Asghar Ghorbani, Morteza Sadeghi, Markus Tuller, Wolfgang Durner, Scott B. Jones
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引用次数: 0
摘要
可变饱和土壤或一般多孔介质的流体力学是通过保水性和导水率的非线性函数来描述的，这有助于模拟多孔介质中的各种质量和能量传输过程（如水、热、污染物、胶体）。我们着手推导改进的函数，以便更准确地估算土壤水力函数，从而推动多孔介质流体力学的模拟。我们提出了一个新模型，用于根据土壤水分滞留（SWR）函数估算非饱和水力传导率（UHC），该函数通过对测量数据的非线性回归进行参数化。该函数可视为广义的 van Genuchten（1980 年）模型（GVG）。我们对文献中的大量数据集测试了新的 SWR 和 UHC 表达式，这些数据集涵盖了广泛的土壤质地。比较结果表明，使用 GVG 模型与原始范-格努赫腾模型相比，估算结果更为准确。
A generalized van Genuchten model for unsaturated soil hydraulic conductivity
The hydrodynamics of variably saturated soils or porous media in general are described via nonlinear functions of water retention and hydraulic conductivity, which facilitate the simulation of various mass and energy transport processes (e.g., water, heat, contaminants, colloids) within the porous medium. We set out to derive improved functions for more accurate estimations of soil hydraulic functions to advance the simulation of porous medium hydrodynamics. A new model is proposed for estimating the unsaturated hydraulic conductivity (UHC) from a soil water retention (SWR) function that is parameterized via nonlinear regression of measured data. The function can be viewed as a generalized van Genuchten (1980) model (GVG). We tested the new SWR and UHC expressions for numerous data sets from literature that cover a wide range of soil textures. Our comparisons reveal more accurate estimations using the GVG model by comparison with the original van Genuchten model.
期刊介绍：
Vadose Zone Journal is a unique publication outlet for interdisciplinary research and assessment of the vadose zone, the portion of the Critical Zone that comprises the Earth’s critical living surface down to groundwater. It is a peer-reviewed, international journal publishing reviews, original research, and special sections across a wide range of disciplines. Vadose Zone Journal reports fundamental and applied research from disciplinary and multidisciplinary investigations, including assessment and policy analyses, of the mostly unsaturated zone between the soil surface and the groundwater table. The goal is to disseminate information to facilitate science-based decision-making and sustainable management of the vadose zone. Examples of topic areas suitable for VZJ are variably saturated fluid flow, heat and solute transport in granular and fractured media, flow processes in the capillary fringe at or near the water table, water table management, regional and global climate change impacts on the vadose zone, carbon sequestration, design and performance of waste disposal facilities, long-term stewardship of contaminated sites in the vadose zone, biogeochemical transformation processes, microbial processes in shallow and deep formations, bioremediation, and the fate and transport of radionuclides, inorganic and organic chemicals, colloids, viruses, and microorganisms. Articles in VZJ also address yet-to-be-resolved issues, such as how to quantify heterogeneity of subsurface processes and properties, and how to couple physical, chemical, and biological processes across a range of spatial scales from the molecular to the global.
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