 12-V DC system. Connected to the data logger are two tiltmeters and an AVW4 vibrating
wire interface with two VWPs attached to it. The data logger is programmed to read the voltage
output from two tiltmeters and the two VWPs. The program converts the voltage from the tilt
meters to the degree of tilt and the actual movement of the top of the wall in inches. It also
converts the voltage from the VWPs to the hydrostatic head behind the wall in units of feet.
The tiltmeters are securely fastened on mounting brackets and are located on top of the retaining
wall. The two VWPs are grouted approximately 4.5-ft into the lower part of the retaining wall.
Communications are by means of an Airlink Raven 110 GPRS IP addressable modem using a dynamic IP
address acquired through the CrossBridge Imotient "tunnel."
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