scholarly journals Disturbances of Temperature-Depth Profiles by Surface Warming and Groundwater Flow Convection in Kumamoto Plain, Japan

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Linyao Dong ◽  
Congsheng Fu ◽  
Jigen Liu ◽  
Yifeng Wang
Keyword(s):  
Groundwater Flow ◽  
Subsurface Water ◽  
Subsurface Temperature ◽  
Flow Perturbation ◽  
Surface Warming ◽  
Heat Flows ◽  
Depth Profiles ◽  
Basin Scale ◽  
Thermal Regimes ◽  
Temperature Depth

Subsurface temperatures depend on climate and groundwater flow. A lack of observations of subsurface temperature collected over decades limits interpretation of the combined influences of surface warming and groundwater flow on subsurface thermal regimes. Subsurface temperature-depth profile data acquired for Kumamoto Plain, Japan, between 1987 and 2012 were collected and analyzed to elucidate regional groundwater and heat flows. The observed and simulated temperature-depth profiles showed the following: subsurface water flows from northeast to southwest in the study area; the combined influence of surface warming and water flow perturbation produces different temporal changes in thermal profiles in recharge, intermediate, and discharge areas; and aquifer thermal properties contribute more than hydraulic parameters to the perturbation of temperature-depth profiles. Spatial and temporal evolution features of subsurface thermal regimes may be utilized to investigate the influence of surface warming events on subsurface water and heat flows at the basin scale.

Interpreting Repeated Temperature-Depth Profiles for Groundwater Flow

2017 ◽  
Vol 53 (10) ◽  
pp. 8639-8647 ◽  
Author(s):  
Victor F. Bense ◽  
Barret L. Kurylyk ◽  
Jonathan van Daal ◽  
Martine J. van der Ploeg ◽  
Sean K. Carey
Keyword(s):  
Groundwater Flow ◽  
Depth Profiles ◽  
Temperature Depth

Recent trends of groundwater temperatures in Bavaria, Germany

2020 ◽  
Author(s):  
Hannes Hemmerle ◽  
Peter Bayer
Keyword(s):  
Climate Change ◽  
Air Temperature ◽  
Ground Surface ◽  
Temperature History ◽  
Seasonal Temperature ◽  
Subsurface Temperature ◽  
Temperature Variations ◽  
Depth Profiles ◽  
Recent Climate ◽  
Temperature Depth

<p>Surface temperature variations have been well shown to transfer their thermal signature into the subsurface. This continuous heat transfer manifests in altered thermal conditions in the subsurface where temperature variations over a long lapse of time are more pronounced than shorter ones. Hence, repeated temperature depth profiles allow to investigate the effects of recent climate change on the subsurface. In this study we present recent temperature trends in more than 40 observation wells in Bavaria, Germany. Temperature depth profiles have been quarterly measured for one year between 1992-1994 and measurements have been repeated two times in 2019. The quarterly measurements reveal that the periodic seasonal temperature signal dampens to around 0.1 K at a depth of 15 m below ground surface. This implies that temperature variations below this depth can be used as climate archives as they store the temperature history of multiple years. The measurements span a time period of almost 30 years which is the most common period of reference for deriving climate normals according to the World Meteorological Organization. Therefore, the findings of recent subsurface temperature variations are assessed versus and complemented by 22 air temperature stations. Preliminary results show, that the linear regression of the annual mean air temperature since 1990 yields a slope of 0.35 ± 0.11 K 10a<sup>-1</sup>. In the subsurface, median temperature differences of the respective baselines from 1992-94 period and 2019 are 0.26, 0.13 and 0.07 K 10a<sup>-1 </sup>at 20, 40 and 60 m depth below surface, accordingly. Despite the common magnitude and continuous downward decrease, subsurface temperature differences exhibit a much higher variance compared to air temperature changes. This is due to local effects, such as varying thermal conductivities of the subsurface, latent heat transport caused by evapotranspiration, lateral and vertical groundwater flow, and anthropogenic influences. Our contribution will feature a comparison of this temperature change in response to recent atmospheric climate change in Bavaria and link these results with perceptions gained by similar investigations on local scale in other European regions.</p>

Groundwater flow estimation using temperature-depth profiles in a complex environment and a changing climate

2017 ◽  
Vol 574 ◽  
pp. 272-281 ◽  
Author(s):  
Dylan J. Irvine ◽  
Barret L. Kurylyk ◽  
Ian Cartwright ◽  
Mariah Bonham ◽  
Vincent E.A. Post ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Complex Environment ◽  
Flow Estimation ◽  
Depth Profiles ◽  
Changing Climate ◽  
Temperature Depth
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