| 地面冻结数模型及其在青藏高原的应用 |
| |
| 引用本文： | 南卓铜,李述训,程国栋,黄培培.地面冻结数模型及其在青藏高原的应用[J].冰川冻土,2012,34(1):89-95. |
| |
| 作者姓名： | 南卓铜 李述训 程国栋 黄培培 |
| |
| 作者单位： | 中国科学院寒区旱区环境与工程研究所,甘肃兰州730000／中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000;中国科学院寒区旱区环境与工程研究所,甘肃兰州,730000 |
| |
| 基金项目： | 科技基础性工作专项，国家重点实验室开放基金 |
| |
| 摘 要： | 地面冻结数模型可用于分析、模拟和预测多年冻土的分布,在高纬冻土地区有比较成功的应用.然而Nelson提出的地面冻结数模型并不具备明显的物理意义,往往被归入经验统计范畴.从Ste-fan公式出发,重新推导并详细讨论了地面冻结数模型,使冻结数F=0.5作为多年冻土与季节冻土的分界线具备明确的物理意义.重新推导后的模型增加了一个影响冻土形成和发展过程的并取决于岩土冻融性质的因子E,原Nelson地面冻结数模型可作为E=1时的特例给出.根据青藏高原实测地面温度资料,针对不同的E值,分别模拟了青藏高原的冻土分布情况.对比分析表明,处在多年冻土南北界附近的土壤性质较明显影响了多年冻土在这些区域的分布情况,通过对参数E的调参,可以更好地模拟多年冻土的真实分布情况.
|
| 关 键 词： | 地面冻结数模型 冻土分布 青藏高原 |
Surface Frost Number Model and Its Application to the Tibetan Plateau |
| |
| NAN Zhuo-tong,LI Shu-xun,CHENG Guo-dong,HUANG Pei-pei.Surface Frost Number Model and Its Application to the Tibetan Plateau[J].Journal of Glaciology and Geocryology,2012,34(1):89-95. |
| |
| Authors: | NAN Zhuo-tong LI Shu-xun CHENG Guo-dong HUANG Pei-pei |
| |
| Institution: | 1(1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000, China;2.State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China) |
| |
| Abstract: | The surface frost number model,a statistical-empirical method,is able to simulate and predict frozen soil distribution,which has been applied successfully in high latitude regions.However,owing to lack of physical meaning,it should be carefully treated for applying in other regions.For example,it is unclear whether or not a threshold F=0.5 is sufficient to delineate frozen soil distribution in high altitude regions such as the Tibetan Plateau.In this paper,the surface frost number model is re-derived from an explicit physical formulation,the classical Stephan’s solution.A new variable E is introduced to explicitly reflect the thermal effects of frozen and thawed states.The original Nelson’s surface frost number model can be implemented as a specific instance of E=1.A set of simulations on the Tibetan Plateau with different E were carried out using observed surface soil temperature data.It is found that this model can depict major characteristics of frozen soil distribution over the plateau.A comparative analysis shows that E,representing soil type,has obvious impact on frozen soil distribution,in particular in the northern and southern permafrost boundaries of the plateau.It could be expected that a better simulation can be obtained using a calibrated parameter E. |
| |
| Keywords: | surface frost number model frozen soil distribution Tibetan Plateau |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
