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黑河高山草甸冻土带水热传输过程

阳勇, 陈仁升, 吉喜斌, 卿文武, 刘俊峰, 韩春坛

阳勇, 陈仁升, 吉喜斌, 卿文武, 刘俊峰, 韩春坛. 黑河高山草甸冻土带水热传输过程[J]. 水科学进展, 2010, 21(1): 30-35.
引用本文: 阳勇, 陈仁升, 吉喜斌, 卿文武, 刘俊峰, 韩春坛. 黑河高山草甸冻土带水热传输过程[J]. 水科学进展, 2010, 21(1): 30-35.
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YANG Yong, CHEN Ren-sheng, JI Xi-bin, QING Wen-wu, LIU Jun-feng, HAN Chun-tan. Heat and water transfer processes on alpine meadow frozen grounds of Heihe mountainous in Northwest China[J]. Advances in Water Science, 2010, 21(1): 30-35.
Citation: YANG Yong, CHEN Ren-sheng, JI Xi-bin, QING Wen-wu, LIU Jun-feng, HAN Chun-tan. Heat and water transfer processes on alpine meadow frozen grounds of Heihe mountainous in Northwest China[J]. Advances in Water Science, 2010, 21(1): 30-35.
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黑河高山草甸冻土带水热传输过程

  • 1.

    中国科学院寒区旱区环境与工程研究所黑河上游生态-水文试验研究站, 甘肃, 兰州, 730000;

  • 2.

    中国科学院生态水文与流域科学重点实验室, 甘肃, 兰州, 730000

基金项目: 国家自然科学基金资助项目(40771045;90702001-2;40401012);中国科学院知识创新工程重要方向性项目(KZCX2-YW-301-3);国家重点基础研究发展计划(973)资助项目(2007CB411506)
详细信息
    作者简介:

    阳勇(1980- ),男,湖北荆州人,博士研究生,主要从事冻土水文过程研究.E-mail:yy177@lzb.ac.cn

  • 中图分类号: P339

Heat and water transfer processes on alpine meadow frozen grounds of Heihe mountainous in Northwest China

  • 1.

    Heihe Upstream Watershed Ecology-Hydrology Experimental Research Station, Cold and Arid Region Environment and Engineering Research Institute, CAS, Lanzhou 730000, China;

  • 2.

    Key Laboratory of Ecohydrology and Integrated River Basin Management, CAS, Lanzhou 730000, China

Funds: This study is financially supported by National Natural Science Foundation of China(No.40771045; No.90702001-2;No.40401012),the Knowledge Innovation Project of Chinese Academy of Sciences(No.KZCX2-YW-301-3) and the National Basic Research Program of China(No.2007CB411506).

摘要

    摘要
  • 摘要: 以黑河源区高山草甸冻土带的基本气象参数、植被参数和土壤水热性质参数为输入条件,利用CoupModel模型计算了试验点两个完整年度日尺度上的各种基本水热状况,计算结果较符合实测值(7层地温和土壤液态含水量平均R2分别为0.95和0.83).利用模型输出的土壤热通量和土壤水迁移分析了试验点季节性冻土区的水热传输过程:在土壤层开始冻结期,下层土壤液态水向冻结锋面集结,集结期向上的地热通量急剧增加;在冻结期,土壤热传导主要与上下层的土壤温度有关,土壤水迁移基本处于零通量状态;在融化期,在融化锋面未出现液态水分集结现象,融化层土壤水热传输过程迅速改变并与非冻结土壤一致,向下的地热通量急剧增加.
    Abstract: The hydrological process in frozen soil regions is very intensive to global warming.The coupled heat and mass transfer model for soil-plant-atmosphere system(Coup Model) is applied in the headwater region of the Heihe River,with an alpine meadow frozen ground landscape.The observed meteorological forcing and soil and vegetation properties are used in the Coup Model application for the period from September 10,2005 to September 10,2007.A 24-h time step is used in the model simulation.The results show that the simulated soil temperature and water content as well as frozen depth compare well with the observations.The coefficient of determination(R2) of 7 soil layers is 0.95 for the mean soil temperature,and 0.83 for the mean soil water content.An analysis is performed on the simulated heat and water transfer process from the deep soil layer to the upper one during the freezing seasons.At the beginning of the season,the water in the deep soil layer moves upward to the freezing front and releases heat during the freezing process.When the soil layer is frozen completely,there will be no vertical water exchanges between the soil layers,and the heat exchange process is controlled by the vertical soil temperature gradient.During the thawing period,the downward heat process becomes more active with the help of the increase of incoming shortwave radiation at the ground surface.There will be no confinement of the melt water in the thawing front.Instead,the melt water will be quickly dissolved in the soil.Eventually,the frozen soil heat and water transfer process vanishes and the unfrozen process returns.
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    • 参考文献(13)
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出版历程
  • 收稿日期:  2008-12-08
  • 刊出日期:  2010-01-24

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