Assessment of sea-level variations along the Dutch coastline

Student Report (2020)
Author(s)

J.T. Arens (TU Delft - Civil Engineering & Geosciences)

Contributor(s)

REM Riva – Mentor (TU Delft - Physical and Space Geodesy)

D. B. Steffelbauer – Graduation committee member (TU Delft - Water Resources)

Faculty
Civil Engineering & Geosciences
Copyright
© 2020 J.T. Arens
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 J.T. Arens
Graduation Date
16-07-2020
Awarding Institution
Delft University of Technology
Programme
['Geoscience and Remote Sensing']
Faculty
Civil Engineering & Geosciences
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Abstract

Long-term sea level change and its spatial and temporal variability measured with tide gauge stations along the Dutch coast have been studied. This study investigates how time series length and modeling choices influence the adoption of a quadratic over a linear sea level model. We apply linear and quadratic models to corrected tide gauges, for differing model start years. Longer models show more consistent results between stations, with less inter-station variability and smaller uncertainties. This improvement of consistency diminishes when using time series longer than 40 years. We find indications of a break-point in trends in the period 1978-1998. Quadratic models result in minor but relevant acceleration for longer time series, but do not perform sufficiently for time series shorter than 20 years. Comparing model quality between linear and quadratic models generally indicate better performance of quadratic models, but results are not conclusive to justify model adoption. A station mean is less conclusive for quadratic models than for linear models and sensitive to choice of stations and model length. Keywords: mean sea level variability, sea level change, sea level acceleration, tide gauge records, Dutch coast

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