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@ARTICLE{Vereecken:55663,
author = {Vereecken, H. and Kasteel, R. and Vanderborght, J. and
Harter, J.},
title = {{U}pscaling {H}ydraulic {P}roperties and {S}oil {W}ater
{F}low {P}rocesses in {H}eterogeneous {S}oils: {A} {R}eview},
journal = {Vadose zone journal},
volume = {6},
issn = {1539-1663},
address = {Madison, Wis.},
publisher = {SSSA},
reportid = {PreJuSER-55663},
pages = {1 - 28},
year = {2007},
note = {Record converted from VDB: 12.11.2012},
abstract = {This review covers, in a comprehensive manner, the
approaches available in the literature to upscale soil water
processes and hydraulic parameters in the vadose zone. We
distinguish two categories of upscaling methods: forward
approaches requiring information about the spatial
distribution of hydraulic parameters at a small scale, and
inverse modeling approaches requiring information about the
spatial and temporal variation of state variables at various
scales, including so-called "soft data". Geostatistical and
scaling approaches are crucial to upscale soil water
processes and to derive large-scale effective fluxes and
parameters from small-scale information. Upscaling
approaches include stochastic perturbation methods, the
scaleway approach, the stream-tube approach, the aggregation
concept, inverse modeling approaches, and data fusion. With
all upscaling methods, the estimated effective parameters
depend not only on the properties of the heterogeneous flow
field but also on boundary conditions. The use of the
Richards equation at the field and watershed scale is based
more on pragmatism than on a sound physical basis. There are
practically no data sets presently available that provide
sufficient information to extensively validate existing
upscaling approaches. Use of numerical case studies has
therefore been most common. More recently and still under
development, hydrogeophysical methods combined with
ground-based remote sensing techniques promise significant
contributions toward providing high-quality data sets.
Finally, most of the upscaling literature in vadose zone
research has dealt with bare soils or deep vadose zones.
There is a need to develop upscaling methods for real world
soils, considering root water uptake mechanisms and other
soil-plant-atmosphere interactions.},
keywords = {J (WoSType)},
cin = {ICG-4 / JARA-ENERGY / JARA-SIM},
ddc = {550},
cid = {I:(DE-Juel1)VDB793 / $I:(DE-82)080011_20140620$ /
I:(DE-Juel1)VDB1045},
pnm = {Terrestrische Umwelt},
pid = {G:(DE-Juel1)FUEK407},
shelfmark = {Environmental Sciences / Soil Science / Water Resources},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000245811500001},
doi = {10.2136/vzj2006.0055},
url = {https://juser.fz-juelich.de/record/55663},
}