| DOI: | 10.5194/tc-11-1311-2017
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| Scopus记录号: | 2-s2.0-85020277821
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| 论文题名: | Numerical modelling of convective heat transport by air flow in permafrost talus slopes |
| 作者: | Wicky J; , Hauck C
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2017
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| 卷: | 11, 期:3 | | 起始页码: | 1311
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| 结束页码: | 1325
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| 语种: | 英语
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| 英文关键词: | air temperature
; airflow
; climate change
; convection
; frozen ground
; ground conditions
; heat transfer
; hydrological regime
; numerical model
; permafrost
; pile
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| 英文摘要: | Talus slopes are a widespread geomorphic feature in the Alps. Due to their high porosity a gravity-driven internal air circulation can be established which is forced by the gradient between external (air) and internal (talus) temperature. The thermal regime is different from the surrounding environment, leading to the occurrence of permafrost below the typical permafrost zone. This phenomenon has mainly been analysed by field studies and only few explicit numerical modelling studies exist. Numerical simulations of permafrost sometimes use parameterisations for the effects of convection but mostly neglect the influence of convective heat transfer in air on the thermal regime. In contrast, in civil engineering many studies have been carried out to investigate the thermal behaviour of blocky layers and to improve their passive cooling effect. The present study further develops and applies these concepts to model heat transfer in air flows in a natural-scale talus slope. Modelling results show that convective heat transfer has the potential to develop a significant temperature difference between the lower and the upper parts of the talus slope. A seasonally alternating chimney-effect type of circulation develops. Modelling results also show that this convective heat transfer leads to the formation of a cold reservoir in the lower part of the talus slope, which can be crucial for maintaining the frozen ground conditions despite increasing air temperatures caused by climate change. © Author(s) 2017. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/75548
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| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
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作者单位: | Department of Geosciences, University of Fribourg, Fribourg, Switzerland
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| Recommended Citation: | |
Wicky J,, Hauck C. Numerical modelling of convective heat transport by air flow in permafrost talus slopes[J]. Cryosphere,2017-01-01,11(3)
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