Analyses and development of a hierarchy of frozen soil models for cold region study
Analyses and development of a hierarchy of frozen soil models for cold region study
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寒地研究冻土层次模型的分析与发展
DOI：
10.1029/2009jd012530
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发表时间：
2010-02
影响因子：
--
通讯作者：
Xue, Yongkang
中科院分区：
文献类型：
--
作者：
Li, Qian;Sun, Shufen;Xue, Yongkang
目前使用的许多冻土模型在其控制方程的复杂性或/和所考虑的过程中有所不同。重要的是要根据物理原理、假设和相互关系对这些进行全面的检查和分类。本文根据控制方程的复杂程度将冻土模型分为不同的层次。在尺度分析的基础上，从最复杂的冻土模型出发，推导出不同复杂程度的模型。讨论了模型在不同层次上的简化方法。为了克服数值求解中的困难，在冻土模型的各层控制方程中引入了用土壤焓和总水质量代替土壤温度和液态水体积含量的新方法。用观测数据对不同复杂程度的模型进行了评估。初步的月和季评估结果表明，在西藏D 66站融冻期，不同复杂度的模式结果基本相似，但差异较大。考虑了基质势梯度对水汽通量贡献的模型在D 66站表现最好。与相应的原始模型相比，冻土模型版本的焓和总水质量的控制方程似乎产生一致的更好的性能。此外，不同的方法在冻土冻融过程中的基本原理进行了讨论。由凝固点下降方程和土壤基质势方程建立的模型得到了热力学平衡理论和模拟结果的支持。
Numerous frozen soil models currently in use differ in the complexity of their governing equations or/and in the processes being considered. It is important to comprehensively examine and categorize these on the basis of physical principles, assumptions, and relationship to each other. In this paper frozen soil models are classified into different levels according to the complexity of the governing equations. On the basis of scale analysis, models with different levels of complexity were derived from the most complicated frozen soil model. Rationales for the simplification of models at different levels are discussed. To overcome the difficulties in achieving numerical solutions, a new method of substituting soil enthalpy and total water mass for soil temperature and volumetric liquid water content in governing equations is introduced for each level of the frozen soil models. Models with different complexity levels are assessed with observational data. The preliminary monthly and seasonal evaluation shows that the results from the models with different complexity are generally similar but with substantial differences at the Tibetan D66 site during the melting and freezing period. The model including the contribution of vapor flux due to the matric potential gradient to the water balance performs the best at the D66 site. Compared to the corresponding original models, the frozen soil model versions with enthalpy and total water mass for governing equations appear to produce consistently better performance. Furthermore, the rationale of different methods for the freezing‐melting process in frozen soil is discussed. It has been noted that the model derived from the freezing point depression equation and the soil matric potential equation is supported by both thermodynamic equilibrium theory and the simulation results.
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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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DOI：
10.3133/pp678
发表时间：
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期刊：
--
影响因子：
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