摘要
多年冻土温度场在气候变化研究中具有重要意义,因为多年冻土具有记忆古温度场的能力。钻探过程对冻土原状温度具有深刻影响,深钻孔在几年内难以恢复到天然状态。热扩散理论表明,50年后钻孔温度才能恢复至平衡状态。控制钻孔温度恢复的对数方程为求得冻土平衡态温度场提供了有效手段。
Deep permafrost thermal regime has significant implications in climatic change studies because it preserves information on the history of near-surface temperatures.
The disturbance caused by drilling to permafrost thermal condition is so profound that even after several years of drilling deep boreholes can not return to their thermal equilibrium (undisturbed) state. Heat dissipation theory indicates that the time necessary for a borehole of several hundred metres deep to attain temperature equilibrium is approximately 50 years. The temperature return in a borehole is a remarkably good fit to the logarithmic relationship which provides an effective means of determining undisturbed (equilibrium) temperatures.
出处
《冰川冻土》
CSCD
北大核心
1993年第4期535-541,共7页
Journal of Glaciology and Geocryology
关键词
多年冻土
温度
钻孔
平衡态温度
permafrost, temperature return, borehole heat dissipation, equilibrium temperature
