A Modular Framework for Modeling Unsaturated Soil Hydraulic Properties Over the Full Moisture Range
A Modular Framework for Modeling Unsaturated Soil Hydraulic Properties Over the Full Moisture Range
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用于模拟全湿度范围内非饱和土水力特性的模块化框架
DOI：
10.1029/2018wr024584
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发表时间：
2019
影响因子：
5.4
通讯作者：
E. Diamantopoulos
中科院分区：
文献类型：
--
作者：
Tobias K. D. Weber;W. Durner;T. Streck;E. Diamantopoulos
提出了一种将土壤水力特性函数划分为毛管和非毛管两部分的通用模块化框架。全水分保留曲线（WRC）被建模为一个加权和的参数毛细管饱和度函数和一个新的通用模型的非毛细管饱和度函数。该模型直接从任何选定的毛细管饱和度函数计算。有了它，就可以实现WRC的物理完整、连续和灵活的表现，确保烘箱干燥时的零含水量。在一个模块化和层次化的框架中，毛细管和非毛细管饱和度函数的表达式被用来计算各自的水力传导系数曲线（HCC）。这是通过采用Mualem积分的毛细管部分的HCC和计算的非毛细管HCC直接从新的非毛细管饱和度函数。这导致了对实测HCC数据的一致描述，包括经常观察到的超过-100 cm压头的斜率变化。与经典的货车van Schuchten-Mualem方法相比，该方法只需要增加一个模型参数。SHP框架模型充分且连贯地描述了WRC和HCC。我们证明了SHP框架的适用性和多功能性，通过描述测量的WRC和HCC数据在整个水分范围内使用土壤样品从广泛的纹理和起源。该模块化框架在土壤物理学和土壤水文学（spsh）R软件包中实现，可从Comprehensive R Archive Network获得。它包含几个SHP模型、模型参数估计、拟合优度统计特性选项和模型选择。
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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影响因子：
5.4
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
6.2
作者：
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通讯作者：
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