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The choice of a dumping area for dredged materials must be carried out taking into account the general movement of sediments in order to evaluate the risk they represent for the zone itself, the harbourworks and the coastal area* The use of radioactive tracers allows to study, in situ, transfer properties under tidal currents of fine sediments resuspended during the release, the distribution over the sea-bed of coarse particles and their future evolution due to currents and waves. In this way, parameters such as transport axis, mean velocity, dispersion, dilution and bed-load transport rates are determined- Four experiments which took place at OCTEVILLE, ANTIFER (FRANCE), SINGAPORE and ZEEBRUGGE (BELGIUM) during the ten past years illustrate the method.