Long-term morphodynamics of a coupled shelf-shoreline system forced by waves and tides, a model approach
| Autor: | Nnafie, A., de Swart, H. E., Falqués, A., Calvete, D., Afd Marine and Atmospheric Research, Sub Physical Oceanography, Dep Natuurkunde, Marine and Atmospheric Research |
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| Přispěvatelé: | Afd Marine and Atmospheric Research, Sub Physical Oceanography, Dep Natuurkunde, Marine and Atmospheric Research, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. DF - Dinàmica de Fluids: formació d'estructures i aplicacions geofísiques |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Dunes
Sand dunes Sorra Seafloor landscape Morphodynamic Sand shoreline undulations Earth-Surface Processes Shore geography geography.geographical_feature_category Shoreline Física [Àrees temàtiques de la UPC] Wave angle Costa del mar ridges wave angle Sand ridges alignment Wave patterns Term (time) shoreline Oceanography Geophysics Seashore morphodynamic coupling Beach morphodynamics Geology |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Journal of Geophysical Research: Earth Surface, 126(12), 1. Wiley |
| ISSN: | 2169-9003 |
| Popis: | Sand ridges, with length scales of several km, are prominent features of the seafloor landscape of many sandy continental shelves. Knowledge about the extent to which these ridges influence the large-scale (i.e., decadal and kilometer scales) morphodynamic evolution of the adjacent shoreline and vice versa (shelf-shoreline morphodynamic coupling) is limited. The present work aims at quantifying this coupling by using a coupled nonlinear shelf-shoreline model forced by tides and different wave conditions. Model results show that the presence of sand ridges on the shelf creates longshore non-uniform wave patterns, which act as a forcing template for the morphodynamic development of the shoreline. The shelf-shoreline coupling primarily works one way, meaning that the morphodynamic evolution of the shelf affects the evolution of the shoreline. When wave propagation is predominantly aligned with the long axis of the shelf ridges, the forced shoreline undulations are so prominent, that they affect the shelf morphology (significant two-way coupling). Moreover, for those waves, the longshore spacing of the ridges is strongly imprinted on the shoreline morphology. Weaker shoreline undulations develop for waves that propagate more across the ridges and the weakest for time-varying wave conditions with large variability in their angles of propagation. Model results compare fairly well with observations. Physical mechanisms underlying the different morphodynamic responses of the coupled shelf-shoreline system to different wave conditions are also given. |
| Databáze: | OpenAIRE |
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