Within the Upper Zeeschelde navigability project (project number 13_131), historical high and low water levels (from 1930 onwards) were digitised for five tide gauges in the Upper Zeeschelde. This analysis is an extension of an earlier report for the Lower Zeeschelde (00-035 - V&T DR6). However, within this last study, use was made of values from the 10-year overviews and therefore only a limited number of parameters could be analysed (e.g. the duration of the fall and rise was only available in the last few decades). However, to gain further insight into the historical evolution of the tide in the entire Scheldt estuary, it is necessary to further expand this digitisation so that all parameters can be analysed. The first phase of the requested project will focus on the high and low tide levels for five ‘mother’ stations within the main tide stations that will be digitised from 1880 onwards. In the second phase, the remaining main tide stations will be digitised, not only those in the Zeeschelde but also those in the tributaries. After the digitisation exercise, the characteristic tidal parameters (high and low water levels, rise duration, fall duration, time delay relative to Vlissingen/Antwerp, etc.) will be derived and the extent to which these parameters have changed historically will be examined. The expected change in tidal parameters over time is then analysed in relation to a number of explanatory parameters. We expect morphological changes in the estuary to have a significant influence on this. This analysis should improve our understanding of how the system functions and enable us to better advise managers on the challenges of the future, including rising sea levels and the risk of regime shift.
","AbstractOtherLang":"Binnen het project bevaarbaarheid Boven Zeeschelde (projectnummer 13_131) werden historische hoog- en laagwaterstanden (vanaf 1930) gedigitaliseerd voor een 5-tal getijposten in de Boven Zeeschelde. Deze analyse is een uitbreiding op een eerder rapport voor de Beneden-Zeeschelde (00-035 - V&T DR6). Echter binnen deze laatste studie is gebruik gemaakt van waarden uit de 10-jarige overzichten en daardoor konden slechts een beperkt aantal parameters geanalyseerd worden (e.g. Duur daling en stijging was slechts de laatste decennia beschikbaar). Om verder inzicht te krijgen in de historische evolutie van het getij in het volledige Schelde estuarium is het echter noodzakelijk om deze digitalisatie verder uit te breiden zodat alle parameters geanalyseerd kunnen worden. \r\n\r\nBinnen het aangevraagde project zal in de eerste fase gefocust worden op de hoog- en laagwaterstanden voor een 5-tal “moeder”-posten binnen de hoofd-getijposten die gedigitaliseerd zullen worden vanaf 1880. In de 2e fase worden de overige hoofd-getijposten gedigitaliseerd die niet enkel gelegen zijn in de Zeeschelde maar ook in de bijrivieren. \r\nNa de digitalisatieoefening worden de karakteristieke getijparameters (hoog- en laagwaterstanden, stijgingsduur, dalingsduur, tijdsvertraging t.o.v. Vlissingen/Antwerpen, etc.) afgeleid en wordt gekeken in welke mate deze parameters historisch zijn gewijzigd. De te verwachten wijziging in getijparameters doorheen de tijd wordt vervolgens geanalyseerd in functie van een aantal verklarende parameters. We verwachten hierbij dat morfologische wijzingen in het estuarium een belangrijk invloed hebben. Deze analyse moet toelaten het inzicht in het systeemfunctioneren te verbeteren, alsook de beheerders beter te kunnen adviseren in de uitdagingen voor de toekomst, waaronder de zeespiegelstijging en het risico op regime shift.","DateLastModified":{"date":"2025-06-06 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