Estimation of effective unsaturated hydraulic conductivity tensor using spatial moments of observed moisture plume

Tian-Chyi J Yeh, Ming Ye, Raziuddin Khaleel

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

[1] Knowledge of unsaturated zone hydraulic properties is critical for many environmental and engineering applications. Various stochastic methods have been developed during the past 2 decades to estimate the effective unsaturated hydraulic properties. Independent of these stochastic methods, we develop in this paper a practical approach to estimate the three-dimensional (3-D) effective unsaturated hydraulic conductivity tensor using spatial moments of 3-D snapshots of a moisture plume under transient flow conditions. An application of the new approach to data collected at the Hanford Site in southeastern Washington State yields an effective unsaturated hydraulic conductivity tensor that exhibits moisture-dependent anisotropy. The effective hydraulic conductivities compare well with laboratory-measured unsaturated hydraulic conductivity data from small core samples; they also reproduce the general behavior of the observed moisture plume at the site. We also define a moisture diffusivity length concept which we use in conjunction with estimated correlation scales of the geologic media at the field site to explain deviations between the observed and simulated plumes based on the derived effective hydraulic properties.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalWater Resources Research
Volume41
Issue number3
DOIs
StatePublished - Mar 2005

Fingerprint

unsaturated hydraulic conductivity
Hydraulic conductivity
Tensors
hydraulic conductivity
fluid mechanics
Moisture
hydraulic property
plume
moisture
Hydraulics
transient flow
diffusivity
Core samples
engineering
vadose zone
Anisotropy
anisotropy
methodology
sampling
method

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Aquatic Science
  • Water Science and Technology

Cite this

Estimation of effective unsaturated hydraulic conductivity tensor using spatial moments of observed moisture plume. / Yeh, Tian-Chyi J; Ye, Ming; Khaleel, Raziuddin.

In: Water Resources Research, Vol. 41, No. 3, 03.2005, p. 1-12.

Research output: Contribution to journalArticle

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