Abstract
Presented is a simple mass-balance approach to evaluate the efficiency of dredged sedimentation traps for the elimination of suspended matter and phosphorus (P). Sediment parameters inside and outside the traps were analysed from three river mouths in northern Germany. In the pits, a fine-grained sediment richer in iron, P, and organic content than the surrounding sediment was trapped. However, the sediment P fractionation carried out indicates that no increased release of P is expected, which is not different from those found in natural beds. Hence, these traps are a practicable measure of reducing riverine seston and P discharges to the interior coastal waters and consequently to the open Baltic. *** DIRECT SUPPORT *** A01BY073 00003
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