First approximations of soil moisture retention curves using the filter-paper method

Duke U. Ophori, Beena Maharjan

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Relationships between gravimetric soil moisture content (w) and matric potential (φ(m)), and between volumetric soil moisture content (θ(v)) and pressure head (h) were approximated for the unsaturated zone on Long Island, New York. Soil samples were collected from two sites using a hand auger. The soil moisture content was determined using the filter-paper (w(f)) and gravimetric (w) methods, respectively. The w(f) was then used in an empirical equation to estimate φ(m). Each set of φ(m) and w was combined with a straight-line empirical model to obtain a w(φ(m)) relationship. Soil φ(m) was converted to h, and w to the volumetric moisture content θ(v), in order to produce a θ(v)(h) curve. Graphical and statistical comparison showed that the resulting θ(v)(h) curves fell within one order of magnitude of similar curves generated by a more sophisticated non-linear model developed previously. The simplicity and low cost of the filter-paper approach described in this study recommends it for preliminary studies of hydraulic properties in the unsaturated zone. Copyright (C) 2000 John Wiley and Sons, Ltd.

Original languageEnglish
Pages (from-to)1131-1138
Number of pages8
JournalHydrological Processes
Volume14
Issue number6
DOIs
StatePublished - 30 Apr 2000

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moisture content
soil moisture
filter
vadose zone
matric potential
hydraulic property
soil
method
paper
cost

Keywords

  • Filter-paper
  • Matric potential
  • Pressure head
  • Retention curves
  • Soil moisture content

Cite this

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abstract = "Relationships between gravimetric soil moisture content (w) and matric potential (φ(m)), and between volumetric soil moisture content (θ(v)) and pressure head (h) were approximated for the unsaturated zone on Long Island, New York. Soil samples were collected from two sites using a hand auger. The soil moisture content was determined using the filter-paper (w(f)) and gravimetric (w) methods, respectively. The w(f) was then used in an empirical equation to estimate φ(m). Each set of φ(m) and w was combined with a straight-line empirical model to obtain a w(φ(m)) relationship. Soil φ(m) was converted to h, and w to the volumetric moisture content θ(v), in order to produce a θ(v)(h) curve. Graphical and statistical comparison showed that the resulting θ(v)(h) curves fell within one order of magnitude of similar curves generated by a more sophisticated non-linear model developed previously. The simplicity and low cost of the filter-paper approach described in this study recommends it for preliminary studies of hydraulic properties in the unsaturated zone. Copyright (C) 2000 John Wiley and Sons, Ltd.",
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First approximations of soil moisture retention curves using the filter-paper method. / Ophori, Duke U.; Maharjan, Beena.

In: Hydrological Processes, Vol. 14, No. 6, 30.04.2000, p. 1131-1138.

Research output: Contribution to journalArticle

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