Improved calibration of the Green–Ampt infiltration module in the EROSION-2D/3D model using a rainfall-runoff experiment database
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027031%3A_____%2F21%3AN0000118" target="_blank" >RIV/00027031:_____/21:N0000118 - isvavai.cz</a>
Alternative codes found
RIV/00027049:_____/21:N0000036
Result on the web
<a href="https://doi.org/10.5194/soil-7-241-2021" target="_blank" >https://doi.org/10.5194/soil-7-241-2021</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5194/soil-7-241-2021" target="_blank" >10.5194/soil-7-241-2021</a>
Alternative languages
Result language
angličtina
Original language name
Improved calibration of the Green–Ampt infiltration module in the EROSION-2D/3D model using a rainfall-runoff experiment database
Original language description
Soil infiltration is one of the key factors that has an influence on soil erosion caused by rainfall. Therefore, a well-represented infiltration process is a necessary precondition for successful soil erosion modelling. Complex natural conditions do not allow the full mathematical description of the infiltration process, and additional calibration parameters are required. The Green-Ampt-based infiltration module in the EROSION-2D/3D model introduces a calibration parameter "skinfactor"to adjust saturated hydraulic conductivity. Previous studies provide skinfactor values for several combinations of soil and vegetation conditions. However, their accuracies are questionable, and estimating the skinfactors for other than the measured conditions yields significant uncertainties in the model results. This study brings together an extensive database of rainfall simulation experiments, the state-of-the-art model parametrisation method and linear mixed-effect models to statistically analyse relationships between soil and vegetation conditions and the model calibration parameter skinfactor. New empirically based transfer functions for skinfactor estimation significantly improving the accuracy of the infiltration module and thus the overall EROSION-2D/3D model performance are provided in this study. Soil moisture and bulk density were identified as the most significant predictors explaining 82 % of the skinfactor variability, followed by the soil texture, vegetation cover and impact of previous rainfall events. The median absolute percentage error of the skinfactor prediction was improved from 71 % using the currently available method to 30 %-34 % using the presented transfer functions, which led to significant decrease in error propagation into the model results compared to the present method. The strong logarithmic relationship observed between the calibration parameter and soil moisture however indicates high overestimation of infiltration for dry soils by the algorithms implemented in EROSION-2D/3D and puts the state-of-the-art parametrisation method in question. An alternative parameter optimisation method including calibration of two Green-Ampt parameters' saturated hydraulic conductivity and water potential at the wetting front was tested and compared with the state-of-the-art method, which paves a new direction for future EROSION-2D/3D model parametrisation.
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
40104 - Soil science
Result continuities
Project
<a href="/en/project/QK1810341" target="_blank" >QK1810341: Creating a national database of parameters for the mathematical simulation model EROSION-3D and its standardization for routine use in the Czech Republic.</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Soil
ISSN
2199-3971
e-ISSN
2199-398X
Volume of the periodical
1
Issue of the periodical within the volume
7
Country of publishing house
DE - GERMANY
Number of pages
12
Pages from-to
241-253
UT code for WoS article
000664287800001
EID of the result in the Scopus database
2-s2.0-85108269146