Abstract Water resource management is a major concern in Marquenterre, a maritime plain located in the western part of the Somme department. Water management is particularly indispensable for protecting wetlands in Marquenterre, regulating water usage and avoiding saline intrusion into aquifers. Various approaches including geological modelling and hydrogeological and hydrogeochemical studies were used to prepare a conceptual model of the Marquenterre hydrosystem and to provide better water management in this sector. The conceptual model shows that the chalk aquifer and the various Quaternary deposit aquifers are in hydrogeological continuity. No seawater intrusion has been discovered in groundwater. Salinization discovered at depth is a result of the most recent marine transgressions. Finally, wetlands are primarily supplied by the chalk groundwater or by rainfall. The study results are used to direct policies for surface and subsurface water resource management. The proposed conceptual model may be useful for other coastal aquifers along the English Channel in order to address challenges of managing the chalk groundwater and backshore swamps.

Abstract Changes in society coupled with more ambitious environmental goals increase the need to make the benefits of geological knowledge visible. The Geological Survey of Sweden (SGU) is therefore evolving from its historical role as a ‘knowledge bank’ to become part of the integrated flow of public information. Three examples of the ongoing digital transformation, and how this will enable the SGU to contribute digital geological data for sustainable development, are: more automated data collection to monitor drinking water to be able to foresee water shortages; several new non-traditional marine projects, producing new information and recommendations for innovative measures to support Blue Growth, management and planning; an online virtual archive containing new data adding to our understanding of bedrock and mineral deposits, in turn leading to more efficient use of Sweden's mineral resources.