BetaBetaDataset
To estimate soil water retention and hydraulic conductivity.
Related publications: Minasny, B., & Field, D. J. (2005). Estimating soil hydraulic properties and their uncertainty: The use of stochastic simulation in the inverse modelling of the evaporation method. Geoderma, 126(3–4), 277–290. Mualem, Y. (1976). A catalogue of the hydraulic properties of unsaturated soils. Nemes, A., Schaap, M. G., Leij, F. J., & Wösten, J. H. M. (2001). Description of the unsaturated soil hydraulic database UNSODA version 2.0. Journal of Hydrology, 251(3), 151–162. https://doi.org/https://doi.org/10.1016/S0022-1694(01)00465-6 Pachepsky, Y. A., Shcherbakov, R. A., Varallyay, G., Rajkai, K., Pachepsky, Y., Scherbakov, R., et al. (1984). On obtaining soil hydraulic conductivity curves from water retention curves (in Russian). Pochvovedenie, 10, 60–72. Peters, A. (2013). Simple consistent models for water retention and hydraulic conductivity in the complete moisture range. Water Resources Research, 49(10), 6765–6780. Rudiyanto, Sakai, M., van Genuchten, M. T., Alazba, A. A., Setiawan, B. I., & Minasny, B. (2015). A complete soil hydraulic model accounting for capillary and adsorptive water retention, capillary and film conductivity, and hysteresis. Water Resources Research, 51(11), 8757–8772. https://doi.org/10.1002/2015WR017703
Data entails the soil water retention profile and hydraulic conductivity. Datasets are given in compressed RAR format, decompressing to CSVs for each soil type and location.
A soil hydraulic model that considers capillary hysteretic and adsorptive water retention as well as capillary and film conductivity covering the complete soil moisture range is presented. The model was obtained by incorporating the capillary hysteresis model of Parker and Lenhard into the hydraulic model of Peters-Durner-Iden (PDI) as formulated for the van Genuchten (VG) retention equation. The formulation includes the following processes: capillary hysteresis accounting for air entrapment, closed scanning curves, nonhysteretic sorption of water retention onto mineral surfaces, a hysteretic function for the capillary conductivity, a nonhysteretic function for the film conductivity, and a nearly nonhysteretic function of the conductivity as a function of water content (θ) for the entire range of water contents. The proposed model only requires two additional parameters to describe hysteresis. The model was found to accurately describe observed hysteretic water retention and conductivity data for a dune sand. Using a range of published data sets, relationships could be established between the capillary water retention and film conductivity parameters. Including vapor conductivity improved conductivity descriptions in the very dry range. The resulting model allows predictions of the hydraulic conductivity from saturation until complete dryness using water retention parameters.