dc.rights.license | CC-BY-NC-ND | |
dc.contributor.advisor | Donker, J.J.A | |
dc.contributor.advisor | Reussink, B.G. | |
dc.contributor.author | Beem, J.B. van | |
dc.date.accessioned | 2019-04-23T17:00:50Z | |
dc.date.available | 2019-04-23T17:00:50Z | |
dc.date.issued | 2018 | |
dc.identifier.uri | https://studenttheses.uu.nl/handle/20.500.12932/32561 | |
dc.description.abstract | In order to further increase the knowledge about the transformation of wind patterns on the
supra and intertidal beach during onshore wind events a field experiment was launched during
October 2017 on the beach near Egmond aan Zee. Part of this field experiment was measuring
wind on different (cross shore) locations on the beach using four mobile sonic anemometers
capable of making three dimensional measurements of wind vectors at a rate of 10hz. Based on
the data gathered in the field experiment the following research question is answered: “How do
regional wind patterns compare to local wind patterns on the beach during different on-shore
wind events?” Additional knowledge about onshore wind patterns is wanted in order to further
improve the predictions of dune development thereby enhancing the water safety of the
hinterland. The fieldwork campaign carried out in this research was highly successful due to
almost perfect conditions. After the dataset gathered during the experiment was analyzed, it
became clear that the wind decreases across the width of the beach during onshore wind
events. The amount of decrease is highly dependent on the incident wind direction. Whereas
onshore wind events show a potential decrease upwards of 60%, oblique onshore and oblique
alongshore show a maximum decrease of 45% and 23% respectively. It has been observed that
the turbulent kinetic energy remains constant across the beach. The wind direction changes
across the beach and tend to become more dune parallel when the dune foot is approached.
Compared to regional wind speed measurements, measurements performed at the back of the
beach show a decrease of 48%. Almost half of this decrease however is due to the logarithmic
vertical velocity profile of the wind. Furthermore, it has been established that the regional wind
direction measurements could closely reassemble local wind directions when a fifth order
polynomial formula is applied on the regional measurements. The new insights regarding the
decrease in wind speed over distance further complicates the already complex cosine effect.
Additional research regarding the interaction of the cosine effect with the new results of this
study therefor is recommended. | |
dc.description.sponsorship | Utrecht University | |
dc.format.extent | 2979125 | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | |
dc.title | Aeolex II - Aeolian processes on a natural beach, spatial variability in wind
characteristics | |
dc.type.content | Master Thesis | |
dc.rights.accessrights | Open Access | |
dc.subject.keywords | Aeolex II, Egmond aan Zee, Beach, wind, windpatterns, foredune, wind patterns, wind charasteristics, regional wind, local wind. | |
dc.subject.courseuu | Earth Surface and Water | |