Numerical modeling of free-drainage water samplers in the shallow vadose zone

R. Zhang, A. W. Warrick, J. F. Artiola

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A finite element model was used to simulate the performance of a free-drainage sampler. This device may be used to collect soil water by free drainage in the shallow vadose zone. A unique feature of this sampling device is that it serves as a barrier to flow and creates a locally saturated region in an otherwise unsaturated system. Steady and unsteady flows were modeled assuming the hydraulic functions of van Genuchten and Gardner. Results include flux into the sampler and distribution of hydraulic head as functions of soil hydraulic properties, background soil flux and sampler size.

Original languageEnglish (US)
Pages (from-to)251-258
Number of pages8
JournalAdvances in Water Resources
Issue number4
StatePublished - 1992
Externally publishedYes


  • free-drainage water sampler
  • modeling
  • unsaturated flow

ASJC Scopus subject areas

  • Water Science and Technology


Dive into the research topics of 'Numerical modeling of free-drainage water samplers in the shallow vadose zone'. Together they form a unique fingerprint.

Cite this