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000015495 0247_ $$2DOI$$a10.1016/j.jhydrol.2010.12.007
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000015495 084__ $$2WoS$$aEngineering, Civil
000015495 084__ $$2WoS$$aGeosciences, Multidisciplinary
000015495 084__ $$2WoS$$aWater Resources
000015495 1001_ $$0P:(DE-HGF)0$$aEngeler, I.$$b0
000015495 245__ $$aThe importance of coupled modelling of variably saturated groundwater flow-heat transport for assessing river-aquifer interactions
000015495 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2011
000015495 300__ $$a
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000015495 440_0 $$03413$$aJournal of Hydrology$$v397$$x0022-1694$$y3
000015495 500__ $$3POF3_Assignment on 2016-02-29
000015495 500__ $$aThis work was partially supported by the EU 7th Framework Programme GENESIS Project No. 226536.
000015495 520__ $$aThis paper focuses on the role of heat transport in river-aquifer interactions for the study area Hardhof located in the Limmat valley within the city of Zurich (Switzerland). On site there are drinking water production facilities of Zurich water supply, which pump groundwater and infiltrate bank filtration water from river Limmat. The artificial recharge by basins and by wells creates a hydraulic barrier against the potentially contaminated groundwater flow from the city.A three-dimensional finite element model of the coupled variably saturated groundwater flow and heat transport was developed. The hydraulic conductivity of the aquifer and the leakage coefficient of the riverbed were calibrated for isothermal conditions by inverse modelling, using the pilot point method. River-aquifer interaction was modelled using a leakage concept. Coupling was considered by temperature-dependent values for hydraulic conductivity and for leakage coefficients. The quality of the coupled model was tested with the help of head and temperature measurements. Good correspondence between simulated and measured temperatures was found for the three pumping wells and seven piezometers. However, deviations were observed for one pumping well and two piezometers, which are situated in an area, where zones with important hydrogeological heterogeneity are expected. A comparison of simulation results with isothermal leakage coefficients with those of temperature-dependent leakage coefficients shows that the temperature dependence is able to reduce the head residuals close to the river by up to 30%. The largest improvements are found in the zone, where the river stage is considerably higher than the groundwater level, which is in correspondence with the expectations.Additional analyses also showed that the linear leakage concept cannot reproduce the seepage flux in a downstream section during flood events. It was found that infiltration is enhanced during flood events, which is attributed to additional infiltration areas. (C) 2010 Elsevier B.V. All rights reserved.
000015495 536__ $$0G:(DE-Juel1)FUEK407$$2G:(DE-HGF)$$aTerrestrische Umwelt$$cP24$$x0
000015495 536__ $$0G:(EU-Grant)226536$$aGENESIS - Groundwater and dependent Ecosystems: NEw Scientific basIS on climate change and land-use impacts for the update of the EU Groundwater Directive (226536)$$c226536$$fFP7-ENV-2008-1$$x1
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000015495 65320 $$2Author$$aGroundwater hydrology
000015495 65320 $$2Author$$aRiver-aquifer interaction
000015495 65320 $$2Author$$aGroundwater flow model
000015495 65320 $$2Author$$aLeakage coefficient
000015495 65320 $$2Author$$aTemporally variable leakage coefficient
000015495 65320 $$2Author$$aCoupled flow and heat transport
000015495 7001_ $$0P:(DE-Juel1)138662$$aHendricks-Franssen, H.J.$$b1$$uFZJ
000015495 7001_ $$0P:(DE-HGF)0$$aMuller, R.$$b2
000015495 7001_ $$0P:(DE-HGF)0$$aStauffer, F.$$b3
000015495 773__ $$0PERI:(DE-600)1473173-3$$a10.1016/j.jhydrol.2010.12.007$$gVol. 397$$q397$$tJournal of hydrology$$v397$$x0022-1694$$y2011
000015495 8567_ $$uhttp://dx.doi.org/10.1016/j.jhydrol.2010.12.007
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