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@ARTICLE{Kuang:904472,
author = {Kuang, Xingxing and Jiao, Jiu Jimmy and Shan, Jipeng and
Yang, Zhenlei},
title = {{A} modification to the van {G}enuchten model for improved
prediction of relative hydraulic conductivity of unsaturated
soils},
journal = {European journal of soil science},
volume = {72},
number = {3},
issn = {0022-4588},
address = {Oxford [u.a.]},
publisher = {Wiley-Blackwell},
reportid = {FZJ-2021-06042},
pages = {1354 - 1372},
year = {2021},
note = {Kein Postprint vorhanden},
abstract = {Modelling of flow and transport in unsaturated soils
requires information on two fundamental hydraulic
properties: the soil water retention curve and relative
hydraulic conductivity. A soil's relative hydraulic
conductivity is frequently predicted from the soil water
retention curve. The most widely used combination is the van
Genuchten model for the soil water retention curve and the
Mualem model for relative hydraulic conductivity (VGM).
Previous studies show that the VGM model underestimates
measured relative hydraulic conductivity for soils with fine
textures; a sharp drop in relative hydraulic conductivity
can be seen near saturation. A new modification of the van
Genuchten soil water retention model is proposed with the
aim of improving the agreement between predicted and
measured relative hydraulic conductivity. The Brooks and
Corey-Burdine model is used to predict relative hydraulic
conductivity from the modified van Genuchten soil water
retention curve (MVG-BCB). The modified model assumes
independent m and n in the van Genuchten model but with
constraints n > 2 and 0 < m < 1. The MVG-BCB
model is evaluated by comparing calculated and measured data
for 59 soils that have widely varying soil textures, ranging
from sandstone to clay. The MVG-BCB model improves the
agreement between calculated and measured data for both the
soil water retention curve and relative hydraulic
conductivity. The MVG-BCB model is closer to measured
relative hydraulic conductivity data for most of the
selected soils and the sharp drop near saturation is
eliminated. Both the modified soil water retention curve and
relative hydraulic conductivity functions are smooth curves
and can easily be incorporated into vadose zone flow and
transport modellings.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {2173 - Agro-biogeosystems: controls, feedbacks and impact
(POF4-217)},
pid = {G:(DE-HGF)POF4-2173},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000580992700001},
doi = {10.1111/ejss.13034},
url = {https://juser.fz-juelich.de/record/904472},
}