Details

Part of the sediment dredged from the port of Harlingen will be disposed on a new location, in order to promote accretion and development of salt marshes near KoehooI. In order to predict the effectiveness of disposal on this new location, a tracer experiment was carried out. Two types of tracer were used: one dispersed from an existing disposal location, and another dispersed from the proposed location. Samples were collected from the area of interest (close to Koehooi) and analysed for tracer content. This revealed that approximately 80% of sediment released from the proposed location deposits in the area of interest, whereas 20% of sediment released from the existing location deposits in the area of interest. Results further suggest that the fate of disposed sediment on the short term (days-weeks) is determined by the phasing of disposal within in the tidal cycle (disposal during ebb, flood, high water or low water) but less important over longer periods (weeks - months).