SEDIMENTOLOGICAL IMPACT OF ARTIFICIAL ISLANDS AND PITS, MEASURED WITHSEDIMENT TRAPS

Sediment traps have been applied in the Oresund Sound in order to inve stigate the possible sedimentological effect of the construction of a fixed link between Denmark and Sweden during the period 1995-2000. Res ults from measurements made around test islands and test pits carried out during March 1993 are presented. It was impossible to separate the sedimentological impact of the test islands from the background sedim entation during both calm and windy periods due to its small magnitude compared to the natural sediment transport. The sedimentation in two test pits was measured with sediment traps and compared favourably wit h observations of sedimentation on the pit bottoms, indicating that th e traps give a good measure of how fast a tunnel trench, pits for brid ge piers and pylons, etc, are refilled with sediments after excavation .