[关键词]
[摘要]
土壤热参数对估算地表热通量和研究地表能量平衡具有重要的意义。基于土壤温度实测资料, 利用谐波法和 热传导对流法估算了浅层土壤热扩散率, 进而计算了土壤热通量的值, 并将结果与热通量板观测值进行对比, 验证 了这两种方法的可靠性。结果表明: 谐波法和热传导对流法估算的风积沙热扩散率结果均比较合理; 谐波法能够较 好地模拟土壤剖面温度, 而热传导对流法的模拟结果较差; 谐波法会低估白天热通量最大值和晚上热通量最小值, 而热传导对流法能够较好地模拟夜间的土壤热通量。
[Key word]
[Abstract]
Soil thermal parameters play an important role in estimating ground heat flux and investigating ground energy balance. In this paper, based on the measured soil temperature data, thermal diffusivity of shallow soil was estimated using the harmonic method and heat conductivity and convection method, and then the heat flux was calculated and compared with that measured by the heat flux plate to verify the applicability of the two methods. T he results showed that (1) the thermal diffusivities estimated by both the harmonic method and conductivity and convection method are reasonable; ( 2) the harmonic method can simulate the soil temperature of vertical profile better than the heat conductivity and convection method; and ( 3) the harmonic method under2 estimates the maximum heat flux during daytime and minimum heat flux at night, whereas the heat conductivity and convection method can perform good simulation of soil heat flux at night.
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[基金项目]
国家自然科学基金重点项目/ 旱区地表- 地下水系统界面动力学与水循环研究0( 41230314) ; 国家自然科学基金项目/ 毛乌素沙 地地表干沙层形成机理及其水文生态效应研究0( 41272247) ; 国家青年科学基金项目/ 渭河流域地下水对气候变化的响应研究0 (41202164) ; 陕西省自然科学基金/ 陕北风沙滩区河水- 地下水转化的温度示踪0( 2014JQ5187)