Wind effects on soil thermal properties measured by the dual-probe heat pulse method
Wind effects on soil thermal properties measured by the dual-probe heat pulse method
复制标题
双探头热脉冲法测量风对土壤热性质的影响
DOI：
10.1002/saj2.20041
复制
发表时间：
2020
影响因子：
2.9
通讯作者：
Horton Robert
中科院分区：
文献类型：
--
作者：
Sang Yujie;Liu Gang;Horton Robert
当双探头热脉冲（DPHP）传感器被安装在土壤-大气界面附近时，由于风的存在，无限长线热源（ILS）模型及其改进的绝热边界条件无限长线热源模型（ILS-ABC）的基本假设可能不被满足。本研究旨在探索风对DPHP测量的影响，并比较ILS和ILS-ABC模型在不同风速（λ）和埋深（d）值下的性能。研究表明，室内实验、COMSOL模拟和现场实验的结果是一致的。对于d ≤ 4 mm的干沙，当风速≥ 3.5 m s− 1时，风的影响不可忽略，无论使用ILS模型还是ILS-ABC模型，DPHP方法都不能提供准确的估计。现场实验容易出现大的背景温度波动，这可能导致常用的线性去趋势方法性能不佳。一般来说，在λ < 2.7 m s− 1 in和d = 5 mm的情况下，ILS-ABC模型提供了更准确的估计，热导率的相对误差<15%，热容的相对误差<9%。
When a dual‐probe heat pulse (DPHP) sensor is installed in soil near the soil–atmosphere interface, the basic assumptions of the infinite line heat source (ILS) model and its improvement, the infinite line heat source model with an adiabatic boundary condition (ILS‐ABC) might not be satisfied because of wind. This study aims to explore the effects of wind on DPHP measurements and to compare the performance of the ILS and ILS‐ABC models at different values of wind velocity (υ) and burial depth (d). Our study shows that the results of laboratory experiments, COMSOL simulations, and field experiments are consistent with each other. For dry sand withd≤ 4 mm, the effects of wind is non‐negligible atυ≥ 3.5 m s−1and the DPHP method does not provide accurate estimations whether the ILS model or the ILS‐ABC model is used. Field experiments are prone to large background temperature fluctuations, which can cause a commonly used linear detrending method to perform poorly. In general, atυ< 2.7 m s−1in field andd= 5 mm, the ILS‐ABC model provides more accurate estimations with relative errors of <15% in thermal conductivity and relative errors of <9% in heat capacity.