Two-Dimensional Probabilistic Infiltration Analysis in a Hillslope Using First-Order Moment Approach

Rui Xuan Tang, Jing Sen Cai, Tian-Chyi J Yeh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A first-order moment analysis method is introduced to evaluate the pore-water pressure variability within a hillslope due to spatial variability in saturated hydraulic conductivity (K s ) during rainfall. The influences of the variance of the natural logarithm of K s (ln K s ), spatial structure anisotropy of ln K s , and normalized vertical infiltration flux (q) on the evaluations of the pore-water pressure uncertainty are investigated. Results indicate different responses of pressure head variability in the unsaturated region and the saturated region. In the unsaturated region, a larger variance of ln K s , a higher spatial structure anisotropy, and a smaller q lead to a larger variability in pressure head, while in the saturated region, the variability in pressure head increases with the increase of variance of ln K s , the decrease of spatial structure anisotropy, or the increase of q. These variables have great impacts on the range of fluctuation of the phreatic surface within the hillslope. The influences of these three variables on the variance of pressure head within the saturated region are greater than those within the unsaturated region, and the variance of ln K s has the greatest impact. These results yield useful insight into the effects of heterogeneity on pressure head and uncertainty associated with predicted flow field.

Original languageEnglish (US)
Pages (from-to)226-237
Number of pages12
JournalGroundwater
Volume57
Issue number2
DOIs
StatePublished - Mar 1 2019

Fingerprint

hillslope
Infiltration
infiltration
Anisotropy
anisotropy
porewater
Hydraulic conductivity
analysis
flow field
Rain
hydraulic conductivity
Water
Flow fields
Fluxes
rainfall

ASJC Scopus subject areas

  • Water Science and Technology
  • Computers in Earth Sciences

Cite this

Two-Dimensional Probabilistic Infiltration Analysis in a Hillslope Using First-Order Moment Approach. / Tang, Rui Xuan; Cai, Jing Sen; Yeh, Tian-Chyi J.

In: Groundwater, Vol. 57, No. 2, 01.03.2019, p. 226-237.

Research output: Contribution to journalArticle

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