摘要
通过对温度波在地层内传播过程问题的分析研究 ,讨论土在冻结和融化过程对地气系统能量交换的影响 ,并以亚粘土为例应用近似方法计算了在冻结和融化过程地气系统能量交换和地温变化特征 ,同时将相同条件下发生冻融作用与不发生冻融作用情况地气系统热交换量进行了比较 .结果表明 ,冻融作用使地气系统热交换加强 ,同时吸热和放热的过程也发生了改变 .
The change characteristics of the heat exchange between atmosphere and ground surface during the temperature wave propagation downwards, the consuming heat during soil freezing or thawing, the change characteristics of the ground temperature observed in different types of freezing ground, the impact of soil freezing and thawing process on heat exchange between atmosphere and ground surface, and the ground temperature are discussed. According to computation and observation, the following conclusions can be drawn. \;1) The soil freezing and thawing process greatly increases the heat exchange between atmosphere and ground surface. The propagation speed of ground temperature attenuates with depth and increasing pressure when phase change is absent. \;2) During soil thawing the heat exchange is 3 times more than that without phase change. During soil freezing the heat exchange is 3\^5 times more than that without phase change. \;3) In seasonally frozen ground regions annual mean ground temperature is mainly dependent on summer ground surface temperature, and in seasonally frozen ground regions annual mean ground temperature is mainly dependent on winter ground surface temperature.
出处
《冰川冻土》
CSCD
北大核心
2002年第5期506-511,共6页
Journal of Glaciology and Geocryology
基金
国家基础研究发展规划项目 (G19980 40 80 3 )
中国科学院寒区旱区环境与工程研究所知识创新工程项目 (CACX2 0 0 0 0 9)资助
