Hydraulic properties of horticultural substrates

Schindler, Uwe; Eulenstein, Frank

doi:10.18174/odjar.v3i1.15765

Cited by 1 publication

(1 citation statement)

References 4 publications

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“…To test the FM in its ability to describe measured retention and conductivity data, we compiled two sets of data. A first data set containing measurements of 53 samples was obtained from the literature covering mineral soils with a wide range of textures and origins (Mualem, 1976b, data obtained from the SI of Rudiyanto et al, 2015; Schindler & Müller, 2010; organic soils, Schindler & Müller, 2015; horticultural substrates, Schindler, 2016, and from the widely used UNSODA, Nemes et al, 2001) and “Vereecken” (Vereecken et al, 1989) databases. Measured data were obtained employing a wide range of measurement techniques.…”

Section: Model Testingmentioning

confidence: 99%

A Modular Framework for Modeling Unsaturated Soil Hydraulic Properties Over the Full Moisture Range

Weber

Durner

Streck

et al. 2019

Water Resources Research

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A generalized modular framework for partitioning soil hydraulic property (SHP) functions into a capillary and a noncapillary part is developed. The full water retention curve (WRC) is modeled as a weighted sum of a parametric capillary saturation function and a new general model for the noncapillary saturation function. This model is directly computed from any selected capillary saturation function. With it, a physically complete, continuous, and flexible representation of the WRC is achieved, ensuring zero water content at oven dryness. In a modular and hierarchical framework, the expressions for the capillary and noncapillary saturation function are used to calculate the respective hydraulic conductivity curves (HCC). This is achieved by adopting Mualem's integral for the capillary part of the HCC only and calculating the noncapillary HCC directly from the new noncapillary saturation function. This leads to consistent descriptions of measured HCC data, including the often observed change in slope beyond −100 cm pressure head. Compared to the classical van Genuchten-Mualem approach, it requires only one additional model parameter. The SHP framework model describes both WRC and HCC adequately and coherently. We demonstrate the suitability of the SHP framework and versatility by describing measured WRC and HCC data across the full moisture range using soil samples from a wide range of textures and origins. The modular framework was implemented in the soil physics and soil hydrology (spsh) R-package, available from the Comprehensive R Archive Network. It contains several SHP models, model parameter estimation, and features options for goodness of fit statistics, and model selection.

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