| 一种新的土壤冻融特征曲线模型 |
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| 引用本文： | 付子腾,吴青柏,Miles DYCK,何海龙.一种新的土壤冻融特征曲线模型[J].冰川冻土,2021,43(2):437-452. |
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| 作者姓名： | 付子腾 吴青柏 Miles DYCK 何海龙 |
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| 作者单位： | 西北农林科技大学资源环境学院,陕西杨凌712100;中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;Department of Renewable Resources,University of Alberta,AB,T6G 2H1,Canada;西北农林科技大学资源环境学院,陕西杨凌712100 |
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| 基金项目： | 国家自然科学基金项目(41877015);陕西省自然科学基金项目（2020JM‐169）;冻土工程国家重点实验室开放基金项目(SKLFSE201905);中国博士后科学基金项目(2018M641024) |
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| 摘 要： | 土壤冻融特征曲线（SFTC）可以描述冻融过程中未冻水含量随负温的变化关系。准确刻画土壤冻融特征曲线对土壤的冻融过程及相关的水热耦合运移研究至关重要。以往研究中土壤冻融特征曲线适用范围较窄，无法满足实际需要。通过类比水分特征曲线，考虑初始含水量和溶质浓度对未冻水含量的影响，提出了一种新的冻融特征曲线模型，经广泛的文献数据验证表明，新模型能准确拟合观测数据，平均纳什效率系数高于0.95。与另外五种土壤冻融特征曲线模型相比，新模型在不同质地、初始含水量、溶质含量的土壤中表现良好。此外，敏感性分析显示，影响模型性能的主要因素为土壤自身物理特性、土壤溶质浓度以及残余水含量。新模型及研究结果有助于更好地理解土壤冻融过程中的水热传输过程，可为气候变化条件下冻融区生产建设和环境研究奠定坚实的理论基础，并为寒区工程相关数值模拟提供参考。
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| 关 键 词： | 土壤冻融特征曲线 未冻水含量 初始含水量 溶质浓度 模型 |
| 收稿时间： | 2019-08-02 |
| 修稿时间： | 2020-06-22 |
A new model to describe soil freezing-thawing characteristic curve |
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| FU Ziteng,WU Qingbai,Miles DYCK,HE Hailong.A new model to describe soil freezing-thawing characteristic curve[J].Journal of Glaciology and Geocryology,2021,43(2):437-452. |
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| Authors: | FU Ziteng WU Qingbai Miles DYCK HE Hailong |
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| Institution: | 1.College of Natural Resources and Environment，Northwest A & F University，Yangling 712100，Shaanxi，China;2.State Key Laboratory of Frozen Soil Engineering，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China;3.Department of Renewable Resources，University of Alberta，AB，T6G 2H1，Canada |
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| Abstract: | The hydrothermal change of frozen soil can be described by the soil freezing-thawing characteristic curve （SFTC）， which is the relationship between the unfrozen water content and the subfreezing temperature. A clear understanding of SFTC is crucial for studying the freezing process and coupled water-heat migration in frozen soil. In previous studies， the application scope of SFCT model is narrow， which can not correspond to practical needs. This study considered the influence of initial water contents and solute concentrations on unfrozen water content， proposed a new mathematical model for estimating SFTC. The Nash efficiency coefficient is generally greater than 0.95 based on validating published datasets. The new model performs well in soils with different physical characteristics， such as initial water contents， solution concentrations and it can be better and more widely used compared with the selected five literatures available SFTC models. In addition， sensitivity analysis showed that the factors affecting the parameters of proposed model are related to soil properties such as soil solution and residual water content. The new model enables us to better understand the process of water and heat transfer in soil freezing-thawing process， and serves as a solid theoretical foundation for the engineering and environmental studies and associated numerical simulation in the cold regions under climate change. |
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| Keywords: | soil freezing-thawing characteristic curve unfrozen water content initial water content solute concentrations model |
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