Surface flux boundary simplifications for flow through clay under landscaped conditions

H. B. Dye, Sandra Houston, W. N. Houston

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

2 Citations (Scopus)

Abstract

The quality of the solution of moisture flow through expansive soils for the purpose of depth of moisture influence determination for residential foundation design depends on properly described flux boundary conditions including appropriate environmental factors and inclusion of the microclimate created by human activity. In this study, both climatic and human imposed conditions typical to Phoenix, Arizona, were considered in 1-D unsaturated flow modeling. Many years of recorded precipitation data were obtained, and common irrigation practice from surveys of municipalities, together with evapotranspiration data from the regions, were used to determine the surface flux conditions for modeling. Rigorously described surface flux boundary conditions were used in the analyses, and simplifications to these conditions were systematically made to determine the impact of simplified boundary conditions on the final solution. It was found that major simplifications, through averaging of flux conditions and increased time-steps for application, result in only negligible difference in computed matric suction compared to more detailed simulations of flux when the capacity of the soil to absorb applied surface water is not exceeded, such as for the desert landscape conditions of this study. Otherwise, as observed for the turf irrigation case of this study, averaging surface flux can result in significant over-estimate of the extent and degree of wetting in the profile.

Original languageEnglish (US)
Title of host publicationUnsaturated Soils: Advances in Geo-Engineering - Proceedings of the 1st European Conference on Unsaturated Soils, E-UNSAT 2008
Pages805-810
Number of pages6
StatePublished - 2008
Event1st European Conference on Unsaturated Soils, E-UNSAT 2008 - Durham, United Kingdom
Duration: Jul 2 2008Jul 4 2008

Other

Other1st European Conference on Unsaturated Soils, E-UNSAT 2008
CountryUnited Kingdom
CityDurham
Period7/2/087/4/08

Fingerprint

surface flux
Clay
boundary condition
clay
Fluxes
moisture
irrigation
unsaturated flow
expansive soil
flow modeling
Boundary conditions
lawns and turf
microclimate
Irrigation
wetting
suction
evapotranspiration
deserts
soil
surface water

ASJC Scopus subject areas

  • Soil Science
  • Geotechnical Engineering and Engineering Geology

Cite this

Dye, H. B., Houston, S., & Houston, W. N. (2008). Surface flux boundary simplifications for flow through clay under landscaped conditions. In Unsaturated Soils: Advances in Geo-Engineering - Proceedings of the 1st European Conference on Unsaturated Soils, E-UNSAT 2008 (pp. 805-810)

Surface flux boundary simplifications for flow through clay under landscaped conditions. / Dye, H. B.; Houston, Sandra; Houston, W. N.

Unsaturated Soils: Advances in Geo-Engineering - Proceedings of the 1st European Conference on Unsaturated Soils, E-UNSAT 2008. 2008. p. 805-810.

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

Dye, HB, Houston, S & Houston, WN 2008, Surface flux boundary simplifications for flow through clay under landscaped conditions. in Unsaturated Soils: Advances in Geo-Engineering - Proceedings of the 1st European Conference on Unsaturated Soils, E-UNSAT 2008. pp. 805-810, 1st European Conference on Unsaturated Soils, E-UNSAT 2008, Durham, United Kingdom, 7/2/08.
Dye HB, Houston S, Houston WN. Surface flux boundary simplifications for flow through clay under landscaped conditions. In Unsaturated Soils: Advances in Geo-Engineering - Proceedings of the 1st European Conference on Unsaturated Soils, E-UNSAT 2008. 2008. p. 805-810
Dye, H. B. ; Houston, Sandra ; Houston, W. N. / Surface flux boundary simplifications for flow through clay under landscaped conditions. Unsaturated Soils: Advances in Geo-Engineering - Proceedings of the 1st European Conference on Unsaturated Soils, E-UNSAT 2008. 2008. pp. 805-810
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