Estimating interaction between surface water and groundwater in a permafrost region using heat tracing methods

Gao, Tanguang; Liu, Jie; Zhang, Tingjun; Hu, Yuantao; Shang, Jianguo; Wang, Shufa; Xiao, Xiongxin; Liu, Chuankun; Kang, Shichang

doi:10.5194/tc-2017-176

Cited by 2 publications

(2 citation statements)

References 46 publications

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“…By contrasting Control-NoSurf with Control-NoConv, we found many cooling events occurring at intermediate depths (0.4-1.3 m) within the soils and associated with upward water migration driven by the hydraulic gradient, resulting in higher simulated soil temperature simulated in NoConv (which completely removes the CHT process) than in Control. Some previous studies (Gao et al, 2020;Li et al, 2016) have reported that the melting occurring at the permafrost table provides water supply to the upper depths. Effects on the thermal and hydrological regimes of the entire active layer due to the upward liquid movement have also been reported Cui et al, 2020;Rowland et al, 2011).…”

Section: Bidirectional Thermal Impacts Of Convective Heat Transfermentioning

confidence: 97%

Convective heat transfer of spring meltwater accelerates active layer phase change in Tibet permafrost areas

Zhao

Zhang

et al. 2022

The Cryosphere

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Abstract. Convective heat transfer (CHT) is one of the important processes that control the near-ground surface heat transfer in permafrost areas. However, this process has often not been considered in most permafrost studies, and its influence on freezing–thawing processes in the active layer lacks quantitative investigation. The Simultaneous Heat and Water (SHAW) model, one of the few land surface models in which the CHT process is well incorporated into the soil heat–mass transport processes, was applied in this study to investigate the impacts of CHT on the thermal dynamics of the active layer at the Tanggula station, a typical permafrost site on the eastern Qinghai–Tibet Plateau with abundant meteorological and soil temperature and soil moisture observation data. A control experiment was carried out to quantify the changes in active layer temperature affected by vertical advection of liquid water. Three experimental setups were used: (1) the original SHAW model with full consideration of CHT, (2) a modified SHAW model that ignores CHT due to infiltration from the surface, and (3) a modified SHAW model that completely ignores CHT processes in the system. The results show that the CHT events occurred mainly during thaw periods in melted shallow (0–0.2 m) and intermediate (0.4–1.3 m) soil depths, and their impacts on soil temperature at shallow depths were significantly greater during spring melting periods than summer. The impact was minimal during freeze periods and in deep soil layers. During thaw periods, temperatures at the shallow and intermediate soil depths simulated under the scenario considering CHT were on average about 0.9 and 0.4 ∘C higher, respectively, than under the scenarios ignoring CHT. The ending dates of the zero-curtain effect were substantially advanced when CHT was considered due to its heating effect. However, the opposite cooling effect was also present but not as frequently as heating due to upward liquid fluxes and thermal differences between soil layers. In some periods, the advection flow from the cold layer reduced the shallow and intermediate depth temperatures by an average of about −1.0 and −0.4 ∘C, respectively. The overall annual effect of CHT due to liquid flux is to increase soil temperature in the active layer and favor thawing of frozen ground at the study site.

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Section: Bidirectional Thermal Impacts Of Convective Heat Transfermentioning

confidence: 97%

Convective heat transfer of spring meltwater accelerates active layer phase change in Tibet permafrost areas

Zhao

Zhang

et al. 2022

The Cryosphere

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“…Measuring the temperature is fast and less costly than measuring the solute concentration. Moreover, it is an environmental tracer—variations in groundwater temperature already occur naturally due to the surface water or fracture inflows [11]. Active heat tracing experiments involve either heating a discrete volume of groundwater or injecting hot/cold water into an aquifer [12,13].…”

Section: Introductionmentioning

confidence: 99%

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Drusová

Bakx

Wexler³

et al. 2019

Sensors

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An understanding of groundwater flow near drinking water extraction wells is crucial when it comes to avoiding well clogging and pollution. A promising new approach to groundwater flow monitoring is the deployment of a network of optical fibers with fiber Bragg grating (FBG) sensors. In preparation for a field experiment, a laboratory scale aquifer was constructed to investigate the feasibility of FBG sensors for this application. Multiparameter FBG sensors were able to detect changes in temperature, pressure, and fiber shape with sensitivities influenced by the packaging. The first results showed that, in a simulated environment with a flow velocity of 2.9 m/d, FBG strain effects were more pronounced than initially expected. FBG sensors of a pressure-induced strain implemented in a spatial array could form a multiplexed sensor for the groundwater flow direction and magnitude. Within the scope of this research, key technical specifications of FBG interrogators for groundwater flow sensing were also identified.

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Estimating interaction between surface water and groundwater in a permafrost region using heat tracing methods

Cited by 2 publications

References 46 publications

Convective heat transfer of spring meltwater accelerates active layer phase change in Tibet permafrost areas

Convective heat transfer of spring meltwater accelerates active layer phase change in Tibet permafrost areas

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

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