In situ measurement of the soil moisture content profile at a decomposed granite cut-slope

A. Tohari, M. Nishigaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Two selected sites at a decomposed granite cut-slope were instrumented with a rain gage and a series of ThetaProbes installed at depths up to 90 cm from the slope surface. The objective of this study was to evaluate the significance of antecedent soil moisture conditions in controlling the hydrologic responses of the soils at each site. The antecedent moisture content of the soil in site 1, in general, increases with depth. The response of the soil to saturation process is more or less confined to the shallow depth. On the other hand, the measurement data of the soil in site 2 showed that the near surface soil exhibits the higher antecedent moisture condition than the deeper soil. The ingress of the wetting front could reach depths greater than 90 cm during long period of rainfall. Thus, these results suggest that the hydrological response of the soils is spatially variable and is influenced by the antecedent soil moisture conditions within the soil profile. The presence of soil layers and the distribution of macro cracks within the soil profile and additional lateral source of moisture also may have significant influences on soil response to saturation process.

Original languageEnglish
Title of host publicationUnsaturated Soils
Subtitle of host publicationTheoretical and Numerical Advances in Unsaturated Soil Mechanics - Proceedings of the 4th Asia Pacific Conference on Unsaturated Soils
Pages301-306
Number of pages6
Publication statusPublished - Dec 1 2010
Event4th Asia Pacific Conference on Unsaturated Soils - Newcastle, NSW, Australia
Duration: Nov 23 2009Nov 25 2009

Publication series

NameUnsaturated Soils: Theoretical and Numerical Advances in Unsaturated Soil Mechanics - Proceedings of the 4th Asia Pacific Conference on Unsaturated Soils

Other

Other4th Asia Pacific Conference on Unsaturated Soils
CountryAustralia
CityNewcastle, NSW
Period11/23/0911/25/09

ASJC Scopus subject areas

  • Soil Science

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  • Cite this

    Tohari, A., & Nishigaki, M. (2010). In situ measurement of the soil moisture content profile at a decomposed granite cut-slope. In Unsaturated Soils: Theoretical and Numerical Advances in Unsaturated Soil Mechanics - Proceedings of the 4th Asia Pacific Conference on Unsaturated Soils (pp. 301-306). (Unsaturated Soils: Theoretical and Numerical Advances in Unsaturated Soil Mechanics - Proceedings of the 4th Asia Pacific Conference on Unsaturated Soils).