| 摘要: |
| 为简化多针热脉冲技术获取地表热通量的测定方法，本研究基于热脉冲技术的方法原理以及传感器的设计准则，提出一种简化型多针热脉冲传感器，并对其田间实地测定结果进行评估。首先利用简化型传感器测定获取了0~50 mm土层热储量和50 mm深度处土壤热通量数据，估算得到地表热通量的动态变化；后与传统组合法(de Vries模型+自校正热通量板法)获取的地表热通量结果进行了对比分析。结果表明:简化型多针热脉冲传感器与传统组合法得到的地表热通量日变化趋势一致，对2种方法的测定值进行回归分析所得直线的斜率为1.09，决定系数为0.98；在测定时期内，简化型多针热脉冲技术获取田间地表热通量的平均绝对偏差为12.33 W/m2。因此，本研究中提出的简化型多针热脉冲技术可以用于准确监测田间地表热通量动态，可为农田水热过程和通量研究提供有效的监测手段。 |
| 关键词: 地表热通量 热储量 热脉冲技术 组合法 |
| DOI：10.11841/j.issn.1007-4333.2023.09.13 |
| 投稿时间：2022-12-18 |
| 基金项目:国家自然科学基金面上项目(41977011) |
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| In-situ monitoring ground heat flux with a simplified multi-needle heat-pulse technique |
|
LI Xinlin,LU Yili*,XIE Xiaoting,PENG Wei,REN Tusheng
|
| (College of Land Science and Technology, China Agricultural University, Beijing 100193, China) |
| Abstract: |
| In order to simplify the multi-needle heat-pulse technique for measuring ground heat flux, a simplified heat-pulse sensor for monitoring ground heat flux dynamics under field conditions was proposed in this study based on the theory and design criteria of heat pulse technique. The simplified sensor first measured the heat storage changes in the 0~50 mm soil layer and the soil heat fluxes at the 50 mm depth, and then obtained the dynamic ground heat flux via the sum of heat storage changes and fluxes. Finally, the field data measured by the sensor were compared with the data obtained by the traditional combination method(based on de Vries heat capacity model and heat flux plate method). The results showed that the simplified multi-needle heat-pulse sensor could provide reliable in-situ dynamics of ground heat flux density results. Compared with the results from the independent combination method, the linear regression of the results obtained from the two methods gave a slope of 1. 09 and a coefficient of determination of 0. 98, leading to a MAD value of 12. 33 W/m2 for the measured ground heat fluxes by the simplified sensor. In conclusion, the simplified sensor proposed in this study is effective in monitoring ground heat flux dynamics accurately and can provide reliable research tools for studying the heat and water processes. |
| Key words: ground heat flux heat storage multi-needle heat-pulse technique combination method |
