Coastal erosion mitigation based on artificial nourishments and sand bypassing systems: Barra-Vagueira, Portugal

Coastal erosion mitigation based on artificial nourishments and sand bypassing systems: Barra-Vagueira, Portugal

Ferreira, M. (University of Aveiro, Portugal)
Coelho, C. (University of Aveiro, Portugal)
Silva, P.A. (University of Aveiro, Portugal)

2021-06-28

Barra-Vagueira coastal stretch, located downdrift of the Aveiro Harbour, NW coast of Portugal, is anerosion hotspot, presenting,in the last 50 years,erosion rates that reached 8m/year(Santoset al.,2014).Thiscoast is subject to a very energetic wave climate, inducing a net littoral transport from North to South that reaches valuesaround 106m3/year(Santos et al., 2014).Inthe last two decades, artificial nourishments have become the most common coastal erosion mitigation strategyat this site, being performed low-frequency shots,summing several million cubic meters of sediments(Pinto et al., 2020).In 2014, the PortugueseLittoral Working Group(Santos el al., 2014)has recommended artificial nourishments as the main strategy to reduce the deficit of sediments on the littoral driftand tocounter theshoreline retreat. The present study aimsto assessboth the impact of artificial nourishments performed at south of the Aveiro harbour inlet and sand bypassing systems at the inlet,on the morphological evolution of the stretch Barra-Vagueira, consideringtheir performance and longevity. The studywas performed through the application of the numerical modelsLTC-Long Term Configuration(Coelho, 2005), to simulate the shoreline evolution,and CS-Model(Larsonet al., 2016), tosimulate the cross-shore profile evolution, bothin a 30yearsperspective(2020-2050).Themethodology adopted in thisstudy and the assessed scenariosis primary described,in the next section. The following sections describe the calibration and validation of the models and the results of theimpact of the intervention scenarios in the morphology of the coastal stretch. Finally, the major conclusions are presented.

Long-term coastal change
Coastal nourishments and interventions

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