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Environmental Earth Sciences

, Volume 65, Issue 5, pp 1523–1533 | Cite as

Soil column experiments to quantify vadose zone water fluxes in arid settings

  • H. PfletschingerEmail author
  • I. Engelhardt
  • M. Piepenbrink
  • F. Königer
  • R. Schuhmann
  • A. Kallioras
  • C. Schüth
Special Issue

Abstract

For the determination of groundwater recharge processes in arid environments, vadose zone water fluxes and water storage should be considered. To better understand and quantify vadose zone processes influencing groundwater recharge, a soil column experimental setup has been developed that mimics arid atmospheric conditions and measures water and temperature fluxes in high temporal and spatial resolution. The focus of the experiment was on the determination of water infiltration, redistribution, evaporation and percolation under non-isothermal conditions. TDR rod sensors and a specific TDR “Taupe” cable sensor were used for water content measurements and allowed the infiltration fronts to be traced over the whole column length. Applying single irrigations of different amount and intensity showed the applicability of the experimental setup for the measurement of water movement in the unsaturated soil column.

Keywords

Vadose zone Column experiments Groundwater recharge TDR Unsaturated water flow 

List of symbols

Ka

Measured relative dielectric permittivity (–)

L

TDR probe length (m)

La

TDR apparent probe length (signal length along the probe) (m)

qtotal

Total water fluxes (ml)

qL

Liquid water fluxes (ml)

qv

Vapor fluxes (ml)

qh

Isothermal water fluxes (ml)

qT

Thermal water fluxes (ml)

RC

Reflection coefficient (–)

T

Temperature (°C)

TDR

Time domain reflectometry

VWC/θv

Volumetric water content (cm³/cm³)

Notes

Acknowledgments

Financial support for this research has been kindly provided by the Federal Ministry of Education and Research (BMBF) through the “International Water Research Alliance Saxony” (IWAS) and through the “International Postgraduate Studies in Water Technologies” (IPSWaT) Program of its International Bureau. Special thanks for conceptual help are due to C. Hofstee from The Netherlands Organization (TNO) (Utrecht, The Netherlands) and M. Oostrom and T. Wietsma from the Environmental Molecular Sciences Laboratory (EMSL) (Richland, WA, USA).

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • H. Pfletschinger
    • 1
    Email author
  • I. Engelhardt
    • 1
  • M. Piepenbrink
    • 1
  • F. Königer
    • 2
  • R. Schuhmann
    • 2
  • A. Kallioras
    • 1
  • C. Schüth
    • 1
  1. 1.Technische Universität DarmstadtInstitute of Applied GeosciencesDarmstadtGermany
  2. 2.KIT, Institute of Functional InterfacesEggenstein-LeopoldshafenGermany

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