Sedimentation around Thyborøn Channel: Effects of Improving Storm Surge Levels in The Limfjord
Author
Petersen, Theis Buys
Term
4. term
Education
Publication year
2017
Submitted on
2017-06-07
Pages
116
Abstract
Stormfloder i Limfjorden er blevet højere, fordi Thyborøn Kanal, der forbinder fjorden med Nordsøen, har fået et større tværsnitsareal og derfor lukker mere vand ind under storme. Dette projekt vurderer, hvilke konsekvenser de foreslåede løsninger har for transporten af sand og silt (sediment): at forlænge en høfde og at bygge et dige med en sluse, som kan lukkes under storm. Vi gennemførte computersimuleringer med MIKE 21, et kystmodelleringsprogram, der kobler bølger, strøm og sedimenttransport, for både kraftige og mere milde storme udvalgt ud fra meteorologiske og oceanografiske data. Resultaterne viser, at en kombination af dige og høfde-forlængelse giver betydeligt bedre sedimentforhold end kun at forlænge høfden. Diget er dyrt, men vil også forbedre skibenes manøvredygtighed ved indsejlingen til Thyborøn Havn, og andet arbejde har vist, at det kan forbedre iltforholdene i Limfjorden.
Storm surges in the Danish Limfjord have increased because the Thyborøn Channel, which connects the fjord to the North Sea, now has a larger cross-section and lets more water in during storms. This project assesses how two proposed solutions would affect the movement of sand and silt (sediment): extending a groyne and building a dam with a sluice that can be closed during storms. We ran computer simulations with MIKE 21, a coastal modeling tool that couples waves, currents, and sediment transport, for both severe and milder storms selected from meteorological and oceanographic data. The results show that combining the dam with a groyne extension improves sediment conditions much more than extending the groyne alone. Although expensive, the dam would also improve ship maneuverability at the entrance to Thyborøn Harbour, and other work has shown it can improve oxygen levels in the Limfjord.
[This abstract was generated with the help of AI]
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