The use of shallow geothermal energy increasingly receives attention as a suitable alternative to fossil fuel-based space heating and cooling, warm water provision, as well as for seasonal heat storage throughout Europe. With the advent of shallow geothermal energy use on large scales, a vivid discussion of potential ecological and economic impacts has arisen but actual field data are scarce. An intensive groundwater temperature-monitoring program over a period of 3 years with consecutive measurements was, therefore, initiated at a residential neighborhood in the city of Cologne, Germany, under intense shallow geothermal use. The aim of the monitoring program was to overcome the existing data scarcity by pinpointing the effects of the intensive thermal use of the subsurface on groundwater temperatures and to foster understanding of urban groundwater temperature evolution. Results show that even though energy demands of the individual houses and energy extraction rates of the shallow geothermal systems were comparably small in this case, the accumulation of shallow geothermal users had a measurable impact on overall groundwater temperatures.

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监视密集的浅层地热能使用对居民区地下水温度的影响

浅层地热能的使用作为基于化石燃料的空间供热和冷却，提供热水以及在整个欧洲进行季节性储热的一种合适替代方法越来越受到关注。随着大规模浅层地热能的出现，人们对潜在的生态和经济影响进行了生动的讨论，但实际的现场数据却很少。因此，在强烈的浅层地热利用下，在德国科隆市的一个居民区启动了一项为期3年，连续测量的强化地下水温度监测计划。监控程序的目的是通过查明地下大量集热利用对地下水温度的影响，克服现有的数据稀缺性，并增进对城市地下水温度演变的了解。结果表明，在这种情况下，即使单个房屋的能量需求和浅层地热系统的能量提取率相对较小，浅层地热用户的积累对整体地下水温度也有可观的影响。