In situ soil moisture and thermal properties estimated using a dual-probe heat-pulse

IF 5.6 1区 农林科学 Q1 SOIL SCIENCE Geoderma Pub Date : 2024-10-01 DOI:10.1016/j.geoderma.2024.117064
Jie Liu , Bin Shi , Meng-Ya Sun , Jun-Cheng Yao , Ke Fang
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Abstract

In situ monitoring of the temporal and spatial distribution of soil moisture and thermal properties are important for studying the water and energy transport in the vadose zone. The single-probe heat-pulse method based on fiber Bragg grating technology (SPHP-FBG) has become a research focus in field monitoring because of its capability to realize quasi-distributed and real-time monitoring. However, the SPHP-FBG method can only obtain thermal conductivity. This study developed a dual-probe heat-pulse method based on FBG (DPHP-FBG). The DPHP-FBG method can measure thermal conductivity (λ), volumetric heat capacity (Cv), and thermal diffusivity (k). Consequently, volumetric soil water content (θ) can be estimated from its linear relationship with Cv. The accuracy of the DPHP-FBG method in the estimation of Cv, λ, and θ was tested under different heating duration and various soil moisture conditions. In addition, Monte Carlo simulation was performed to investigate the impact of FBG measurement errors on accuracy. Finally, a field test was conducted to verify the effectiveness of the developed DPHP-FBG system. The results show that the DPHP-FBG method allows accurate soil moisture and thermal properties estimation without soil-specific calibration. The mean errors of the Cv and θ decrease with the extended heating duration. When the heating lasts 20 s, the measured Cv and θ have mean errors of 0.02 MJ m−3 K−1 and 0.01 m3/m3, respectively, for various moisture conditions. In the field test, the spatio-temporal distribution of soil moisture and thermal properties can be obtained in real time. Thereby, the proposed DPHP-FBG monitoring system is potential to conduct in situ coupled heat and soil moisture measurements at a large scale.
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利用双探针热脉冲估算原地土壤湿度和热特性
对土壤水分和热特性的时空分布进行原位监测,对于研究地下水和能量传输非常重要。基于光纤布拉格光栅技术的单探针热脉冲法(SPHP-FBG)因其能够实现准分布式实时监测而成为野外监测的研究重点。然而,SPHP-FBG 方法只能获得热导率。本研究开发了一种基于 FBG 的双探针热脉冲方法(DPHP-FBG)。DPHP-FBG 方法可以测量热导率 (λ)、体积热容 (Cv) 和热扩散率 (k)。因此,可以根据其与 Cv 的线性关系估算出土壤容积含水量 (θ)。在不同的加热持续时间和各种土壤水分条件下,测试了 DPHP-FBG 方法估算 Cv、λ 和 θ 的准确性。此外,还进行了蒙特卡罗模拟,以研究 FBG 测量误差对精度的影响。最后,还进行了实地测试,以验证所开发的 DPHP-FBG 系统的有效性。结果表明,DPHP-FBG 方法无需针对特定土壤进行校准,即可准确估算土壤水分和热属性。Cv 和 θ 的平均误差随着加热时间的延长而减小。当加热持续 20 秒时,在各种湿度条件下,测得的 Cv 和 θ 平均误差分别为 0.02 MJ m-3 K-1 和 0.01 m3/m3。在现场测试中,可以实时获得土壤湿度和热特性的时空分布。因此,所提出的 DPHP-FBG 监测系统具有在大范围内进行原位热量和土壤水分耦合测量的潜力。
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来源期刊
Geoderma
Geoderma 农林科学-土壤科学
CiteScore
11.80
自引率
6.60%
发文量
597
审稿时长
58 days
期刊介绍: Geoderma - the global journal of soil science - welcomes authors, readers and soil research from all parts of the world, encourages worldwide soil studies, and embraces all aspects of soil science and its associated pedagogy. The journal particularly welcomes interdisciplinary work focusing on dynamic soil processes and functions across space and time.
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