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Identifier 000404530
Title Morphodynamic analysis of coastal areas using numerical models and field data
Alternative Title Μορφοδυναμική ανάλυση παράκτιων ζωνών με χρήση αριθμητικών μοντέλων και δεδομένων πεδίου
Author Φοινικιανάκη, Βασιλεία
Thesis advisor Καμπάνης, Νικόλαος
Reviewer Δούγαλης, Βασίλειος
Ταρουδάκης, Μιχαήλ
Abstract Wind - induced waves are the dominant active phenomenon of the coastal area and have a large influence on the suspension and the transport of sediments in the nearshore area. The wave breaking with the associated wave - induced currents can bring relatively large quantities of sand into suspension which is then transported following the current direction. Although sediment in the nearshore area is moving constantly, transport is a phenomenon based mainly upon extreme events such as storm surges. In this study, the effect of a strong meteorological event, known as Meltemi, which took place from 24th to 30th July 2003 and monitored at Gouves beach (Poulos et al 2012, 2013) has been simulated and forecasted, using the Delft3D model. The concentration of the suspended sediment near the bed due to the combined effect of the wave - induced currents and the hy-drodynamic conditions caused by the storm is computed. In particular, the interaction between waves and currents obtained by the coupling of two models included in Delft3d, the Delft3d - FLOW, for the hydrodynamic computations and the sediment transport processes, and the Delft3d - WAVE, for the computation of the wave field. The two models have been coupled in an appropriate form through communicative artificial boundaries and well chosen boundary conditions, hierarchical grids (nested grids) and appropriate modeling of the outer problem. The results were, also, compared with measurements obtained during the event by Poulos et al. (2012, 2013). The results of the modeling fit well enough with the measured data. In particular, the model slightly overestimates the significant wave height and the current velocity in the nearshore area and the suspended sediment concentration near the bed at the observation points. However, generally the results of the simulation are very close to the measurements and the different bars formed by erosion and sedimentation are represented with enough accuracy.
Language English
Subject Coastal area
Hydrodynamics
Ιζηματομεταφορά
Υδροδυναμική
Issue date 2016-11-18
Collection   School/Department--School of Sciences and Engineering--Department of Mathematics--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/e/a/9/metadata-dlib-1482318318-570646-3387.tkl Bookmark and Share
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