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The si/ting-in of estuaries and harboUTs has important consequences for management. Si/tation problems are generally only studied from a sedimentological point ofview. Our aim is to bring a geotechnical dimension ta these phenomena, and tofind methodic approach including soli behaviour. Geotechnical investigations are a way of identifying the nature and behaviour affine sediments. Laboralory and in-situ experiments. however, are difficult with this kind of material. Stability studies show that the security ratio, regarding the circular rupture of slopes, is sufficient. Two original approaches, of cyclic mechanical stresses acting on the sediments, are suggested. ln thefirst, we show an increase of piewmetric level in tida! slopes. ln the second, tidai pore pressure can induce liquefaction phenomena in the first meter of submerged mud. An original apparatus is able ta regionalise the soft mud rhickness, and to predict areas of instability. Such a methodology will be useful for a knowledge of si/tation in other harbours.

Approche géomécanique des causes d'envasement. Application à la rade de Lorient