Estimating water levels in Ringkøbing Fjord using the Manning-Gaukler formula and Wind Setup
Author
Hove, Peter Aksel Kristensen
Term
4. term
Education
Publication year
2026
Submitted on
2026-06-03
Pages
15
Abstract
Ringkøbing Fjord is a shallow lagoon on Denmark’s west coast, where outflow to the North Sea is controlled by a sluice in Hvide Sande. This project examines how wind setup (wind pushing water and raising the water level) affects calculations of the fjord’s water level. We combine wind setup with the DCA Flow formula and the Manning–Gaukler formula (a standard hydraulic formula for open-channel flow) to estimate water levels. To improve accuracy, we use stochastic gradient descent, an optimization method, to tune domain-specific constants in the formulas. The results show a slight improvement of about 1% in the estimated water levels when wind setup is included, compared with estimates that ignore wind setup.
Ringkøbing Fjord er en lavvandet fjord på den jyske vestkyst. Udløbet til Nordsøen styres af en sluse i Hvide Sande. Dette projekt undersøger, hvordan vindopstuvning (når vinden presser vandet og hæver vandstanden) påvirker beregninger af vandstanden i fjorden. Vi kombinerer vindopstuvning med DCA Flow-formlen og Manning–Gaukler-formlen (en standard hydraulisk formel til strømning) for at estimere vandstanden. For at forbedre modellernes træfsikkerhed bruger vi stochastic gradient descent, en optimeringsmetode, til at finde passende områdespecifikke konstanter i formlerne. Resultaterne viser en lille forbedring på cirka 1 % i de estimerede vandstande, når vindopstuvning medtages, sammenlignet med beregninger uden vindopstuvning.
[This apstract has been rewritten with the help of AI based on the project's original abstract]
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