Water retention and thermal conductivity of a natural unsaturated loess
Water retention and thermal conductivity of a natural unsaturated loess
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DOI：
10.1680/jgele.17.00037
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发表时间：
2017-11
影响因子：
2.1
通讯作者：
V. Nguyen;H. Heindl;Jean-Michel Pereira;A. Tang;J. Frost
中科院分区：
文献类型：
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作者：
V. Nguyen;H. Heindl;Jean-Michel Pereira;A. Tang;J. Frost
黄土覆盖了地球表面的大部分。黄土沉积物通常由含有粘土和细砂颗粒的粉土组成，厚度通常达到几米。黄土的导热系数在0·07至2 W/（m.K）的较大范围内变化，取决于颗粒组成、土壤质地和含水量。在这项研究中，完整的黄土取样浅深度（1米）在北方法国。吸力，体积含水量和导热系数的土壤进行了测量，同时在湿/干周期的样品应用。结果表明，体积含水率对土壤导热系数有显著影响。与保水曲线的情况一样，当绘制热导率对吸力的曲线时，可以观察到滞后回线。然而，没有滞后出现时，导热率作为饱和度的函数绘制。
Loess covers large portions of Earth's surface. Loess deposits are typically composed of silt with clay and fine sand particles and usually reach a few meters in thickness. Thermal conductivity of loess varies over a relatively large range from 0·07 to 2 W/(m.K), depending on the particle composition, soil texture and also moisture content. In this study, intact loess was sampled at shallow depth (1 m) in Northern France. Suction, volumetric moisture content and thermal conductivity of soil were measured simultaneously during the application of wetting/drying cycles to the sample. The results show that the volumetric moisture content significantly influences the soil thermal conductivity. As is the case for the water-retention curve, a hysteresis loop can be observed when plotting the thermal conductivity against suction. However, no hysteresis appears when the thermal conductivity is plotted as a function of the degree of saturation.