This work belongs to a project for the use of geophysical techniques in the strand zone (i.e. the area situated between the low and the high tide, by extension in our work, the area between the lower level of sea and the back dune). A large part of French coasts are constituted of beach dunes which are moved by winds. The main problems of coast management are water resources management due to the saline intrusion, bedrock mapping for civil engineering problems and dune stabilization. For structural geology, usual geophysical techniques are seismic, but which is expensive. Saline intrusion are detected with electrical sounding, but is a punctual technique. The aim was to use low cost continuous methods. We tested a methodology coupling continuous electromagnetic techniques and electrical soundings. We supposed that this combination of techniques could answer to the problem of bedrock mapping and water levels detection.


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