In the context of the design of the new sea lock in Zeebrugge, the Maritime Access Division has asked Flanders Hydraulics (FH) to determine the difference in density between the outer and inner harbours. This difference in density is important for the hydraulic design of the levelling system. A difference in density creates additional force on the ship in the whirlpool during levelling. A difference in density also results in less mixing and therefore a slower dissipation of the outflowing water in the outer and inner harbours. In studies conducted in the past, it was assumed that the difference in density is negligible because the level of the inner harbour is maintained by means of seawater. On its own initiative, FH launched project 17_004 to analyse the available density measurements. The results of this analysis were discussed with the Maritime Access Division. Based on the results, the Maritime Access Division asked FH to set up a continuous measurement campaign (minimum 6 months) to measure the density at 4 locations. From an initial analysis of this assignment by Hans Vereecken and Paul Vanderkimpen, it was decided to outsource the carrying out of the measurements and the delivery of a factual data report. FH will draw up specifications for carrying out the measurements and delivering a factual data report. FH will carry out a revision of the interim measurement results. After receiving the factual data report, FH will draw up a report discussing the results and providing conclusions and recommendations.
","AbstractOtherLang":"In kader van het ontwerp van de nieuwe zeesluis te Zeebrugge vraagt afdeling Maritieme Toegang aan Waterbouwkundig Laboratorium (WL) om het densiteitsverschil tussen de voor- en achterhaven te bepalen. Dit densiteitsverschil is belangrijk voor het hydraulisch ontwerp van het nivelleersysteem. Een densiteitsverschil zorgt namelijk voor een bijkomende kracht op het schip in de kolk tijdens nivelleren. Ook zorgt een densiteitsverschil voor een mindere menging en dus een tragere dissipatie van het uitstromende water in de voor- en achterhaven. Bij de in het verleden uitgevoerde studies werd aangenomen dat het densiteitsverschil verwaarloosbaar is omdat de achterhaven op peil wordt gehouden door middel van zeewater. Op eigen initiatief van WL werd divers project 17_004 opgestart om de beschikbare densiteitsmetingen te analyseren. De resultaten van deze analyse werden besproken met afdeling Maritieme Toegang. Op basis van de resultaten vraagt afdeling Maritieme Toegang aan WL om een continue meetcampagne (minimum 6 maand) op te zetten waarbij op 4 locaties de densiteit opgemeten wordt. Uit een eerste analyse van deze opdracht door Hans Vereecken en Paul Vanderkimpen werd besloten om het uitvoeren van de metingen en het opleveren van een factual data report uit te besteden. Het WL zal een bestek opstellen voor het uitvoeren van de metingen en het opleveren van een factual data rapport. WL zal een revisie uitvoeren van de tussentijdse meetresultaten. Na ontvangen van het factual data rapport zal WL een rapport opstellen waarin de resutlaten besproken worden en conclusies en aanbevelingen worden gegeven.
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