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22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and PerspectivesAN INNOVATIVE APPROACH FOR SUSTAINABLE GROUNDWATER EXTRACTIONIN NATURE RESERVES THREATENED BY SALTWATER INTRUSIONJohannes Michaelsen 1 ; Soeren Kathmann 1 ; Kai Radmann 1 ; Caroline Schlegel 1jmichaelsen@consulaqua.de1 CONSULAQUA HamburgCONSULAQUA Hamburg, Ausschlaeger Elbdeich 2, 20539 Hamburg GermanyAbstract. The water supply of the North Sea islands has relied in the past on the exploitationof the freshwater lenses. As a result of an increasing demand during the last decades, saltwater intrusion has become a more severe problem. Geologists and engineers often succeed inthe application of effective practices in the prevention of saltwater intrusion. These aresometimes inhibited by environmental protection interest groups. The ecologists’ concern isthat critical groundwater-dependent ecosystems may be damaged by lowering of groundwaterdrawdown. The use of alternative water resources will multiply the price of tap water. Thespecification of alternative water supply systems, e.g., desalination or long distance transportby pipelines often has decisive negative effects on the environment as well. Hydrogeologistsand ecologists should investigate in detailed groundwater dependent ecosystems withininterdisciplinary projects in order to develop new concepts for sustainable groundwaterexploitation. The water extraction regime should be dynamically adapted to localmeteorological and ecological constrains on one side and public water demand on the otherside.Keywords: groundwaterdependent ecosystem, soil hydrology, islands, dunes115