Abstract:Groundwater discharge into lakes is an important component of the fluid and nutrient budgets, and a possible route for contaminant transport. However, groundwater flow beneath lakes is difficult to investigate due to the need for drilling deep boreholes. In 2012, a 2,000 m deep borehole was drilled in Lake Vättern, the second largest lake in Sweden. A continuous temperature profile was collected from the borehole. The geothermal gradient in the upper 180 m is highly non-linear, and not controlled by variabilit… Show more
“…They also used Ramey's equation to see if the vertical flow of warm fluid in the upper part can explain this discrepancy between measured and modeled geothermal temperature. They estimated the vertical flow velocity and concluded that this discrepancy can be explained by the infiltration of warm fluid transported from depth by fractures (Preto et al, 2019). In this work, the use of Hasan & Kabir's solution for converting temperature profile into flow profile is validated numerically (section numerical validation) and also experimentally by cross-checking the estimated flow rates with measured flow rates by a heat pulse flow meter.…”
Section: Flow Model From the Temperature Profile 21 State Of The Artmentioning
confidence: 94%
“…Using a laboratory prototype, they obtain very good agreement between flow rate measurements derived from temperature profiles using Ramey's model with imposed flow rates (Silva et al, 2019). Preto et al (2019) investigated the reason for nonlinearity in the recorded geothermal gradient in the upper part of a deep wellbore which could not be explained by the variability of measured thermal properties of sediments and rocks. They also used Ramey's equation to see if the vertical flow of warm fluid in the upper part can explain this discrepancy between measured and modeled geothermal temperature.…”
Section: Flow Model From the Temperature Profile 21 State Of The Artmentioning
“…They also used Ramey's equation to see if the vertical flow of warm fluid in the upper part can explain this discrepancy between measured and modeled geothermal temperature. They estimated the vertical flow velocity and concluded that this discrepancy can be explained by the infiltration of warm fluid transported from depth by fractures (Preto et al, 2019). In this work, the use of Hasan & Kabir's solution for converting temperature profile into flow profile is validated numerically (section numerical validation) and also experimentally by cross-checking the estimated flow rates with measured flow rates by a heat pulse flow meter.…”
Section: Flow Model From the Temperature Profile 21 State Of The Artmentioning
confidence: 94%
“…Using a laboratory prototype, they obtain very good agreement between flow rate measurements derived from temperature profiles using Ramey's model with imposed flow rates (Silva et al, 2019). Preto et al (2019) investigated the reason for nonlinearity in the recorded geothermal gradient in the upper part of a deep wellbore which could not be explained by the variability of measured thermal properties of sediments and rocks. They also used Ramey's equation to see if the vertical flow of warm fluid in the upper part can explain this discrepancy between measured and modeled geothermal temperature.…”
Section: Flow Model From the Temperature Profile 21 State Of The Artmentioning
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