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A Study on the Geotechnical Property caused by Contact Volume between Weathered Soils and Moisture Sensor for Application of Field Monitoring  

Kim, Man-Il (Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources)
Chae, Byung-Gon (Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources)
Publication Information
The Journal of Engineering Geology / v.18, no.3, 2008 , pp. 311-319 More about this Journal
Abstract
Evaluation of an amplitude domain reflectometry (ADR) type soil moisture sensor as ThetaProbe ML2x using the response of frequency impedance was performed in a variety of soil porous media such as Jumunjin standard sand, weathered granite soil at Sangju area, and weathered gneiss soil at Jangsu area. The tested soils were classified with a dried condition and a wetted condition for comparing with soil volumetric water content under different installed depths of the measurement sensor. In the results the part of measurement rod including one signal rod and three shield rod 6cm in length was found to decrease the variation of measurement output voltage with insert 5cm over into the soil porous media. The measurement output voltage was verified to more stable output voltage under weathered granite soils and weathered gneiss soils contained the fine grain materials such as clay and silt minerals than the gradual grain material like as the standard sands. Therefore, measurement values by soil moisture sensor can be offered the more stable values when an contact volume between soil porous media and measurement sensor increase.
Keywords
soil moisture sensorweathered soilsoutput voltagevolumetric water content;
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Times Cited By KSCI : 2  (Citation Analysis)
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