Current coastal protection strategy in Portugal defines beach and shoreface nourishment as a vali... more Current coastal protection strategy in Portugal defines beach and shoreface nourishment as a valid measure to mitigate coastal erosion in some erosional hot-spots, being considered as an adaptation measure under the present climate change scenario, including the impacts of sea level rise. However, scant objective data on shoreface nourishments are available to evaluate performance of this type of intervention in mitigating beach erosion and managing coast risk. We present the first monitoring results of a ≈2.4 × 106 m3 shoreface nourishment on the Aveiro coast (Costa Nova—Ílhavo), the largest until now in Portugal, focusing on its morphological development, impacts on adjacent beaches due to alongshore spreading and cross-shore redistribution, and contribution to the sediment budget of the nourished sediment cell. The analyses are based on high-resolution coastal monitoring data, provided by the Portuguese COaStal MOnitoring Program (COSMO). A Multiple Monitoring Cell (MMC) approach...
In Aveiro (NW coast of Portugal), a coastal monitoring programme was carried out in sequence of a... more In Aveiro (NW coast of Portugal), a coastal monitoring programme was carried out in sequence of a shoreface nourishment intervention (over than 2 M m3) performed in 2020. In this programme, almost one year of biweekly subaerial topographies and quarterly bathymetric surveys have been collected along a 10 km coastal stretch between June 2020 and June 2021. In this study, topographic and bathymetric surveys were analysed to assess the expectation that if the shoreface nourishment is located in sufficiently shallow water depths, its landward movement will feed adjacent beaches and, consequently, increase the subaerial beach volume. Results show that the subaerial beach volume is well correlated with the 1.05 m (above MSL) isoline displacement through time. While the seaward limit of the shoreface nourishment moved landwards about 200 m, the shoreline proxy (isoline of 1.05 m) displayed a maximum seaward displacement of 60 m. The displacement of the shoreline proxy was highly variable i...
Table S1—Surface samples of FF borrow area: Concentrations of As, Cd, Cr, Cu, Ni, Pb, Zn and Hg (... more Table S1—Surface samples of FF borrow area: Concentrations of As, Cd, Cr, Cu, Ni, Pb, Zn and Hg (mg kg<sup>-1</sup>) and PCBs, PAHs e HCB (ng g<sup>-1</sup>). Classification according to the Portuguese legislation (Ordinance 1450/2007).
Abstract A compilation of all beach nourishment projects conducted along mainland Portugal was ma... more Abstract A compilation of all beach nourishment projects conducted along mainland Portugal was made, totalizing 134 interventions up until 2017. The objectives, type of deposition, borrow area, responsible entities and geographic distribution of each intervention were identified and are herein briefly presented and discussed. Beach nourishments were mostly carried out to improve the stability of the coastline, as a mitigation measure for coastal erosion, and to increase beach width for recreational use, as a tool for adding value to the coast. Operations concentrated in: 1) urban areas where erosion can pose risks to people and assets, 2) close to river mouth/inlets where port structures are established, and 3) touristic areas with high recreational value. Port Administrations contributed most (in number and volume) for the nourishment operations (62% of all operations), favouring the placement of the dredged sediments on the nearshore, and, more recently, providing the sediment of opportunity for subaerial beach fills and/or dune reinforcement carried out in cooperation with the State Environment/Coastal Authorities. The increase in the number of beach nourishments was accompanied by a decrease in the number of "hard" coastal structures, concurring to the optimization of an integrated coastal sediment management policy, in a clear paradigm shift that started in the 90s in regard to the coastal protection/defence strategy. There is a growing awareness regarding the beneficial use of sediments dredged by Ports to counter the coastal sediment deficit, making coastal nourishments mainly supply-driven in mainland Portugal. Beach nourishment practice has evolved to be the major contributor to a regional and national-scale coastal protection strategy focused on coastal sediment management.
Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and t... more Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and trade; the King [D. Dinis] did not wish it to be empty and useless [...] and issued a settlement permit for thirty inhabitants, who would have six fishing caravels and hunt [...] This village, called Paredes, kept growing and growing until the time of King D. Manuel, when neighboring sands carried by the winds coming from all directions covered the houses and silted the port in such a way that it became uninhabited [...] This way does the weather change and, with it, all things, even ruining villages. Francisco Brandão (1650)
COASTAL GEOMORPHOLOGICAL AND ENVIRONMENTAL CHANGES AS DRIVERS OF HISTORICAL SHIFTS IN MARITIME ACTIVITIES, 2019
Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and t... more Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and trade; the King [D. Dinis] did not wish it to be empty and useless […] and issued a settlement permit for thirty inhabitants, who would have six fishing caravels and hunt […] This village, called Paredes, kept growing and growing until the time of King D. Manuel, when neighboring sands carried by the winds coming from all directions covered the houses and silted the port in such a way that it became uninhabited […] This way does the weather change and, with it, all things, even ruining villages. Francisco Brandão (1650)
Current coastal protection strategy in Portugal defines beach and shoreface nourishment as a vali... more Current coastal protection strategy in Portugal defines beach and shoreface nourishment as a valid measure to mitigate coastal erosion in some erosional hot-spots, being considered as an adaptation measure under the present climate change scenario, including the impacts of sea level rise. However, scant objective data on shoreface nourishments are available to evaluate performance of this type of intervention in mitigating beach erosion and managing coast risk. We present the first monitoring results of a ≈2.4 × 106 m3 shoreface nourishment on the Aveiro coast (Costa Nova—Ílhavo), the largest until now in Portugal, focusing on its morphological development, impacts on adjacent beaches due to alongshore spreading and cross-shore redistribution, and contribution to the sediment budget of the nourished sediment cell. The analyses are based on high-resolution coastal monitoring data, provided by the Portuguese COaStal MOnitoring Program (COSMO). A Multiple Monitoring Cell (MMC) approach...
In Aveiro (NW coast of Portugal), a coastal monitoring programme was carried out in sequence of a... more In Aveiro (NW coast of Portugal), a coastal monitoring programme was carried out in sequence of a shoreface nourishment intervention (over than 2 M m3) performed in 2020. In this programme, almost one year of biweekly subaerial topographies and quarterly bathymetric surveys have been collected along a 10 km coastal stretch between June 2020 and June 2021. In this study, topographic and bathymetric surveys were analysed to assess the expectation that if the shoreface nourishment is located in sufficiently shallow water depths, its landward movement will feed adjacent beaches and, consequently, increase the subaerial beach volume. Results show that the subaerial beach volume is well correlated with the 1.05 m (above MSL) isoline displacement through time. While the seaward limit of the shoreface nourishment moved landwards about 200 m, the shoreline proxy (isoline of 1.05 m) displayed a maximum seaward displacement of 60 m. The displacement of the shoreline proxy was highly variable i...
Table S1—Surface samples of FF borrow area: Concentrations of As, Cd, Cr, Cu, Ni, Pb, Zn and Hg (... more Table S1—Surface samples of FF borrow area: Concentrations of As, Cd, Cr, Cu, Ni, Pb, Zn and Hg (mg kg<sup>-1</sup>) and PCBs, PAHs e HCB (ng g<sup>-1</sup>). Classification according to the Portuguese legislation (Ordinance 1450/2007).
Abstract A compilation of all beach nourishment projects conducted along mainland Portugal was ma... more Abstract A compilation of all beach nourishment projects conducted along mainland Portugal was made, totalizing 134 interventions up until 2017. The objectives, type of deposition, borrow area, responsible entities and geographic distribution of each intervention were identified and are herein briefly presented and discussed. Beach nourishments were mostly carried out to improve the stability of the coastline, as a mitigation measure for coastal erosion, and to increase beach width for recreational use, as a tool for adding value to the coast. Operations concentrated in: 1) urban areas where erosion can pose risks to people and assets, 2) close to river mouth/inlets where port structures are established, and 3) touristic areas with high recreational value. Port Administrations contributed most (in number and volume) for the nourishment operations (62% of all operations), favouring the placement of the dredged sediments on the nearshore, and, more recently, providing the sediment of opportunity for subaerial beach fills and/or dune reinforcement carried out in cooperation with the State Environment/Coastal Authorities. The increase in the number of beach nourishments was accompanied by a decrease in the number of "hard" coastal structures, concurring to the optimization of an integrated coastal sediment management policy, in a clear paradigm shift that started in the 90s in regard to the coastal protection/defence strategy. There is a growing awareness regarding the beneficial use of sediments dredged by Ports to counter the coastal sediment deficit, making coastal nourishments mainly supply-driven in mainland Portugal. Beach nourishment practice has evolved to be the major contributor to a regional and national-scale coastal protection strategy focused on coastal sediment management.
Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and t... more Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and trade; the King [D. Dinis] did not wish it to be empty and useless [...] and issued a settlement permit for thirty inhabitants, who would have six fishing caravels and hunt [...] This village, called Paredes, kept growing and growing until the time of King D. Manuel, when neighboring sands carried by the winds coming from all directions covered the houses and silted the port in such a way that it became uninhabited [...] This way does the weather change and, with it, all things, even ruining villages. Francisco Brandão (1650)
COASTAL GEOMORPHOLOGICAL AND ENVIRONMENTAL CHANGES AS DRIVERS OF HISTORICAL SHIFTS IN MARITIME ACTIVITIES, 2019
Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and t... more Two leagues north from the village of Pederneira lay a big and well-suited port for fishing and trade; the King [D. Dinis] did not wish it to be empty and useless […] and issued a settlement permit for thirty inhabitants, who would have six fishing caravels and hunt […] This village, called Paredes, kept growing and growing until the time of King D. Manuel, when neighboring sands carried by the winds coming from all directions covered the houses and silted the port in such a way that it became uninhabited […] This way does the weather change and, with it, all things, even ruining villages. Francisco Brandão (1650)
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