Sensitivity analysis of a morphodynamic modelling system applied to a coastal lagoon inlet |
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| Authors: | Sandra Plecha Paulo A Silva Nuno Vaz Xavier Bertin Anabela Oliveira André B Fortunato João M Dias |
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| Institution: | 1. CESAM, Departamento de Física, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
2. Departamento de Hidráulica e Ambiente, LNEC – Laboratório Nacional de Engenharia Civil, 1700-066, Lisbon, Portugal
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| Abstract: | This work investigates the recent morphological changes at the inlet of a complex coastal system (Ria de Aveiro lagoon, Portugal). This study was carried out using bathymetric data analysis and numerical simulations obtained with the
2DH morphodynamic modelling system MORSYS2D. The present simulations considered only tidal forcing, and a sensitivity analysis
was performed by tuning the formula used to compute the sediment transports. A non-uniform sediment grain size distribution
for the Ria de Aveiro inlet is considered in the numerical simulations, based on surveys performed in this area. The model results are analysed
to assess if they resemble the observed trends of erosion and deposition, as calculated from bathymetric data. A quantitative
analysis of the differences between the bathymetric changes obtained through surveys and the numerical results over a period
of 3 years considering different sediment transport formulations shows that the formulations of Ackers and White (1973) and Engelund and Hansen (1967) are the ones that best describe the morphodynamic changes driven by tides in the Ria de Aveiro inlet. |
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