Determining the In Situ Apparent Thermal Diffusivity of a Sandy Soil

Silva-Aguilar, Oscar; Arredondo, Jorge Alberto Andaverde; Fundora, Artemio Jesús Benitez

doi:10.1590/18069657rbcs20180025

Cited by 9 publications

(10 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various efforts have concentrated on improving the packaging of sensors to ease data collection (Fanelli and Lautz, 2008;Gordon et al, 2013;Rau et al, 2010;Tonina et al, 2014), still without fundamentally overcoming other limitations. Recent developments, including custom vertically resolved probes linked to commercial (Aguilar et al, 2018;Andújar Márquez et al, 2016;Naranjo and Turcotte, 2015) or in-house loggers (Beardsmore et al, 2020;Léger et al, 2019), as well as some commercially available systems, are still limited in their vertical resolution, flexibility, and cost effectiveness for wide deployment. While fiber-optic-based methods have been widely applied for temperature measurement in deep wells, infrastructures, and streambeds (Briggs et al, 2012), their deployment for shallow and vertically resolved depth profiling of temperature is still challenging (Lundquist and Lott, 2008).…”

Section: Introductionmentioning

confidence: 99%

A distributed temperature profiling system for vertically and laterally dense acquisition of soil and snow temperature

et al. 2022

View full text Add to dashboard Cite

Abstract. Measuring soil and snow temperature with high vertical and lateral resolution is critical for advancing the predictive understanding of thermal and hydro-biogeochemical processes that govern the behavior of environmental systems. Vertically resolved soil temperature measurements enable the estimation of soil thermal regimes, frozen-/thawed-layer thickness, thermal parameters, and heat and/or water fluxes. Similarly, they can be used to capture the snow depth and the snowpack thermal parameters and fluxes. However, these measurements are challenging to acquire using conventional approaches due to their total cost, their limited vertical resolution, and their large installation footprint. This study presents the development and validation of a novel distributed temperature profiling (DTP) system that addresses these challenges. The system leverages digital temperature sensors to provide unprecedented, finely resolved depth profiles of temperature measurements with flexibility in system geometry and vertical resolution. The integrated miniaturized logger enables automated data acquisition, management, and wireless transfer. A novel calibration approach adapted to the DTP system confirms the factory-assured sensor accuracy of ±0.1 ∘C and enables improving it to ±0.015 ∘C. Numerical experiments indicate that, under normal environmental conditions, an additional error of 0.01 % in amplitude and 70 s time delay in amplitude for a diurnal period can be expected, owing to the DTP housing. We demonstrate the DTP systems capability at two field sites, one focused on understanding how snow dynamics influence mountainous water resources and the other focused on understanding how soil properties influence carbon cycling. Results indicate that the DTP system reliably captures the dynamics in snow depth and soil freezing and thawing depth, enabling advances in understanding the intensity and timing in surface processes and their impact on subsurface thermohydrological regimes. Overall, the DTP system fulfills the needs for data accuracy, minimal power consumption, and low total cost, enabling advances in the multiscale understanding of various cryospheric and hydro-biogeochemical processes.

show abstract

Section: Introductionmentioning

confidence: 99%

A distributed temperature profiling system for vertically and laterally dense acquisition of soil and snow temperature

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Such pronounced peak values of α (0.83-0.99 mm 2 /s) were demonstrated for sandy soils at low water contents by Lebedev et al (2019). Silva-Aguilar et al (2018) reported that values of the apparent thermal diffusivity ranged between 0.23 and 0.87 mm 2 /s for sandy soils.…”

mentioning

confidence: 80%

Thermal properties of Cambisols in mountain regions under different vegetation covers

Doneva¹,

Kercheva²,

Dimitrov³

et al. 2022

Soil & Water Res.

View full text Add to dashboard Cite

Soil thermal properties regulate the thermal and water balance and influence the soil temperature distribution. The aim of the current study is to present data on the changes in the thermal properties of Cambisols at different ratios between the water content and the air in the pore space under different vegetation covers in mountain regions. The undisturbed soil samples were taken from the surface soil layers under grassland, deciduous and coniferous forests in three experimental stations of the Forest Research Institute – Gabra in Lozen Mountain, Govedartsi in Rila Mountain and Igralishte in Maleshevska Mountain. The soil thermal conductivity (λ), the thermal diffusivity (α) and the volumetric heat capacity (C<sub>v</sub>) were measured with the SH-1 sensor of a KD2Pro device at different matric potentials in laboratory conditions. The thermal conductivity of the investigated soils was also measured with the TR-1 sensor of a KD2Pro device at the transitory soil moisture in field conditions. An increase in the thermal properties with the soil water content was best pronounced for λ and depended inversely on the total porosity. As the total porosity increased with the soil organic carbon content and decreased with the skeleton content, the lowest value of λ was established in the surface horizons of Dystric Cambisols (Humic) in the experimental station in Govedartsi. The soil thermal conductivity increased with the depth under the deciduous forest (Gabra and Igralishte) due to the lower soil organic carbon content (SOC) and the total porosity. There were no such changes in the subsurface horizon under the grassed associations. The increase in the heat capacity with the water content depended on the SOC to less extent. In the horizons with a SOC of less than 1.5%, the changes in the thermal diffusivity over the whole range of wetness were 1.7 times higher than those with a higher SOC.

show abstract

“…Cable et al (2016) used this calibration approach to increase the accuracy of thermistors from 0.1ºC to approximately 0.02ºC for subsurface temperature measurements. While temperature-controlled water baths at temperatures above 0ºC (Aguilar et al, 2018;Naranjo and Turcotte, 2015) can be used for calibration using a reference thermometer, reaching an accuracy of 0.01ºC is challenging.…”

Section: Dtp Sensor Accuracy Assessment and Calibrationmentioning

confidence: 99%

“…Various efforts have concentrated on improving the packaging of sensors to ease data collection (Fanelli and Lautz, 2008;Gordon et al, 2013;Rau et al, 2010;Tonina et al, 2014), still without fundamentally overcoming other limitations. Recent developments, including custom vertically resolved probes linked to commercial (Aguilar et al, 2018;Andújar Márquez et al, 2016;Naranjo and Turcotte, 2015) or in-house loggers (Beardsmore et al, 2020;Léger et al, 2019), as well as some commercially available systems, are still limited in their vertical resolution, flexibility, and cost effectiveness for wide deployment. While fiber optic-based methods have been widely applied for temperature measurement in deep wells, infrastructures, and streambeds (Briggs et al, 2012), their deployment for numerous shallow and vertically resolved depth profiling of temperature is still challenging.…”

Section: Introductionmentioning

confidence: 99%

A Distributed Temperature Profiling System for Vertically and Laterally Dense Acquisition of Soil and Snow Temperature

Dafflon

Wielandt

Lamb

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. Measuring soil and snow temperature with high vertical and lateral resolution is critical for advancing the predictive understanding of thermal and hydro-biogeochemical processes that govern the behavior of environmental systems. Vertically resolved soil temperature measurements enable the estimation of soil thermal regimes, freeze/thaw layer thickness, thermal parameters, and heat and/or water fluxes. Similarly, they can be used to capture the snow thickness and the snowpack thermal parameters and fluxes. However, these measurements are challenging to acquire using conventional approaches due to their total cost, their limited vertical resolution, and their large installation footprint. This study presents the development and validation of a novel Distributed Temperature Profiling (DTP) system that addresses these challenges. The system leverages digital temperature sensors to provide unprecedented, finely resolved depth-profiles of temperature measurements with flexibility in system geometry and vertical resolution. The integrated miniaturized logger enables automated data acquisition, management, and wireless transfer. A novel calibration approach adapted to the DTP system confirms the factory-assured sensor accuracy of +/−0.1 °C and enables improving it to +/−0.015 °C. Numerical experiments indicate that, under normal environmental conditions, an additional error of 0.01 % in amplitude and 70 seconds time delay in amplitude for a diurnal period can be expected, owing to the DTP housing. We demonstrate the DTP systems capability at two field sites, one focused on understanding how snow dynamics influence mountainous water resources, and the other focused on understanding how soil properties influence carbon cycling. Results indicate that the DTP system reliably captures the dynamics in snow thickness, and soil freezing and thawing depth, enabling advances in understanding the intensity and timing in surface processes and their impact on subsurface thermal-hydrological regimes. Overall, the DTP system fulfills the needs for data accuracy, minimal power consumption, and low total cost, enabling advances in the multiscale understanding of various cryospheric and hydro-biogeochemical processes.

show abstract

Determining the In Situ Apparent Thermal Diffusivity of a Sandy Soil

Cited by 9 publications

References 13 publications

A distributed temperature profiling system for vertically and laterally dense acquisition of soil and snow temperature

A distributed temperature profiling system for vertically and laterally dense acquisition of soil and snow temperature

Thermal properties of Cambisols in mountain regions under different vegetation covers

A Distributed Temperature Profiling System for Vertically and Laterally Dense Acquisition of Soil and Snow Temperature

Contact Info

Product

Resources

About