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@ARTICLE{Vanderborght:829450,
author = {Vanderborght, Jan and Fetzer, Thomas and Mosthaf, Klaus and
Smits, Kathleen M. and Helmig, Rainer},
title = {{H}eat and water transport in soils and across the
soil-atmosphere interface: 1. {T}heory and different model
concepts},
journal = {Water resources research},
volume = {53},
number = {2},
issn = {0043-1397},
address = {[New York]},
publisher = {Wiley},
reportid = {FZJ-2017-03149},
pages = {1057 - 1079},
year = {2017},
abstract = {Evaporation is an important component of the soil water
balance. It is composed of water flow and transport
processes in a porous medium that are coupled with heat
fluxes and free air flow. This work provides a comprehensive
review of model concepts used in different research fields
to describe evaporation. Concepts range from nonisothermal
two-phase flow, two-component transport in the porous medium
that is coupled with one-phase flow, two-component transport
in the free air flow to isothermal liquid water flow in the
porous medium with upper boundary conditions defined by a
potential evaporation flux when available energy and
transfer to the free airflow are limiting or by a critical
threshold water pressure when soil water availability is
limiting. The latter approach corresponds with the classical
Richards equation with mixed boundary conditions. We compare
the different approaches on a theoretical level by
identifying the underlying simplifications that are made for
the different compartments of the system: porous medium,
free flow and their interface, and by discussing how
processes not explicitly considered are parameterized.
Simplifications can be grouped into three sets depending on
whether lateral variations in vertical fluxes are
considered, whether flow and transport in the air phase in
the porous medium are considered, and depending on how the
interaction at the interface between the free flow and the
porous medium is represented. The consequences of the
simplifications are illustrated by numerical simulations in
an accompanying paper.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000398568800005},
doi = {10.1002/2016WR019982},
url = {https://juser.fz-juelich.de/record/829450},
}