塔克拉玛干沙漠地表浅层土壤热扩散率、温度和热通量计算方法的比较研究

发布时间：2018-03-29 21:13

  本文选题：塔克拉玛干沙漠　切入点：土壤热扩散率　出处：《土壤通报》2016年04期

【摘要】：利用塔克拉玛干沙漠大气环境观测站2008年7月30日至8月4日的土壤温度、湿度和土壤热通量观测资料,定量分析了沙漠土壤热扩散率、温度、热通量的变化规律。采用谐波法、振幅法、相位法和热传导对流法分别计算了5~20 cm沙漠土壤的热扩散率,在此基础上,以5 cm深度的土壤层为上边界条件,计算了10和20 cm深度的土壤温度和8 cm深度的土壤热通量。结果表明:谐波法计算沙漠土壤温度的精度最高,10和20 cm深度的土壤温度计算值与观测值的标准误差分别为0.167℃和0.127℃;热传导对流法对土壤温度的计算结果好于振幅法和相位法。同样,谐波法计算的沙漠土壤热通量值与观测值的误差最小,计算值与观测值的相关系数R2达到0.976,热传导对流法次之,振幅法和相位法的误差最大。
[Abstract]:Based on the observation data of soil temperature, humidity and soil heat flux from July 30 to August 4, 2008, the thermal diffusivity and temperature of desert soil were quantitatively analyzed. The thermal diffusivity of 5 ~ 20 cm desert soil was calculated by harmonic method, amplitude method, phase method and heat conduction convection method respectively. On this basis, the soil layer of 5 cm depth was taken as the upper boundary condition. The soil temperature at the depth of 10 cm and 20 cm and the soil heat flux at the depth of 8 cm were calculated. The results show that the harmonic method has the highest accuracy in calculating the soil temperature at the depth of 10 cm and 20 cm and the standard error between the observed value and the calculated value of the soil temperature at the depth of 10 cm and 20 cm. 0.167 鈩，

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