A Hysteretic Model of Hydraulic Properties for Dual-Porosity Soils
A Hysteretic Model of Hydraulic Properties for Dual-Porosity Soils
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DOI：
10.2136/sssaj2012.0339n
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发表时间：
2013-07
影响因子：
2.9
通讯作者：
Rudiyanto;N. Toride;M. Sakai;J. Šimůnek
中科院分区：
文献类型：
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作者：
Rudiyanto;N. Toride;M. Sakai;J. Šimůnek
在双峰van Genuchten模型和Kool&Parker(K&P)滞回模型的基础上，提出了双孔隙土水力特性的滞回模型。滞回只在第一个孔隙区被考虑，主要影响较高的含水率，而在第二个孔隙区假定为非滞后行为，主要影响较低的含水率。除α₁外，主要的干燥和润湿曲线用相同的参数描述，而干燥和润湿曲线则不同。用K&P模型描述了第一分区的扫描磁滞回线。滞回保水率模型与安迪生土干湿保留率曲线和扫描回线符合得很好。尽管用Mualem孔隙分布模型计算的相应的非饱和导水率K(θ)在较高含水率时是非滞后的，但在较低含水率时K(θ)出现了不切实际的滞后。为了获得整个含水率范围内的“几乎”非滞后的K(θ)函数，对K(α₁)的θ参数的值施加了额外的限制，并且对干燥和润湿曲线都使用了一个值。
We propose a hysteretic model of hydraulic properties for dual-porosity soils based on the bimodal van Genuchten model and Kool and Parker (K&P) hysteresis model. Hysteresis is considered only in the first pore domain, affecting mainly higher water contents, while a nonhysteretic behavior is assumed in the second pore domain, affecting mainly lower water contents. The main drying and wetting curves are described with the same set of parameters except for α₁, which is different for the drying and wetting curves. The scanning hysteresis loops in the first subregion are also described using the K&P model. The hysteretic water retention model agrees reasonably well with drying and wetting retention curves and scanning loops observed for Andisols. Although the corresponding unsaturated hydraulic conductivity, evaluated using the Mualem pore-size distribution model, as a function of the water content, K(θ), is nonhysteretic for higher water contents, unrealistic hysteresis occurs in K(θ) for lower water contents. To obtain an “almost” nonhysteretic K(θ) function for the entire range of water contents, an additional constraint on the value of the α₁ parameter for K(θ) is imposed, and a single value is used for both drying and wetting curves.