GRUNDFOS FOUNDATION RESEARCH SuperTEM - Next generation tools for groundwater characterization SuperTEM is an ambitious project with its sights set on addressing water quantity and quality issues facing many countries in the global south. The project seeks solutions to deter- mine groundwater levels and ground- water salinization without the need for expensive borehole installations. This will be accomplished through both permanent monitoring installations and novel drone-based systems. These goals will be achieved in partnership between Innovation Fund Denmark, Aarhus University, Aalborg University, Aarhus GeoSoftware, Rambøll, and the Grundfos Foundation. The project is led by the Hydro Geophysics Group (HGG) from Aarhus University. Over the past two decades, HGG has been actively developing Transient Figure 1 Electromagnetic (TEM) methodologies for detailed characterization of the subsurface. Although initially designed for mining applications, these methods can provide a wealth of information for hydrogeological models and water resource management if implemented correctly. HGG has recently developed the towed-TEM (tTEM) system, which permits highly productive subsurface mapping at unprecedented spatial scales. Some applications have includ- ed mapping groundwater salinization in Germany, Belgium, and the Nether- lands and aquifer mapping/borehole siting in Tanzania, South Africa, and Ethiopia (Figure 1). Additionally, the tTEM system has been adapted to water-borne surveys on rivers and lakes and surveys in polar regions. The tTEM system and an example of how 3D geological structures can be imaged as the system is driven, where the sub- surface lithological units can be differentiated by their contrasting electrical properties (colors). An example of a 3D tTEM model produced at a refugee camp in Tanzania. 46
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