Optimalisatie van de onderzoeksmethode ter bepaling van het eolisch zandtransport op het strand van Oostende
Parmentier, L.; Verleye, J.-L. (2014). Optimalisatie van de onderzoeksmethode ter bepaling van het eolisch zandtransport op het strand van Oostende. MSc Thesis. KU Leuven. Faculteit Industriële Wetenschappen - Campus Oostende: Oostende. 103 pp.
In order to protect the coastline from a millennial storm the Government of Flanders conducts massive sand replenishments: vast amounts of sand are being supplied and deposed in front of the promenades on the beaches. Not only the waves, but also the wind makes sand disappear. Sand must regularly be added to guarantee the imposed coastal safety. A good monitoring of the beach profile is needed to plan and estimate the costs efficiently. Bathymetric surveys and air photogrammetry are methods used to see the evolution of the sand surface but unfortunately they are very expensive. An alternative to measure the amount of disappearing dry sand is to use aeolian sand transport measurements. During the winters of 2011-2012 and 2012-2013 transport measurements had been conducted within the framework of the Covimon-project. They were held on the Ostend beach in front of the Vives-builing. While measurements were being continued, the research method was optimized. A flowchart was created to describe the different influences on the aeolian sand transport, consequently making the research clear and reproducible for future researchers. As for the analysis of the collected sand, integration functions mentioned in the Dong research were evaluated. The function with the most constant range in correlation coefficient was chosen to be a standard in sand analysis. Next, the obtained sandflow was compared to a theoretically predicted flow, which was based on the measured wind velocities. Regarding the shear velocity, measurements confirmed the modified ‘law of the wake’ as the best approximation to the actual wind profile on the beach of Ostend, while for the critical shear velocity the theoretical approach from the research of Shao compared as best the measurements. Finally, from all measure events the theoretical model of Kawamura-White was found to be the best tool to predict the horizontal mass flux. Not only are the new configuration of sandcatchers and a higher measuring frequency necessary to provide more and accurate data, but also essential to implement the Shao-research integration curves. The configuration was subjected to numerous simulations to estimate the aerodynamical behaviour in terms of a temporary notion of its usability.
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