Encontrados 5 documentos, a visualizar página 1 de 1
Retrieval of nearshore bathymetry from Sentinel-1 SAR data in high energetic wa...
Santos, Diogo; Fernández-Fernández, Sandra; Abreu, Tiago; Silva, Paulo A.; Baptista, PauloThe ability to derive bathymetry using remote sensing techniques enables rapid and cost-efficient mapping of large coastal areas. This contribution focuses on the application of both fast Fourier transform (FFT) and wavelet spectral analysis to obtain satellite-derived bathymetry maps of the nearshore, from freely available and easily accessible Sentinel-1 synthetic aperture radar (SAR) data with 10 m pixel res...
Analysis of Nonlinear Wave Parameters on Ofir Sandy Beach (NW Portugal)
Abreu, Tiago; Silva, Paulo A.; Baptista, Paulo; Pais-Barbosa, Joaquim; Fernández-Fernández, Sandra; Ferreira, Caroline; Matos, JoãoThe characterization of wave transformation processes in the nearshore is of paramount importance when it comes to assessing storm and flooding impacts, sediment transportation and deposition, harbors safety or design of coastal protective structures. This study analyzes nonlinear wave parameters on Ofir sandy beach. This beach is located along the northwest Portuguese coast which is a highly energetic coast ex...
Longshore Transport Estimation on Ofir Beach in Northwest Portugal: Sand-Tracer...
Fernández-Fernández, Sandra; Baptista, Paulo; Martins, Virgínia A.; Silva, Paulo A.; Abreu, Tiago; Pais-Barbosa, Joaquim; Bernardes, CristinaThis work aims to shed some light on longshore sediment transport (LST) in the highly energetic northwest coast of Portugal. Data achieved through a sand-tracer experiment are compared with data obtained from the original and the new re-evaluated longshore sediment transport formulas (USACE Waterways Experiment Station’s Coastal Engineering and Research Center, Kamphuis, and Bayram bulk formulas) to assess thei...
The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic inf...
Martins, Virgínia A.; Dias, João A.; Bernardes, Cristina; Rubio, Belén; Bernabeu, Ana; Rey, Daniel; Soares, António M.; Sobrinho, FredericoThe main goal of this work is to distinguish anthropic and climatic influences in sediments from the lagoon of Aveiro (Portugal). This study is based on a core (240-cm long) collected in Murtosa Channel. Optical and X-radiographic images and high-resolution elemental profiles were acquired with ITRAX micro-X-ray fluorescence (XRF) core scanner. Samples collected at each ≈3 cm along the core were analysed for gr...
Assessment of the health quality of Ria de Aveiro (Portugal): heavy metals and ...
Martins, Virgínia A.; Frontalini, Fabrizio; Tramonte, Keila M.; Figueira, Rubens C. L.; Miranda, Paulo; Sequeira, Cristina; Fernández-Fernández, SandraThis work analyses the distribution of heavy metals in the sediments of Ria de Aveiro (Portugal) assessed by total digestion and sequential chemical extraction of the sediments. The influence of environmental parameters on the living benthic foraminiferal assemblages was studied. The most polluted parts in the Ria de Aveiro are areas where the residence time is high and cohesive sediments are deposited. Organic...