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@ARTICLE{Qu:188144,
author = {Qu, W. and Bogena, H. R. and Huisman, J. A. and
Vanderborght, J. and Schuh, M. and Priesack, E. and
Vereecken, H.},
title = {{P}redicting subgrid variability of soil water content from
basic soil information},
journal = {Geophysical research letters},
volume = {42},
number = {3},
issn = {0094-8276},
address = {Hoboken, NJ},
publisher = {Wiley},
reportid = {FZJ-2015-01605},
pages = {789-796},
year = {2015},
abstract = {Knowledge of unresolved soil water content variability
within model grid cells (i.e., subgrid variability) is
important for accurate predictions of land-surface energy
and hydrologic fluxes. Here we derived a closed-form
expression to describe how soil water content variability
depends on mean soil water content (σθ(<θ>)) using
stochastic analysis of 1-D unsaturated gravitational flow
based on the van Genuchten-Mualem (VGM) model. A sensitivity
analysis showed that the n parameter strongly influenced
both the shape and magnitude of the maximum of σθ(<θ>).
The closed-form expression was used to predict σθ(<θ>)
for eight data sets with varying soil texture using VGM
parameters obtained from pedotransfer functions that rely on
available soil information. Generally, there was good
agreement between observed and predicted σθ(<θ>) despite
the obvious simplifications that were used to derive the
closed-form expression. Furthermore, the novel closed-form
expression was successfully used to inversely estimate the
variability of hydraulic properties from observed σθ(<θ>)
data.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255) / 255 - Terrestrial Systems: From Observation to
Prediction (POF3-255)},
pid = {G:(DE-HGF)POF3-255 / G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000351355600016},
doi = {10.1002/2014GL062496},
url = {https://juser.fz-juelich.de/record/188144},
}