A complete soil hydraulic model accounting for capillary and adsorptive water retention, capillary and film conductivity, and hysteresis
A complete soil hydraulic model accounting for capillary and adsorptive water retention, capillary and film conductivity, and hysteresis
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DOI：
10.1002/2015wr017703
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发表时间：
2015-11
影响因子：
5.4
通讯作者：
Rudiyanto;M. Sakai;M. V. van Genuchten;A. A. Alazba-A.;B. Setiawan;B. Minasny
中科院分区：
文献类型：
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作者：
Rudiyanto;M. Sakai;M. V. van Genuchten;A. A. Alazba-A.;B. Setiawan;B. Minasny
提出了一个覆盖整个土壤水分范围的土壤水力模型，该模型考虑了毛管滞回和吸附持水以及毛管和膜的传导性。该模型是通过将Parker和Lenhard的毛细滞后模型与Peter-Durner-Iden(PDI)水力模型相结合得到的，该模型是为van Genuchten(VG)保留方程建立的。该配方包括以下过程：考虑空气滞留的毛细滞后、闭合扫描曲线、矿物表面保水性的非滞后吸附、毛细电导率的滞后函数、薄膜电导率的非滞后函数、以及整个含水率范围内的电导率作为含水率的函数(θ)的近乎非滞后的函数。所提出的模型只需要两个额外的参数来描述磁滞。该模型能较好地描述沙丘沙地的滞回持水量和电导率数据。使用一系列已公布的数据集，可以在毛细管水保持率和膜电导率参数之间建立关系。包括蒸气传导性，改进了在非常干燥的范围内的传导性描述。由此得到的模型允许使用水分保持参数来预测从饱和到完全干燥的水力传导性。
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.