14 documents found, page 1 of 2
Wave Impact Analysis on a Beach-Dune System to Support Coastal Management and N...
Fontán-Bouzas, Ángela; Andriolo, Umberto; Silva, Paulo A.; Baptista, PauloAt coasts, sandy beach-dune systems act as natural barriers to environmental forcing, preventing coastal flooding and protecting coastal communities. In the context of coastal studies, it is fundamental to identify beach-dune sectors exposed to wave impact to support coastal management and suggest soft engineering interventions. This work examines the morphodynamics of the Mira beach-dune system on the northern...
On the 3D Reconstruction of Coastal Structures by Unmanned Aerial Systems with ...
Gonçalves, Diogo; Gonçalves, Gil; Pérez-Alvávez, Juan Antonio; Andriolo, UmbertoA wide variety of hard structures protect coastal activities and communities from the action of tides and waves worldwide. It is fundamental to monitor the integrity of coastal structures, as interventions and repairs may be needed in case of damages. This work compares the effectiveness of an Unmanned Aerial System (UAS) and a Terrestrial Laser Scanner (TLS) to reproduce the 3D geometry of a rocky groin. The S...
Beached and Floating Litter Surveys by Unmanned Aerial Vehicles: Operational An...
Andriolo, Umberto; Garcia-Garin, Odei; Vighi, Morgana; Borrell, Asunción; Gonçalves, GilThe abundance of litter pollution in the marine environment has been increasing globally. Remote sensing techniques are valuable tools to advance knowledge on litter abundance, distribution and dynamics. Images collected by Unmanned Aerial Vehicles (UAV, aka drones) are highly efficient to map and monitor local beached (BL) and floating (FL) marine litter items. In this work, the operational insights to carry o...
Projeto To-SEAlert. Desenvolvimentos recentes
Zózimo, Ana Catarina; Fortes, Conceição; Santos, João Alfredo; Pinheiro, Liliana; Lemos, Rute; CAPITÃO, RUI; Fonseca, Ana; Roque, D.; Taborda, RuiO projeto To-SEAlert tem como objetivo a inclusão de um conjunto de ferramentas/metodologias de modo a tornar o sistema HIDRALERTA (Poseiro, 2019, Fortes et al., 2020, Pinheiro et al., 2020) mais eficiente, fiável e robusto. Essas ferramentas incluem o uso de imagens de satélite e de vídeo, de modelação numérica e física, métodos quantitativos e probabilísticos para a avaliação do risco e planeamento de emergên...
Citizen Science for Marine Litter Detection and Classification on Unmanned Aeri...
Merlino, Silvia; Paterni, Marco; Locritani, Marina; Andriolo, Umberto; Gonçalves, Gil; Massetti, LucianoUnmanned aerial vehicles (UAV, aka drones) are being used for mapping macro-litter in the environment. As drone images require a manual processing task for detecting marine litter, it is of interest to evaluate the accuracy of non-expert citizen science operators (CSO) in performing this task. Students from Italian secondary schools (in this work, the CSO) were invited to identify, mark, and classify stranded l...
3D Reconstruction of Coastal Cliffs from Fixed-Wing and Multi-Rotor UAS: Impact...
Gonçalves, Gil; Gonçalves, Diogo; Gómez-Gutiérrez, Álvaro; Andriolo, Umberto; Pérez-Alvárez, Juan AntonioMonitoring the dynamics of coastal cliffs is fundamental for the safety of communities, buildings, utilities, and infrastructures located near the coastline. Structure‐from‐Motion and Multi View Stereo (SfM‐MVS) photogrammetry based on Unmanned Aerial Systems (UAS) is a flexible and cost‐effective surveying technique for generating a dense 3D point cloud of the whole cliff face (from bottom to top), with high s...
Quantifying Marine Macro Litter Abundance on a Sandy Beach Using Unmanned Aeria...
Gonçalves, Gil; Andriolo, Umberto; Gonçalves, Luísa; Sobral, Paula; Bessa, FilipaUnmanned aerial systems (UASs) have recently been proven to be valuable remote sensing tools for detecting marine macro litter (MML), with the potential of supporting pollution monitoring programs on coasts. Very low altitude images, acquired with a low-cost RGB camera onboard a UAS on a sandy beach, were used to characterize the abundance of stranded macro litter. We developed an object-oriented classification...
Breaking Wave Height Estimation from Timex Images: Two Methods for Coastal Vide...
Andriolo, Umberto; Mendes, Diogo; Taborda, RuiThe breaking wave height is a crucial parameter for coastal studies but direct measurements constitute a di cult task due to logistical and technical constraints. This paper presents two new practical methods for estimating the breaking wave height from digital images collected by shore-based video monitoring systems. Both methods use time-exposure (Timex) images and exploit the cross-shore length (LHs) of the ...
Quantifying Marine Macro Litter Abundance on a Sandy Beach Using Unmanned Aeria...
Gonçalves, Gil; Andriolo, Umberto; Gonçalves, Luisa; Sobral, Paula; Bessa, FilipaUnmanned aerial systems (UASs) have recently been proven to be valuable remote sensing tools for detecting marine macro litter (MML), with the potential of supporting pollution monitoring programs on coasts. Very low altitude images, acquired with a low-cost RGB camera onboard a UAS on a sandy beach, were used to characterize the abundance of stranded macro litter. We developed an object-oriented classification...
Nearshore Wave Transformation Domains from Video Imagery
Andriolo, UmbertoWithin the nearshore area, three wave transformation domains can be distinguished based on the wave properties: shoaling, surf, and swash zones. The identification of these distinct areas is relevant for understanding nearshore wave propagation properties and physical processes, as these zones can be related, for instance, to di erent types of sediment transport. This work presents a technique to automatically ...