Hudson Beare, Classroom 4
Friday, July 31, 2015 - 12:45 to 14:00
Speaker: Jaime Arriaga
Title: Modelling of shoreline sand waves and its implication on the long-term fate of shore nourishments
Shoreline sand waves are dynamic coastal features expressed in the shoreline as rhythmic undulations with a wavelength of kilometres and a characteristic growth time of years. These large scale features are believed to be driven by an instability in the longshore transport in the presence of High-angle wave incidence (HAWI), this instability is caused by strong refraction effects and manifests as an unbalance between the wave height and wave angle at breaking. In order to predict its appearance and behaviour a simplified model approach is necessary due to computational costs and because more complicated models tend to have an important chaotic behaviour in the long run. A quasi two dimensional model is presented, which is able to reproduce and to capture the complex dynamics and growth of these features. A theoretical case is analysed where instability occurs and a real/pragmatic case where the diffusion of a mega-perturbation (Dutch coast) is analysed over 20 years.
Jaime Arriaga studied a bachelor in Mechanical Engineering in Mexico, afterwards made a master in Civil Engineering with an emphasis in the coastal area in the Engineering Institute of the UNAM (D.F., Mexico). Afterwards, he worked as a research assistant in the CINVESTAV. In this time his principal topic was the development of computer vision techniques to extract coastal features, in laboratory and in field. Now he is a PhD candidate in the Applied Physics department of the UPC, Barcelona, under the supervision of Prof. Albert Falques and Dr. Francesca Ribas. The PHD subject is the Shoreline Sand Waves: Modelling and observations. More recently he made an internship in the department of geophysical sciences in Utrecht University under the supervision of Prof. Gerben Ruessink. His main research topics of interest are the long-term evolution of coasts and the positive feedback between morphology and hydrodynamics at different scales (self-organization).