The application of unoccupied aerial systems (UAS) for monitoring intertidal oyster density and abundance DOI Creative Commons
Jenny Bueno, Sarah E. Lester, Joshua L. Breithaupt

et al.

Remote Sensing in Ecology and Conservation, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 13, 2024

Abstract The eastern oyster ( Crassostrea virginica ) is a coastal foundation species currently under threat from anthropogenic activities both globally and in the Apalachicola Bay region of north Florida. Oysters provide numerous ecosystem services, it important to establish efficient reliable methods for their effective monitoring management. Traditional techniques, such as quadrat density sampling, can be labor‐intensive, destructive oysters reefs, may spatially limited. In this study, we demonstrate how unoccupied aerial systems (UAS) used efficiently generate high‐resolution geospatial reef condition data over large areas. These data, with appropriate ground truthing minimal effectively monitor size abundance clusters on intertidal reefs. Utilizing structure‐from‐motion photogrammetry techniques create three‐dimensional topographic models, reconstructed distribution, spatial reefs Bay. Ground revealed 97% accuracy cluster presence detection by UAS products confirmed that live are predominately located within clusters, supporting use features estimate population status. We found positive significant relationship between counts. findings allowed us extract predict 138 covering 382 m 2 two locations. Oyster densities varied sites, higher occurring at one site bounds, lower areas adjacent Repeated 2022 2023 relatively stable time. This study demonstrated successful application drone imagery combined providing repeatable method mapping inform conservation, restoration management strategies populations.

Language: Английский

Surfaces of coastal biogenic structures: exploiting advanced digital design and fabrication strategies for the manufacturing of oyster reef and mussel bed surrogates DOI Creative Commons
Jan Hitzegrad, Leon Brohmann, Friedrich Herding

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: April 23, 2024

Coastal biogenic structures, formed by ecosystem engineering species, often feature rough surfaces characterized intricate topographies and highly three-dimensional reliefs. Their are shaped waves tidal currents reciprocally influence the ambient hydrodynamics, reflecting an equilibrium. Despite their significance, impact of these on hydrodynamics remains underexplored due to limited knowledge accurately replicating complex in experimental setups. The recent advent advanced digital manufacturing presents efficient means manufacture complex, surrogate models for modeling. This work explores accurate replication coastal structures modeling examples oyster reef a mussel bed, utilizing flexible design methodology and, first time, particle bed 3D printing with Selective Cement Activation (SCA) as fabrication method. A workflow is proposed, which includes iterative model development based in-situ topographical features, requirements setup, parameters printer SCA. results demonstrate effectiveness achieving validation against set features relevant hydraulic roughness. Particle SCA proved be suitable method modeling, offering advantages such independence production time from surface complexity. However, challenges persist exact comparability between manufactured real particularly very high Nonetheless, generic enable detailed investigations into thereby enhancing understanding processes governing wave energy dissipation attenuation, turbulence production, vertical mixing – critical application nature-based solution protection or restoration efforts.

Language: Английский

Citations

5
Beyond annual metrics: Linking seasonal population dynamics to vertical oyster reef growth DOI Creative Commons
Kai Pfennings, Tom K. Hoffmann, Jan Hitzegrad

et al.

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(9)

Published: Sept. 1, 2024

Abstract Oysters are ecosystem engineering species building reef‐like biogenic structures in temperate shallow water environments, serving as biodiversity hotspots. Recently, also their services such fish nursery, pollutants sink and self‐sustaining coastal protection mechanisms came into a research focus. In light of accelerated sea level rise increasing environmental dynamics, determination vertical growth rates these biosedimentary is paramount assessing resilience. This study embarked on comprehensive survey seasonal reef using terrestrial laser scanning related population dynamics two intertidal reefs built by the non‐native oyster Magallana gigas Wadden Sea. We quantified median at 19.8 mm yr −1 for Kaiserbalje 17.5 Nordland reef. Additionally, we tested hypothesis that variations correspond to local mainly parameters shell length abundance which mirror delayed effects from previous spawning events. Shell were 0.03–0.06 d winter 0.10–0.16 summer, mean autumn 2019 spring 2022 was 627 ± 43 ind. m −2 338 87 respectively. Minor topmost area reflects an emerging equilibrium position actual level. Our findings accordance with natural Crassostrea virginica US East Coast, indicating potential resilience predicted scenarios. Moreover, understanding hydro‐morphodynamic feedback linked will be vital predicting three‐dimensional stability habitats.

Language: Английский

Citations

4
Estimation of Roughness Height on Oyster Reefs DOI Creative Commons
Minjae Lee, Yong Sung Park, Hyoseob Noh

et al.

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(4)

Published: March 26, 2025

Abstract Oyster reefs play a crucial role in coastal protection by attenuating waves and currents, thereby contributing to stability. This protective function is largely due the significantly greater roughness height of oyster than bare sand surfaces. There limited understanding characteristic length appropriate estimation equation needed determine reefs. To address this, experiments were conducted under both unidirectional oscillatory flow conditions explore relationship between geometry their height. The experimental results indicate correlation hydraulic surface rough elements. Furthermore, study proposes unified formula that applicable flows. validity this assessed through its application log law comparison with data. findings facilitate reefs, which essential for characteristics protection.

Language: Английский

Citations

0
Intra-reef surface complexity of the oyster Saccostrea glomerata and it’s influence on surrounding flow DOI

James Barclay,

Jan Hitzegrad, Kara Keimer

et al.

Published: April 4, 2025

Abstract Oyster reef restoration increasingly pursues the goal of enhancing coastal protection that can lead to a reduction in loading on shorelines through flow attenuation waves and currents. However, is dependent factors such as submergence, width, complexity. Yet relationship between elements oyster landscape still not fully understood, making it challenging design nature-based solutions for protection. The topographical roughness characteristics Sydney rock (Saccostrea glomerata) surfaces were investigated using spatial statistics extracted from digital elevation models. agglomerations classified into three distinct structural classes (Patch I, Patch II Cluster) differentiate intra-reef I types had greater heights (total height, kt = 74 ± 10 mm) than (kt 56 9 mm). Benthic instantaneous velocity readings taken at windward, leeward on-reef points each delineated class. Of samples examined, observations made beds with higher values experienced reduction. While direct link cannot be established, future work, results this study assist achieving meaningful targets patch-scale substrate.

Language: Английский

Citations

0
Optimal Post-Processing Kinematic UAV Photogrammetry Mapping for Volumetric Sandy Beach Mapping DOI

Nursyafiqah Jessica Georgeson,

Ahmad Razali Yusoff,

Radzuan Sa’ari

et al.

Lecture notes in geoinformation and cartography, Journal Year: 2025, Volume and Issue: unknown, P. 343 - 355

Published: Jan. 1, 2025

Language: Английский

Citations

0
Wave-Induced Hydrodynamics of Biogenic Structures in the Central Wadden Sea: Implications of the Transformation from Mussel Beds to Oyster Reefs for Wave Attenuation DOI Creative Commons
Jan Hitzegrad,

Lisa Rentsch,

Tom K. Hoffmann

et al.

Coastal Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 104763 - 104763

Published: April 1, 2025

Language: Английский

Citations

0
Intra-reef Surface Complexity of the Oyster Saccostrea glomerata and Its Influence on Surrounding Flow DOI Creative Commons

James Barclay,

Jan Hitzegrad, Kara Keimer

et al.

Estuaries and Coasts, Journal Year: 2025, Volume and Issue: 48(4)

Published: April 23, 2025

Language: Английский

Citations

0
From Remote Sensing to Artificial Intelligence in Coral Reef Monitoring DOI Creative Commons
Victor J. Piñeros, Alicia Maria Reveles-Espinoza, Jesús A. Monroy

et al.

Machines, Journal Year: 2024, Volume and Issue: 12(10), P. 693 - 693

Published: Oct. 1, 2024

This review comprehensively covers the development of viable unmanned underwater vehicles based on their technical capabilities, in particular those designed to conduct research exploration ecosystems and address environmental issues through analysis coral reef vulnerability. The most important elements be obtained are situ data samples for characterization, supported by molecular biomarkers marine ecology indicators. following aspects considered this study: first, geographic distribution reefs study biological approaches detection evaluate vulnerability detailed; then, technologies currently available briefly described, ranging from large-scale capture local-scale directly region, taking advantage remote sensing systems assisted aerial technologies, vehicles, artificial intelligence mapping, monitoring, management as well characterization vulnerability; this, existing vehicle generally explained, including a categorical description an updated highlighted list innovative robust that have been used applications; capabilities such throughout missions they subjected presented bibliographic references; finally, promotes multidisciplinary work integrate developments associated knowledge areas order obtain synergies face challenges related massive scale degradation worldwide.

Language: Английский

Citations

3
Drone-based monitoring of intertidal blue mussel beds in the Wadden Sea – comparison of a threshold and two machine learning approaches DOI

Marc Schnurawa,

Jasmin Mueller, Hanna Schade

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: April 30, 2024

In the Wadden Sea, intertidal mussel beds of blue ( Mytilus edulis ) and Pacific oyster Magallana gigas form distinct epibenthic communities local hotspots high biomass biodiversity. To detect evaluate natural anthropogenic processes, a ground-based monitoring program started over 25 years ago in German Sea. this study, we describe potential drones machine learning approaches for remote sensing-based integration into an existing beds. A fixed wing drone was used to cover area up 39ha single flight, with overall time saving 50%. Applying approaches, detailed extraction bed coverage accuracy (OA) 95.6% reached, applying Support Vector Machine (SVM). The application multispectral sensor improved classification performance. Compared monitoring, drone-based method provided significantly more information on extension, coverage, associated algae results show that can provide non-invasive way survey large difficult access areas providing maps their internal structures.

Language: Английский

Citations

1
The application of unoccupied aerial systems (UAS) for monitoring intertidal oyster density and abundance DOI Creative Commons
Jenny Bueno, Sarah E. Lester, Joshua L. Breithaupt

et al.

Remote Sensing in Ecology and Conservation, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 13, 2024

Abstract The eastern oyster ( Crassostrea virginica ) is a coastal foundation species currently under threat from anthropogenic activities both globally and in the Apalachicola Bay region of north Florida. Oysters provide numerous ecosystem services, it important to establish efficient reliable methods for their effective monitoring management. Traditional techniques, such as quadrat density sampling, can be labor‐intensive, destructive oysters reefs, may spatially limited. In this study, we demonstrate how unoccupied aerial systems (UAS) used efficiently generate high‐resolution geospatial reef condition data over large areas. These data, with appropriate ground truthing minimal effectively monitor size abundance clusters on intertidal reefs. Utilizing structure‐from‐motion photogrammetry techniques create three‐dimensional topographic models, reconstructed distribution, spatial reefs Bay. Ground revealed 97% accuracy cluster presence detection by UAS products confirmed that live are predominately located within clusters, supporting use features estimate population status. We found positive significant relationship between counts. findings allowed us extract predict 138 covering 382 m 2 two locations. Oyster densities varied sites, higher occurring at one site bounds, lower areas adjacent Repeated 2022 2023 relatively stable time. This study demonstrated successful application drone imagery combined providing repeatable method mapping inform conservation, restoration management strategies populations.

Language: Английский

Citations

0