Past, present and future of subsurface urban heat islands in China and Germany - implications for geothermal development

城市扎根于大地。这里是建筑物的地下室，基本的基础设施，重要的淡水和可再生能源资源。在这里，与周围未受干扰的条件相比，土壤和地下水的温度似乎大大增加，即所谓的地下城市热岛(SUHI)。更好地了解形成超高能效的机制以及不同区域超高能效之间的差异，对于今后制定积极主动的城市地面管理方法至关重要。本项目的重点是首次对中国和德国两个城市南京和科隆的超高吸收率进行比较。这两个研究小组在各自国家的SUHI研究方面都有丰富的经验，他们拥有来自过去土壤和地下水温度测量的宝贵数据库。其目的是用一个新的协作性测量计划来补充这些，并从过去和现在关于迄今未知的长期动态的SUHI特征中学习。通过野外和实验室的实验工作和土地利用瞬变过程中地温演变的数值模拟，将揭示超高压的未来演变。通过首先比较德国和中国城市的情况，然后在全球范围内选择更多的城市，将确定不同城市环境中的驱动因素。最终，在没有详细现场调查的情况下，也可以更可靠地预测其他城市未来的地下发展。

Cities have their roots in the ground. Here are the basements of buildings, essential infrastructure, vital freshwater and renewable energy resources. Here, soil and groundwater temperatures appear substantially increased when compared to ambient undisturbed conditions, i.e. the so-called subsurface urban heat islands (SUHIs). Better understanding of the mechanisms forming SUHIs and of the differences between those in different regions will be crucial for developing recipes for proactive urban ground management in the future. The focus of this project is, for the first time, on the comparison of SUHIs in two Chinese and German cities, Nanjing and Cologne. Both research groups have substantial experience in SUHI research in their countries, and they have precious databases from past measurements of soil and groundwater temperature. The purpose is to complement these with a new collaborative measurement program, and to learn from past and present SUHI characteristics about the so far unknown long-term dynamics. By field and laboratory-based experimental work and numerical simulation of ground temperature evolution with transient land use development, the future evolution of SUHIs will be revealed. By comparing the conditions first in German and Chinese cities, and then in selected further cities worldwide, the driving factors in different urban environments will be identified. Ultimately, more reliable predictions of the future subsurface development also in other cities without detailed site investigation is facilitated.