Anisotropy of soil water diffusivity of hillslope soil under spruce forest derived by X-ray CT and lab experiments
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F22%3A00359974" target="_blank" >RIV/68407700:21110/22:00359974 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s12665-022-10511-9" target="_blank" >https://doi.org/10.1007/s12665-022-10511-9</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s12665-022-10511-9" target="_blank" >10.1007/s12665-022-10511-9</a>
Alternative languages
Result language
angličtina
Original language name
Anisotropy of soil water diffusivity of hillslope soil under spruce forest derived by X-ray CT and lab experiments
Original language description
The idea of the study is to indicate direction-dependent differences in hydraulic conductivity, K(Se), and soil water diffusivity, D(θ), as function of the volume fraction related to the fractional capillary potential for each of the characteristic pore size classes by extended anisotropy factors. The study is exemplary focused on a BwC horizon of a Dystric Cambisol under spruce forest formed on the weathered and fractured granite bedrock in the mountainous hillslopes Uhlirska catchment (Czech Republic). Thus, undisturbed soil samples were taken in vertical (0°, y = x-axis) and horizontal (90°, z-axis) direction. The D(θ) values and especially the D(θ)-weighted anisotropy ratios showed that anisotropy increases with the volume fraction of macropores, MaP (d > 0.03 mm), with r2 between 0.89 and 0.92. The X-ray computer tomography (CT) based anisotropy ratio (ACT) is larger for the horizontal sampled soil core with 0.31 than for the vertical with 0.09. This underlines the existence of a predominantly horizontally oriented pore network and the fact that weathered bedrock strata can initiate lateral preferential flow. The study results suggest that combining the hydraulic conductivity as intensity and the capacity parameter by means of diffusivity results in an extended anisotropy ratio which unveils the role of the soil hydraulic characteristics in generation of small-scale lateral preferential flow. In future, the small-scale direction-dependent differences in the soil hydraulic capacity and intensity parameter will be used for model-based upscaling for better understanding of preferential flow at the catchment scale.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10501 - Hydrology
Result continuities
Project
<a href="/en/project/GA20-00788S" target="_blank" >GA20-00788S: Underrepresented processes affecting the water balance of forest catchments in headwater areas of temperate zone</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Environmental Earth Sciences
ISSN
1866-6280
e-ISSN
1866-6299
Volume of the periodical
81
Issue of the periodical within the volume
18
Country of publishing house
US - UNITED STATES
Number of pages
15
Pages from-to
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UT code for WoS article
000854836200001
EID of the result in the Scopus database
2-s2.0-85138312590