On Eddy-Mixed Longshore Currents: Video Observation and 3D Modeling off Grand Popo Beach, Benin

Marchesiello, Patrick; Almar, Rafaël; Benshila, Rachid; Larnier, Stanislas; Castelle, Bruno; McWilliams, James C.

doi:10.2112/si75-082.1

Cited by 7 publications

(4 citation statements)

References 12 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Flash rips and surf eddies are transient horizontal structures of the order of 10 to 100 m, which can be generated in the surf zone in the absence of bathymetric irregularities. Using video-derived current fields, Marchesiello et al 64 , 65 revisited the processes of surf eddy generation with a new three-dimensional wave resolution model (CROCO) and provided a plausible demonstration of new 3D non-hydrostatic instability and turbulent cascade. Instant fields of surface current were retrieved from shore-based video cameras and unmanned aerial vehicles ( UAV s) by an optical flow (OF) method named " Typhoon " 66 .…”

Section: New Insights Through Coastal Video Camera Monitoringmentioning

confidence: 99%

African coastal camera network efforts at monitoring ocean, climate, and human impacts

Ondoa

Almar

Angnuureng

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Regular and long-term monitoring of coastal areas is a prerequisite to avoiding or mitigating the impacts of climate and human-driven hazards. In Africa, where populations and infrastructures are particularly exposed to risk, there is an urgent need to establish coastal monitoring, as observations are generally scarce. Measurement campaigns and very high-resolution satellite imagery are costly, while freely available satellite observations have temporal and spatial resolutions that are not suited to capture the event scale. To address the gap, a network of low-cost, multi-variable, shore-based video camera systems has been installed along the African coasts. Here, we present this network and its principle of sharing data, methods, and results obtained, building toward the implementation of a common integrated coastal management policy between countries. Further, we list new contributions to the understanding of still poorly documented African beaches’ evolution, waves, and sea level impacts. This network is a solid platform for the development of inter-disciplinary observations for resources and ecology (such as fisheries, and sargassum landing), erosion and flooding, early warning systems during extreme events, and science-based coastal infrastructure management for sustainable future coasts.

show abstract

Section: New Insights Through Coastal Video Camera Monitoringmentioning

confidence: 99%

African coastal camera network efforts at monitoring ocean, climate, and human impacts

Ondoa

Almar

Angnuureng

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Both components feature low-frequency oscillations ( Fig. 3 and 4, top) induced by groupiness, infragravity or shear waves [23], [28]. Passing waves with an oblique angle (H s = 1.1 m, T p = 11 s, Dir = 10 • , see [28]) are the dominant signal in the 0.5 Hz cross-shore component (Fig.…”

Section: B Wave-by-wave Currents: Comparison With An Acoustic Dopplementioning

confidence: 99%

“…7 presents a sequence of four images (after UAV motion compensation, before any filtering, akin to Fig. 2.c) featuring the inception and development of the rip into a narrow filament [28]. Without proper image rectification for this data set, the conversion from observed displacement to instantaneous velocity (1) is not possible.…”

Section: B Wave-by-wave Currents: Comparison With An Acoustic Dopplementioning

confidence: 99%

Wavelet-Based Optical Flow Estimation of Instant Surface Currents From Shore-Based and UAV Videos

Dérian

Almar

2017

IEEE Trans. Geosci. Remote Sensing

Self Cite

View full text Add to dashboard Cite

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

“…5 Domestic scholars such as Chen Qian and Wang Yudi, as well as related institutions, have also carried out research work on VR technology and applications, and achieved certain results. 6 This article studies the application of 3D animation technology in virtual medical scenes, so as to improve the interactivity and immersion of 3D animations in virtual medical scenes. 7 VR allows users to experience a sense of presence in a 3D computer-generated environment.…”

Section: Introductionmentioning

confidence: 99%

Animation of virtual medical system under the background of virtual reality technology

2021

Computational Intelligence

View full text Add to dashboard Cite

Virtual reality technology is a technology that uses a variety of scientific technologies such as computer systems, image displays, and sensors to perform human-computer interaction. Since the advent of virtual reality technology, the virtual reality + medical model has been highly expected. At present, three-dimensional (3D) animation technology can be used in combination with virtual reality technology in medical systems. 3D animation technology can transform the transformed human medical image into a 3D character model, and animate the corresponding bones, and observe the model on the screen and operate the model like real surgery, completing virtual medical content learning, virtual medical skill training, virtual surgery preview. Applying 3D animation technology to virtual reality surgery training can effectively bypass the limitations of traditional surgery training modes, form multiple interactive real-time effects, and bring a rich perceptual experience to the audience. Based on the above background, the research content of this article is the study of virtual medical system animation under the background of virtual reality technology. This paper analyzes the feasibility of virtual reality technology and 3D animation modeling, and designs a virtual medical Liang Li and Tingting Li are co-first authors.

show abstract

On Eddy-Mixed Longshore Currents: Video Observation and 3D Modeling off Grand Popo Beach, Benin

Cited by 7 publications

References 12 publications

African coastal camera network efforts at monitoring ocean, climate, and human impacts

African coastal camera network efforts at monitoring ocean, climate, and human impacts

Wavelet-Based Optical Flow Estimation of Instant Surface Currents From Shore-Based and UAV Videos

Animation of virtual medical system under the background of virtual reality technology

Contact Info

Product

Resources

About