Analysis of heat pulse measurements in double-layered soils with the heating probe positioned at the layer interface
Analysis of heat pulse measurements in double-layered soils with the heating probe positioned at the layer interface
复制标题
使用位于层界面的加热探头对双层土壤中的热脉冲测量进行分析
DOI：
10.1016/j.geoderma.2022.115987
复制
发表时间：
2022
期刊：
影响因子：
6.1
通讯作者：
Horton, Robert
中科院分区：
文献类型：
--
作者：
Peng, Wei;Lu, Yili;Ren, Tusheng;Horton, Robert
在热脉冲（HP）传感器安装在分层土壤中且加热和感测探头位于不同层的情况下，HP测量违反了用于解释HP数据的圆柱形理想导体（CPC）理论的土壤均匀性的基本假设。在这项研究中，进行了实验室和数值研究，以评估热传递模式和模型，以分析HP测量数据时，加热探头被定位在具有不同的上层和下层属性的双层土壤的界面。提出了一个参数化的hetero-CPC模型来描述温度随时间变化的曲线在传感器在上，下土层。异质CPC估计值与模拟值吻合较好，其精度依赖于土壤层之间的热性质差异。热脉冲输入引起的热量分布在分层的土壤中显示出半圆形等温线，具有不同的半径的热源为中心，因此显示出差异的热通量的上部和下部的土壤层。所提出的hetero-CPC模型能够准确地描述有限的探头属性和异质土壤热属性值的HP数据在一个双层土壤系统的加热探头定位在层界面上的综合影响。
In the case where a heat-pulse (HP) sensor installed in a layered soil with the heating and sensing probes positioned at different layers, the HP measurement violates the underlying assumption of soil homogeneity for the cylindrical perfect conductors (CPC) theory that is used to interpret the HP data. In this study, laboratory and numerical studies were performed to evaluate the heat transfer patterns and models to analyze HP measurement data when heating probe was positioned at the interface of a double-layered soil with different upper- and lower-layer properties. A parameterized hetero-CPC model was proposed to describe temperature-by-time curves at the sensing probes in the upper and lower soil layers. The hetero-CPC estimates matched well with the simulated values, and its accuracy relied on the thermal property differences between the soil layers. The heat distributions caused by heat pulse inputs in the layered soils showed semi-circular isotherms with different radii centered on the heating source, therefore showing discrepancies in heat fluxes for the upper and lower soil layers. The proposed hetero-CPC model was able to accurately describe the combined effects of finite probe properties and heterogeneous soil thermal property values on the HP data in a double-layered soil system with the heating probe positioned at the layer interface.