Comparison of Three Regression Models for Determining Water Retention Curves

Skalová, Jana; Čistý, Milan; Bezak, Juraj

doi:10.2478/v10098-011-0023-7

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…Twarakavi et al () developed SVM‐based PTFs using the data set of Rosetta (Schaap et al, ) and found SVMs outperforming ANN‐based PTFs. More recent applications include Skalová et al (), Haghverdi et al (), Nguyen et al (), and Khlosi et al ().…”

Section: Methods To Derive and Evaluate Pedotransfer Functionsmentioning

confidence: 99%

Pedotransfer Functions in Earth System Science: Challenges and Perspectives

Looy

Bouma

Herbst

et al. 2017

Reviews of Geophysics

411

297

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Soil, through its various functions, plays a vital role in the Earth's ecosystems and provides multiple ecosystem services to humanity. Pedotransfer functions (PTFs) are simple to complex knowledge rules that relate available soil information to soil properties and variables that are needed to parameterize soil processes. In this paper, we review the existing PTFs and document the new generation of PTFs developed in the different disciplines of Earth system science. To meet the methodological challenges for a successful application in Earth system modeling, we emphasize that PTF development has to go hand in hand with suitable extrapolation and upscaling techniques such that the PTFs correctly represent the spatial heterogeneity of soils. PTFs should encompass the variability of the estimated soil property or process, in such a way that the estimation of parameters allows for validation and can also confidently provide for extrapolation and upscaling purposes capturing the spatial variation in soils. Most actively pursued recent developments are related to parameterizations of solute transport, heat exchange, soil respiration, and organic carbon content, root density, and vegetation water uptake. Further challenges are to be addressed in parameterization of soil erosivity and land use change impacts at multiple scales. We argue that a comprehensive set of PTFs can be applied throughout a wide range of disciplines of Earth system science, with emphasis on land surface models. Novel sensing techniques provide a true breakthrough for this, yet further improvements are necessary for methods to deal with uncertainty and to validate applications at global scale.

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Section: Methods To Derive and Evaluate Pedotransfer Functionsmentioning

confidence: 99%

Pedotransfer Functions in Earth System Science: Challenges and Perspectives

Looy

Bouma

Herbst

et al. 2017

Reviews of Geophysics

411

297

View full text Add to dashboard Cite

show abstract

“…15 compared the applicability of SWRCs using three major soil samples with different soil textures and from different geographical locations within Iran, indicating that the applicability of SWRCs varied owing to different soil texture. Therefore, model selection and comparison are prerequisite before the most suitable one can be determined for SWRCs of specific soils, and suchlike comparisons have been conducted 11,17,18 .…”

Section: Introductionmentioning

confidence: 99%

Comparison of three models fitting the soil water retention curves in a degraded alpine meadow region

Pan

Hou

Liu

et al. 2019

Sci Rep

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Soil water retention curve (SWRC) plays an important role in simulating soil water movement and assessing soil water holding capacity and availability. Comparison of fitness between different models to determine the best SWRC model of specific regions is required. In this study, three popular models, van Genuchten, Brooks Corey and Gardner model, were selected for comparing in a degraded alpine meadow region on the eastern Tibetan Plateau. Fitness, error distribution along with key parameters were compared. For each soil horizon, the soil moisture content at all soil water potentials decreased consistently with degradation, thereby integrally moving the SWRCs of all soil depths downward with degradation. The differences in SWRCs across various degradation degrees diminished along with soil depth and soil water potential. The Adj.r2 values of van Genuchten, Brooks Corey and Gardner models ranged in 0.971–0.995, 0.958–0.997, and 0.688–0.909, respectively. The van Genuchten and Brooks Corey models significantly (p < 0.05) outperformed the Gardner model, and have no significant differences in fitness. The fitness of all three models showed no significant changes with degradation. Regardless of degradation degree and soil depth, the fitting error of van Genuchten and Brooks Corey models was mainly distributed in the higher (from –100 hPa to –500 hPa) and lower (below –10000 hPa) potential sections. With regard to the parameters of van Genuchten and Brooks Corey models, the field capacity (θs), and permanent wilting moisture were highly coherent with Adj.r2 values of higher than 0.98, while the curve shape parameter (θr), and air entry pressure of the Brooks Corey model were much lower than those of the van Genuchten model with Adj.r2 values of lower than 0.91. The SWRCs with varying degrees of degradation are best fitted by both van Genuchten and Brooks Corey models but cannot be fitted by Gardner model. Soil water holding capacity decreased with degradation especially in the top soil (0 cm to 30 cm), but the curve shape of all SWRCs did not change significantly with degradation.

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“…Studies on pedotransfer functions have been carried out by many authors (e.g. Trzecki 1974Trzecki , 1976Varallyay and Mironienko 1979, Van Genuchten 1980, Rawls and Brakensiek 1982, Varallyay et al 1982, Walczak 1984, Carsel and Parrish 1988, Wösten et al 1999, Vereecken et al 1989Schaap et al 2001, Pachepsky and Rawls 2004, Walczak et al 2004, Dexter et al 2008, Gnatowski et al 2006Guber and Pachepsky 2010, Skalova et al 2011, Puhlmann and von Wilpert 2012, Hewelke et al 2013Brogowski and Kwasowski 2015, Lamorski et al 2017, Oleszczuk et al 2018. Among the developed models, we can distinguish continuous functions, enabling the moisture content of soil (θ) to be calculated for any given matrix potential (h), as well as discontinuous functions, making it possible to indicate the θ(h) relationships for characteristic θ values.…”

Section: Introductionmentioning

confidence: 99%

The application of pedotransfer functions in the estimation of water retention in alluvial soils in Żuławy Wiślane, northern Poland

Hewelke¹,

Hewelke²,

Oleszczuk³

et al. 2018

Soil Science Annual

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The aim of the studies was the assessment of the usefulness of selected pedotransfer function for calculating the water retention of alluvial soils in Żuławy Wiślane. Żuławy Wiślane are an important area, both as far as agricultural production and environmental values are concerned. The analysis accounted for three models, i.e.: van Genuchten-Wösten, Varellyay and Mieronienko, Hewelke et al. Based on 122 dataset of alluvial soils from the Żuławy area, the statistical relationships between the measured values of total available water and values calculated for individual models were analysed. The studies carried out indicate that the analysed pedotransfer functions are characterized by different compatibilities with results obtained by means of direct measurement. The lowest average errors of fit were obtained for the Hewelke et al. and van Genuchten models.

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Comparison of Three Regression Models for Determining Water Retention Curves

Cited by 14 publications

References 17 publications

Pedotransfer Functions in Earth System Science: Challenges and Perspectives

Pedotransfer Functions in Earth System Science: Challenges and Perspectives

Comparison of three models fitting the soil water retention curves in a degraded alpine meadow region

The application of pedotransfer functions in the estimation of water retention in alluvial soils in Żuławy Wiślane, northern Poland

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