Evaluation of sea level sensors at the Onsala space observatory

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dc.contributor.authorWahlbom, Jonas
dc.contributor.departmentChalmers tekniska högskola / Institutionen för rymd- och geovetenskapsv
dc.contributor.departmentChalmers University of Technology / Department of Earth and Space Sciencesen
dc.date.accessioned2019-07-03T13:48:46Z
dc.date.available2019-07-03T13:48:46Z
dc.date.issued2015
dc.description.abstractAbstract A rise of the global mean sea level by more than one metre by the year 2100 is expected. Measurements of the local sea level variations are important to understand the effect on a global scale. This report evaluate a new tide gauge installation at the Onsala Space Observatory with the aim to perform measurements at millimetre accuracy. The new tide gauge consist of two types of level sensors placed in a stilling well. A compact bubbler system and a pulsed radar where the compact bubbler system in the experimental setup consists of a total of five units of which two of the units are of a standard version with a nominal accuracy of 5 mm and three of them of an improved version (called USGS) with a nominal accuracy of 3 mm. Several indoor and field experiments were performed to evaluate the sensors in terms of accuracy, linearity, and stability. A new type of bubble chamber was constructed and compared to the original one. Systematic errors were found when the radar was placed in a narrow tube during the indoor experiments and tendencies of the same systematic error was found in the field experiment even though the tube in this case was significantly wider. A standard deviation of 2.5 mm was found in the differences between the USGS versions in the field environment and a standard deviation of 10 mm between the standard bubbler and the USGS version which was about the same standard deviation that was found between the USGS bubblers and the radar. An improvement was seen in the comparison between the standard bubbler unit and the radar were a standard deviation of 6.5 mm was found. The reason for the better agreement between the less accurate bubbler and the radar is believed to be the timing of the sampling units. The radar and standard bubbler uses the same logging unit and are therefore sampled at the same time. The comparison between the bubbler chambers did not result in any significant differences. This evaluation will serve as a valuable foundation to continued measurements and improvements of the new tide gauge.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/222971
dc.language.isoeng
dc.setspec.uppsokLifeEarthScience
dc.subjectHållbar utveckling
dc.subjectInnovation och entreprenörskap (nyttiggörande)
dc.subjectGeovetenskap och miljövetenskap
dc.subjectOceanografi, hydrologi, vattenresurser
dc.subjectOceanografi
dc.subjectAnnan teknik
dc.subjectSustainable Development
dc.subjectInnovation & Entrepreneurship
dc.subjectEarth and Related Environmental Sciences
dc.subjectOceanography, Hydrology, Water Resources
dc.subjectOceanography
dc.subjectOther Engineering and Technologies
dc.titleEvaluation of sea level sensors at the Onsala space observatory
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeCommunication Engineering (MPCOM), MSc
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