Mapping sediment accumulation rate by using volume magnetic susceptibility core correlation in a contaminated bay (Lake Geneva, Switzerland)

Article Article scientifique Article Mapping sediment accumulation rate by using volume magnetic susceptibility core correlation in a contaminated bay (Lake Geneva, Switzerland) eng 2003 author Loizeau Jean-Luc 0000-0002-0611-0388 23020 author Roze Stéphane Yannick 61627 author Peytremann Christophe 84880 author Monna Fabrice 503812 author Dominik Janusz 22088 73-96 10.1007/978-3-0348-7992-7_9 0012-9402 The Bay of Vidy is the most contaminated area of Lake Geneva: contamination is caused by the effluent of the sewage treatment plant (STP) of the City of Lausanne. The implementation of a chemical stage in the treatment plant to remove phosphorus using FeCl(3) in 1971 is indirectly recorded in the take sediments by a strong and sharp increase in the volume magnetic susceptibility (VMS) signal. A total of 43 sediment cores have been retrieved and measured for VMS. The synchronism of the VMS signal increase and its relation to the implementation of the P-removal stage in the STP has been shown in seven (137)Cs-dated sediment cores. The VMS signal has been used to date by stratigraphic correlation all of the 43 sediment cores and map the three-dimensional distribution of contaminated sediments. Over an area of 0.5 km(2) the sediment accumulation rates vary from 2.8 cm/y close to the effluent mouth, to 0.3 cm/y 1 km away. The total mass of contaminated sediments is estimated to 274,000 tons. 137Cs dating Core correlation Lake sediment Sewage treatment plant Magnetic susceptibility 3-D Dewey 550 41 Département F.-A. Forel des sciences de l'environnement et de l'eau 153 false Eclogae geologicae Helveticae 96 S bf6c1a71-8083-4b12-bdd8-85725ddfa027 Article (Published version) Public Loizeau et al 2003 Eclogae geol Helv.pdf 740610 application/pdf openAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département F.-A. Forel des sciences de l'environnement et de l'eau

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Mapping sediment accumulation rate by using volume magnetic susceptibility core correlation in a contaminated bay (Lake Geneva, Switzerland)	Eclogae geologicae Helveticae			2003	793	287

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Roze, Stéphane Yannick