青藏高原理塘地区土壤热参数的确定及其土壤温度模拟试验
发布时间：2019-07-06 21:31
【摘要】：为了准确获取青藏高原理塘地区的土壤热参数,利用2006年8月27日至9月4日期间青藏高原理塘地区陆面过程试验采集的土壤温度资料,分别采用位相法、振幅法以及耦合热传导-对流法计算了0~10 cm,10~15 cm,15~20 cm三层土壤热扩散率,并用耦合热传导-对流法计算了土壤液态水通量密度。根据计算结果,以地表温度作为上边界条件,分别模拟了9月19-21日期间10 cm、15 cm和20 cm三个深度的土壤温度。对比模拟值与观测值后发现:由于考虑了土壤中液态水的动态变化,耦合热传导-对流法对各层土壤温度模拟效果最为理想,其模拟值与观测值的相关系数分别为:r10cm=0.97、r15cm=0.98、r20cm=0.99,置信度为99%。其中,对10 cm深度而言,耦合热传导-对流法模拟的土壤温度位相比实际观测值平均前移约0.21 h,土壤温度日振幅比实际值高估约0.79℃,而振幅法则平均前移约0.45 h,位相法高估土壤温度日振幅约0.96℃。
文内图片：
图片说明：图22006年8月27日至9月4日0cm(a)，10cm，，15cm和20cm(b)四层土壤温度观测值及其正弦拟合曲线
[Abstract]:In order to accurately obtain the soil thermal parameters in Litang area of Qinghai-Xizang Plateau, the soil temperature data collected from the land surface process test in Litang area of Qinghai-Xizang Plateau from August 27 to September 4, 2006 were used to calculate the thermal diffusion rate of 0 脳 10 cm,10~15 cm,15~20 cm three-layer soil by phase method, amplitude method and coupled heat conduction-convolution method, and the soil liquid water flux density was calculated by coupling heat conduction-convolution method. According to the calculated results, the soil temperatures of 10 cm,15 cm and 20 cm were simulated with surface temperature as the upper boundary condition from September 19 to 21, respectively. After comparing the simulated values with the observed values, it is found that the coupled heat conduction-convolution method has the best simulation effect on the soil temperature of each layer due to the consideration of the dynamic changes of liquid water in the soil. The correlation coefficients between the simulated values and the observed values are as follows: r10cm 鈮
本文编号：2511344
文内图片：
图片说明：图22006年8月27日至9月4日0cm(a)，10cm，，15cm和20cm(b)四层土壤温度观测值及其正弦拟合曲线
[Abstract]:In order to accurately obtain the soil thermal parameters in Litang area of Qinghai-Xizang Plateau, the soil temperature data collected from the land surface process test in Litang area of Qinghai-Xizang Plateau from August 27 to September 4, 2006 were used to calculate the thermal diffusion rate of 0 脳 10 cm,10~15 cm,15~20 cm three-layer soil by phase method, amplitude method and coupled heat conduction-convolution method, and the soil liquid water flux density was calculated by coupling heat conduction-convolution method. According to the calculated results, the soil temperatures of 10 cm,15 cm and 20 cm were simulated with surface temperature as the upper boundary condition from September 19 to 21, respectively. After comparing the simulated values with the observed values, it is found that the coupled heat conduction-convolution method has the best simulation effect on the soil temperature of each layer due to the consideration of the dynamic changes of liquid water in the soil. The correlation coefficients between the simulated values and the observed values are as follows: r10cm 鈮
本文编号：2511344
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