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The fate of sediment-bound contaminants: a case study of Vidy Bay (Lake Geneva, Switzerland)

Defense Thèse de doctorat : Univ. Genève, 2015 - Sc. 4760 - 2015/01/19
Abstract A multidisciplinary approach was used to investigate the transport and fate of sediment-bound contaminants in a polluted embayment of a mid-sized lake. This approach included the characterization of the colloidal suspension at the sediment-water interface, differentiation between vertical and lateral suspended sediment sources for the construction of a sedimentation component model, and the investigation of select hydrodynamic parameters. The nepheloid layer colloidal suspension was found to be relatively unstable, leading to a decrease in long-range transport capacity. Sedimentation rates and lateral advections were noted to increase with proximity to the sediment surface and also with proximity to shore. While, the hydrodynamic conditions in the nepheloid layer evidenced a decrease in velocity within the bay and the presence and persistence of a secondary gyre. Overall, it was found that contaminants located in Vidy Bay are likely to remain entrapped within the bay, leading to a continued accumulation of contaminants.
Keywords Contaminant-transportSediment focusingVidy BayLake GenevaHydrodynamicsBottom-boundary layerColloid
URN: urn:nbn:ch:unige-479852
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Thesis (21.3 MB) - public document Free access
Research groups ISE Eau
ISE Pôle Sciences
Limnology and Environmental Geology
Project FNS: PDFMP2−123034
(ISO format)
GRAHAM, Neil. The fate of sediment-bound contaminants: a case study of Vidy Bay (Lake Geneva, Switzerland). Université de Genève. Thèse, 2015. doi: 10.13097/archive-ouverte/unige:47985 https://archive-ouverte.unige.ch/unige:47985

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Deposited on : 2015-03-09

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