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JDR Vol.8 No.1 pp. 81-89
(2013)
doi: 10.20965/jdr.2013.p0081

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Application of Electrical Resistivity Imaging for MeasuringWater Content Distribution on Hillslopes

Yosuke Yamakawa*, Naoya Masaoka**, Ken’ichirou Kosugi**,
Yasuyuki Tada***, and Takahisa Mizuyama**

*Educational Unit for Adaptation to Extreme Weather Conditions (GCOE-ARS Unit), Center for the Promotion of Interdisciplinary Education and Research (C-PIER), Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

**Laboratory of Erosion Control, Department of Forest Science, Graduate School of Agriculture, Kyoto University, Oiwake-Cho, Kitashiraka, Sakyo-ku, Kyoto 606-8502, Japan

***Laboratory of Hillslope Conservation, Department of Soil and Water Conservation, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan

Received:
December 3, 2012
Accepted:
January 5, 2013
Published:
February 1, 2013
Creative Commons License
Keywords:
ERI (electrical resistivity imaging), soil water content, shallow landslide, Archie���s equation, CPMP (combined penetrometer-moisture probe)
Abstract
Electrical resistivity imaging (ERI) as a method for effectively evaluating soil water content distribution on natural hillslopes was validated by combining ERI technique with the invasive measurement of volumetric water content (θ) using a combined penetrometermoisture probe (CPMP) on a hillslope in a head-water catchment underlain by weathered granite porphyry. There was a reasonable correlation (R2= 0.54) between θ and electrical resistivity (ρ). The correlation between (θ and ρ measured on two natural hillslopes in a head-water catchment underlain by weathered granite in our previous studies was also analyzed, and there was some reasonable correlation (R2= 0.33 to 0.53) between θ and ρ within each slope, indicating the potential of ERI for quantitatively evaluating moisture conditions within soil layers of natural hillslopes based on field-scale calibrations with invasive methods. These θ-ρ datasets were roughly consistent with a common fitted functionalmodel (Archie’s equation) (R2= 0.37), indicating the possibility of quantitatively evaluating θ of soil layer on natural hillslopes using ERI without directly measuring θ using any invasive method, although results still showed the importance of combining invasive methods with ERI and obtaining sitespecified θ-ρ correlation models for providing a more accurate spatial distribution of θ within the soil mantle. Inconsistencies between θ and ρ within datasets may be significantly attributable to not only limitations on spatial resolution of ERI technique related to the issue of representative volumes of the technique and inversion analysis to obtain ρ profiles but also the assumption that soil properties and pore-water resistivity of the entire slope are homogeneous. Using a CPMP as invasive method, detecting heterogeneous θ distribution more accurately than ERI technique, together with ERI is one of the most reasonable ways of effectively quantifying soil water content distribution on natural hillslopes.
Cite this article as:
Y. Yamakawa, N. Masaoka, K. Kosugi, Y. Tada, and T. Mizuyama, “Application of Electrical Resistivity Imaging for MeasuringWater Content Distribution on Hillslopes,” J. Disaster Res., Vol.8 No.1, pp. 81-89, 2013.
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