侧向导热流对地面温度的影响以及对永久土建模的影响
Yu Zhang1, Gang Hong2, Mitchell T Bonney2
1Canada Centre for Remote Sensing, Canada Centre for Mapping and Earth Observation, Natural Resources Canada, 580 Booth Street, Ottawa, ON, K1A 0E4, Canada. yu.zhang@nrcan-rncan.gc.ca.
侧向热流显著影响永久土的地面温度,特别是在更深层的土壤层. 在一维永久土模型中忽视这些效应可能会导致大量错误,这对于准确的地面温度建模至关重要.
科学领域:
- 地质物理学 地质物理学
- 永久土科学 永久土科学
背景情况:
- 永久土的地面温度通常使用1D垂直热流来建模.
- 在标准永久土模型中,侧面热流效应经常被忽视.
研究的目的:
- 从理论上评估横向导热流对永久土地面温度的影响.
- 评估横向热流在解释观察到的地面温度变化的重要性.
主要方法:
- 在平衡和过渡条件下,理论计算侧向热流影响.
- 来自加拿大东北部191个钻井的地面温度数据的分析.
- 横向延伸和深度的估计受侧面热流的影响.
主要成果:
- 侧向热流强烈影响地面温度,特别是在深层永久土中.
- 在钻井中观察到的地面温度模式是由侧向热流效应解释的.
- 一维模型可能会在小网格单元中引入高达5°C的误差.
结论:
- 侧向热流是永久土地区普遍存在的重要因素.
- 准确的永久土建模需要结合横向热传输.
- 结果指导永久土建模,绘图和现场观测地点的选择.
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