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利用甘肃黄土高原代表站地温、土壤含水量及降水资料,运用统计模拟方法,分析了土壤温度的日变化及土中热交换特性,评述了水热耦合效应。地温的日变化特性用谐波分析方法描述,各季典型天气下24小时热通量值由热平衡台站规范方法计算。结果表明,各层次地温的日变化基本表现为一阶谐波,这种正弦的波形尤以晴天最为明显。不同季节典型天气下土中热通量的变化由正值转为负值的时间基本一致出现在16时,阴天提前1时,由负值转为正值的时间基本一致出现在7时,冬季阴天出现在9时。水热交互作用与土壤含水量的变化有显著相关关系。
Based on the data of ground temperature, soil moisture and precipitation from the representative stations of Gansu Loess Plateau, the daily variation of soil temperature and the heat exchange characteristics in soil were analyzed by statistical simulation method. The effect of water-heat coupling was also reviewed. The diurnal variation of geothermal temperature is described by harmonic analysis, and the 24-hour heat flux value under typical weather for each season is calculated by the thermal balance station specification method. The results show that the diurnal variation of ground temperature is basically the first order harmonic at all levels, and the sine waveform is most obvious especially in sunny days. In different seasons, the time when the change of soil heat flux changed from positive to negative in the typical weather occurred basically at 16 o’clock and 1 o’clock in advance of cloudy day, and the time from negative to positive changed basically at 7 o’clock, Cloudy in winter at 9 o’clock. The hydrothermal interaction has a significant correlation with the change of soil water content.