Thermal plume transport from sand and gravel pits – Potential thermal impacts on cool water streams

Markle, Jeff M.; Schincariol, Robert A.

doi:10.1016/j.jhydrol.2007.02.031

Cited by 37 publications

(16 citation statements)

References 139 publications

(185 reference statements)

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“…The modification occurs because of the heat exchange between water and rock, causing both damping (i.e., decrease in signal amplitude) and retardation (i.e., time lag of the signal) of recharge . Studies have also demonstrated thermal damping and retardation in porous media (e.g., Molson et al, 1992;Palmer et al, 1992;Markle and Schincariol, 2007) and fractures (e.g., Molson et al, 2007). The nonconservative nature of water temperature, even within fairly large conduits, facilitates estimates of conduit size via an analysis of input and output thermographs Luhmann et al, 2012;Birk et al, 2014).…”

Section: A J Luhmann Et Al: Thermal Damping and Retardation In Karmentioning

confidence: 99%

Thermal damping and retardation in karst conduits

Luhmann

Covington²,

Myre³

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. Water temperature is a non-conservative tracer in the environment. Variations in recharge temperature are damped and retarded as water moves through an aquifer due to heat exchange between water and rock. However, within karst aquifers, seasonal and short-term fluctuations in recharge temperature are often transmitted over long distances before they are fully damped. Using analytical solutions and numerical simulations, we develop relationships that describe the effect of flow path properties, flow-through time, recharge characteristics, and water and rock physical properties on the damping and retardation of thermal peaks/troughs in karst conduits. Using these relationships, one can estimate the thermal retardation and damping that would occur under given conditions with a given conduit geometry. Ultimately, these relationships can be used with thermal damping and retardation field data to estimate parameters such as conduit diameter. We also examine sets of numerical simulations where we relax some of the assumptions used to develop these relationships, testing the effects of variable diameter, variable velocity, open channels, and recharge shape on thermal damping and retardation to provide some constraints on uncertainty. Finally, we discuss a multitracer experiment that provides some field confirmation of our relationships. High temporal resolution water temperature data are required to obtain sufficient constraints on the magnitude and timing of thermal peaks and troughs in order to take full advantage of water temperature as a tracer.

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Section: A J Luhmann Et Al: Thermal Damping and Retardation In Karmentioning

confidence: 99%

Thermal damping and retardation in karst conduits

Luhmann

Covington²,

Myre³

et al. 2015

Hydrol. Earth Syst. Sci.

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show abstract

“…At the Central Delhi Site, in contrast, the observed minimum/maximum peaks at 10 m bgl are most pronounced in February/September (8 months after the peaks in the river). Assuming a typical thermal retardation factor around 2 for sand aquifers (Markle and Schincariol 2007), travel time from Yamuna to the shallow piezometers can be estimated to be in the range of a few weeks at Palla and several months at Central Delhi.…”

Section: Temperature Profilesmentioning

confidence: 99%

Assessment of the potential for bank filtration in a water-stressed megacity (Delhi, India)

et al. 2010

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In the densely populated semi-arid territory around Delhi, the water demand is rising continuously, while the surface-and groundwater resources are threatened by contamination and overexploitation. This is a typical scenario in many newly industrialising and developing countries, where new approaches for a responsible resources management have to be found. Bank filtration holds a great potential, thus being a low tech method and benefiting from the storage and contaminant attenuation capacity of the natural soil/rock. For this study, three field sites have been constructed to investigate bank filtration in different environments in and around the megacity with a main focus on inorganic contaminants. Hydraulic heads, temperature gradients and hydrochemistry of surface water and groundwater were analysed in three different seasons. Depending on sitespecific conditions, distinct hydrogeological conditions were observed and both positive and negative effects on water quality were identified. Most concerning issues are the impact of anthropogenic ammonia, the mixing with ambient saline groundwater and the mobilisation of arsenic during the reductive dissolution of manganese-and iron-(hydr)oxides. Positive aspects are the dilution of contaminants during the mixing of waters from different sources, the sorption of arsenic, denitrification, and the precipitation of fluoride under favourable conditions.

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“…Many studies have indicated that groundwater flow does not get sufficient attention during the design of closed geothermal systems (Chiasson et al 2000;Diao et al 2004;Ferguson 2009;Haehnlein et al 2010;Molina-Giraldo et al 2011). Field studies using heat as a tracer under natural gradient conditions (Palmer et al 1992;Markle and Schincariol 2007) have shown that advection should be expected in some hydrogeological settings. Failure to account for advection can cause inefficiencies in system design and operation.…”

Section: Introductionmentioning

confidence: 99%

Screening for Heat Transport by Groundwater in Closed Geothermal Systems

Ferguson

2014

Groundwater

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Heat transfer due to groundwater flow can significantly affect closed geothermal systems. Here, a screening method is developed, based on Peclet numbers for these systems and Darcy's law. Conduction-only conditions should not be expected where specific discharges exceed 10(-8) m/s. Constraints on hydraulic gradients allow for preliminary screening for advection based on rock or soil types. Identification of materials with very low hydraulic conductivity, such as shale and intact igneous and metamorphic rock, allow for analysis with considering conduction only. Variability in known hydraulic conductivity allows for the possibility of advection in most other rocks and soil types. Further screening relies on refinement of estimates of hydraulic gradients and hydraulic conductivity through site investigations and modeling until the presence or absence of conduction can be confirmed.

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Thermal plume transport from sand and gravel pits – Potential thermal impacts on cool water streams

Cited by 37 publications

References 139 publications

Thermal damping and retardation in karst conduits

Thermal damping and retardation in karst conduits

Assessment of the potential for bank filtration in a water-stressed megacity (Delhi, India)

Screening for Heat Transport by Groundwater in Closed Geothermal Systems

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