Department of Earth Sciences, University of Zaragoza, c/Pedro Cerbuna 12, 50009 Zaragoza, Spain; GHS, Institute of Environmental Assessment & Water Research (IDAEA), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.
GHS, Institute of Environmental Assessment & Water Research (IDAEA), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.
Sci Total Environ. 2014 Jul 1;485-486:575-587. doi: 10.1016/j.scitotenv.2014.03.123. Epub 2014 Apr 17.
The extensive implementation of ground source heat pumps in urban aquifers is an important issue related to groundwater quality and the future economic feasibility of existent geothermal installations. Although many cities are in the immediate vicinity of large rivers, little is known about the thermal river-groundwater interaction at a kilometric-scale. The aim of this work is to evaluate the thermal impact of river water recharges induced by flood events into an urban alluvial aquifer anthropogenically influenced by geothermal exploitations. The present thermal state of an urban aquifer at a regional scale, including 27 groundwater heat pump installations, has been evaluated. The thermal impacts of these installations in the aquifer together with the thermal impacts from "cold" winter floods have also been spatially and temporally evaluated to ensure better geothermal management of the aquifer. The results showed a variable direct thermal impact from 0 to 6 °C depending on the groundwater-surface water interaction along the river trajectory. The thermal plumes far away from the riverbed also present minor indirect thermal impacts due to hydraulic gradient variations.
在城市含水层中广泛应用地源热泵是一个与地下水质量和现有地热装置未来经济可行性相关的重要问题。尽管许多城市都靠近大河，但对于千米尺度上的河流-地下水相互作用却知之甚少。本工作旨在评估洪水事件引起的河水补给对受地热开采影响的城市冲积含水层的热影响。评估了包括 27 个地下水热泵装置在内的区域尺度城市含水层的当前热状态，还对这些装置在含水层中的热影响以及“寒冷”冬季洪水的热影响进行了时空评估，以确保更好地管理含水层中的地热。结果表明，根据河流轨迹上的地下-地表水相互作用，直接热影响从 0 到 6°C 不等。远离河床的热羽流也由于水力梯度变化而产生较小的间接热影响。
