| 青藏高原典型多年冻土区的一维水热过程模拟研究 |
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| 引用本文： | 马启民,黄滢冰,南卓铜,吴小波.青藏高原典型多年冻土区的一维水热过程模拟研究[J].冰川冻土,2016(2):341-350. |
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| 作者姓名： | 马启民 黄滢冰 南卓铜 吴小波 |
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| 作者单位： | 1. 西北师范大学地理与环境科学学院,甘肃兰州,730070;2. 东莞市地理信息与规划编制研究中心,广东东莞,523129;3. 南京师范大学地理科学学院,江苏南京,210023;4. 中国科学院寒区旱区环境与工程研究所,甘肃兰州,730000 |
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| 基金项目： | 国家自然科学基金项目(41471059) |
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| 摘 要： | 了解多年冻土内部的水热过程对寒区工程规划和建设的辅助决策具有重要意义.冻土的水分迁移与温度变化密切相关,然而传统的经验模型局限性大,对水热物理过程考虑不足;陆面过程模型所需的驱动数据多且很难准确模拟深层土温,尽管数值模型在工程上应用的比较多,但很少应用到冻土的演化过程中.基于非饱和土壤渗流和热传导理论,实现了冻土水分场与温度场的水热耦合数值模拟.以唐古拉综合观测场为例,将数值模拟结果与观测数据进行对比,验证水热耦合数值模拟的有效性.结果表明:模型对土壤温度模拟效果较好,15 m以上R~2在0.88以上,RMSE在1℃以内;水分模拟尚可,但仍存在一定误差,R~2在0.7以上,RMSE在7.65%以内.模拟的活动层厚度约3.6 m,年平均地温所在的深度约为15 m,与实测值基本一致.该水热耦合模型可用于研究多年冻土区土壤水热变化规律.
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| 关 键 词： | 冻土 数值模型 土壤温度 土壤水分 水热耦合 |
Simulating one dimensional water-heat processes in a typical permafrost region in the Tibetan Plateau |
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| MA Qimin,HUANG Yingbing,NAN Zhuotong,WU Xiaobo.Simulating one dimensional water-heat processes in a typical permafrost region in the Tibetan Plateau[J].Journal of Glaciology and Geocryology,2016(2):341-350. |
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| Authors: | MA Qimin HUANG Yingbing NAN Zhuotong WU Xiaobo |
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| Abstract: | Understanding of water and heat processes of permafrost is crucial for engineering planning and con-struction in the cold regions. Moisture migration in the frozen soil is closely related to temperature changes. How-ever,traditional empirical models take insufficient account of water-heat physics. Land surface models need a lot of driving data and are difficult to accurately simulate deep soil temperature. Numerical models have been widely applied to engineering in cold regions but rarely to the evolution of the permafrost. This study developed a numer-ical simulation model coupling the soil moisture and temperature field of permafrost,based on the water flow theory of unsaturated soil and the heat transfer theory. To verify the model,a case study was carried out at the Tanggula site where complete permafrost observations are available. The result shows that the model performs well in soil temperature simulation,15 m within an R2 above 0. 88 and an RMSE less than 1℃. The performance of soil moisture simulation is acceptable,with an R2 above 0. 7 and an RMSE less than 7. 65%. The estimated ac-tive layer thickness is about 3. 6 m,and the depth of zero amplitude of soil temperature is approximately 15m and consistent with the measured depth. The developed model is concluded to be applicable to study the changes of soil water flow and heat transport in permafrost underlain areas. |
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| Keywords: | frozen soil numerical model soil temperature soil moisture coupled water flow and heat trans-port |
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