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冰川冻土  2013 

黄河源区多年冻土热传导系数影响因素分析及其在活动层厚度模拟中的应用

DOI: 10.7522/j.issn.1000-0240.2013.0093, PP. 824-833

Keywords: 热传导系数,多年冻土,数值模拟,黄河

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Abstract:

多年冻土区融化层的热传导系数的大小决定了全球气候变化条件下,多年冻土的响应强弱以及对周围环境的影响.在野外实测与实验室分析的基础上,研究了黄河源区3种典型岩土的干容重、含水率和温度对导热系数的影响,通过建立起回归方程,运用Stephen公式近似计算了2002年源区最大冻结和融化深度的分布.结果表明黄河源区三种典型岩土的导热系数从小到大依次为腐殖土、碎石亚黏土、细沙;干容重和含水率与导热系数具有较好的正相关关系,是影响导热系数的主要因素,在较小的温度变化范围内,温度对导热系数的影响不明显.基于实测的导热系数分布模拟得到的最大融化深度在地势较低的黄河干流及

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