Airborne electromagnetic (AEM) is an efficient tool for mapping groundwater resources in sedimentary environments. AEM delivers a very high data coverage and results in high-resolution electrical images of the subsurface. In particular the time domain methods (TEM) are well suited for mapping o0f not only the salt-fresh water boundary in the coastal zone, but also the mixing of fresh-salt-water on the seaside. Even freshwater layers under several meters of brackish water can be mapped. Sufficient depth of investigation is obtained by time domain methods as they have a significant higher transmitter moment than frequency domain methods (FEM). We discuss the advantages of using airborne systems in coastal area for understanding of saltwater intrusion problems. Examples are shown from surveys at the vest cost of Holland and in Denmark.
Use of Airborne Electromagnetic for Efficient Mapping of Salt Water Intrusion and Outflow To the Sea, 2010