Numerical evaluation and optimization of depth-oriented temperature measurement for the investigation of thermal influences on groundwater resources

High-resolution depth-oriented temperature measurements havebeen introduced to investigate a groundwater body in the urban area of Basel. In total, four devices were installed with up to 16 sensors- located in both the saturated and unsaturated zone. Measurements were performed over a period of 4 years and provide sufficient data to set up and calibrate high-resolution numerical local heat-transport models. Calibration was performed for the saturated and unsaturated zone, respectively. Model results show that although depth-oriented measurements provide valuable insights into local thermal processes, the identification of governing and impacting factors strongly depends on appropriate positioning of the measurement device. High-resolution depth-oriented temperature measurements havebeen introduced to investigate a groundwater body in the urban area of Basel. In total, four devices were installed with up to 16 sensors- located in both the saturated and unsaturated zone. Measurements were performed over a period of 4 years and provide sufficient data to set up and calibrate high-resolution numerical local heat-transport models. Calibration was performed for the saturated and unsaturated zone, respectively. Model results show that although depth-oriented measurements provide valuable insights into local thermal processes, the identification of governing and impacting factors strongly depends on appropriate positioning of the measurement device. Hydrogeologie der Nordwestschweiz, Grundwasser in Basel