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WP 1.4

Development of concepts for the exploration of storage sites and of monitoring strategies for an optimised thermal use of the shallow subsurface

 

An adequate exploration prior to the installation of shallow subsurface heat storage systems is essential to ensure their economic dimensioning as well as efficient and sustainable operation. This is especially true in urban areas. In addition, potential long-term effects of the use of shallow subsurface heat storage on groundwater temperature and chemical regimes have not yet been thoroughly investigated. In contrast to the limited spatial information collected during conventional drilling, the use of non- and minimally invasive geophysical methods (e.g. surface geophysics, borehole installations and direct push technology) provides sufficient information for the characterization of heterogeneous sedimentary deposits.

While the use of borehole measurements is a common practice in the exploration phase of large scale applications, the use of spatially integrated measuring methods (e.g. geoelectrics) in combination with high resolution vertical measurements remains an exception - although this combined approach can highly contribute towards an optimized dimensioning of heat storage fields.

Therefore, the main objective of this work package is the development of tailored geophysical exploration and monitoring concepts for shallow subsurface heat storage systems under special consideration of urban areas. Results of this work package will contribute to the development of guidelines.