Author(s): M. Aragon; G. Martin-Llanes; C. Zarzuelo; A. Lopez-Ruiz; M. Ortega-Sanchez

Linked Author(s):

Keywords: Wave schematization; MORFAC; Input reduction; Morphodynamics

Abstract: Although significant progress has been made in modelling coastal morphodynamics in recent decades, computational times for real-world simulations of complex areas such as estuaries and river mouths are still very long. Taking into account the future impacts of climate change and the importance of long-term simulations, this work addresses the first steps necessary for the development of a comprehensive methodology to reduce computational times and optimise these simulations. For this purpose, an idealised estuary was defined and several simulations were carried out using the Delft3D model. The results have shown the difficulty of working with idealised geometries, as well as the sensitivity of the model to wave values (especially the incoming wave direction and wave height). Finally, the use of different values of the morphological acceleration factor (MORFAC) shows the importance of starting the simulation from a smoothed bathymetry close to an initial dynamic equilibrium. This work opens up promising lines of work, which will focus on the different methods of modelling the wave input reduction and the execution of real simulations of longer duration.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p0628-cd

Year: 2023