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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Earth hummocks (thufur): new insights to their thermal characteristics and development in eastern Lesotho, southern Africa
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Earth hummocks (thufur): new insights to their thermal characteristics and development in eastern Lesotho, southern Africa

机译：土丘（thufur）：关于非洲南部莱索托的热特征和发展的新见解

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摘要

The aspect-controlled variations in soil freezing within earth hummocks of eastern Lesotho (southern Africa) are analysed. Ground thermal data were measured for an earth hummock from late autumn to early spring in 1995 and 1996, using Tinytalk (TM) data loggers. During 1995, ground temperatures were recorded at 15 and 20 cm depth on the hummock north, east, south and west aspects, whilst in 1996 temperatures were recorded at 1 cm, 5 cm and 10 cm on the north and south aspects. The data from 1995 indicate that soil freezing commences on the hummock southern aspects and gradually progresses towards the western and northern aspects,whilst the eastern aspect remained unfrozen throughout winter. The data from 1996 indicate that a thick snow cover almost nullifies the temperature differences between the hummock northern and southern aspects. However, given the relative absence of snow during contemporary winters, freeze intensity and duration is longest on the hummock southern and western aspects, which helps explain earth hummock deformation (elongation and coalescence) in a southwesterly direction on slope gradients <= 3 degrees. Copyright (c) 2005 John Wiley & Sons, Ltd.
机译：分析了莱索托东部（非洲南部）土丘内土壤冻结的纵横比变化。使用Tinytalk（TM）数据记录仪在1995年和1996年秋季末至初春期间测量了地表的地热数据。在1995年期间，记录的山岗北，东，南和西方面的地面温度分别为15和20厘米，而在1996年，北，南方面的温度分别为1厘米，5厘米和10厘米。 1995年的数据表明，土壤冻结从山岗南部开始，并逐渐向西部和北部发展，而东部在整个冬季都未冻结。 1996年的数据表明，厚厚的积雪几乎抵消了山岗北部和南部之间的温差。但是，鉴于当代冬季相对没有积雪，在南面和西面的山岗上，冻结强度和持续时间最长，这有助于解释坡度小于等于3度的西南方向上的地球山岗变形（伸长和聚结）。版权所有（c）2005 John Wiley＆Sons，Ltd.

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