温度驱动下风积砂毛细现象试验研究

Experimental study on temperature driven aeolian sand capillarity

为了研究环境温度对毛细水上升过程的影响,进行了室内砂柱模拟试验。设置了两组不同温度下砂柱毛细水上升试验进行对比,分析了风积砂毛细水上升高度随时间的变化规律以及与温度的关系,探讨了毛细水上升的运动机理。试验结果表明:外部条件相同的情况下,较高的温度能够加快湿润锋的迁移速率,然而局部的高温会抑制水分的向上迁移,但温度效应不是特别明显。

In order to study the process of water movement in soils affected by temperature difference, the indoor sand column simulation experiment was carried. In this paper, there are two groups of dif- ferent temperature of sand column capillary water rise tests. Through experimental phenomenon and data collected to analyze the change law of aeolian sand rising height of capillary water with time, be- sides the relationship between rising heights of capillary water with temperature. In addition the move- ment mechanism of the capillary water rise was discussed. The test results show that, in external con- dition of the same circumstances, the higher temperature can accelerate the migration rate of the wet- ted front. However, the local high temperature can inhibit the upward migration of water, but the temperature effect is not obvious.