environmental

Environmental studies 2024

Authors: Darshika Manral, Ilse Bos, Mark de Boer, Erik van Sebille. Juvenile Kemp's ridley turtles, a critically endangered species mainly living in the Gulf of Mexico, strand on the Dutch coasts every year. This study examines several instances over the last 15 years where juvenile turtles were found alive but hypothermic during winter in the Netherlands to understand how they were transported in this state.

Authors: Zehao Wang, Defeng Zheng, Xingsen Guo, Zhongde Gu, Yueqiang Shen, & Tingkai Nian This study addresses the impact of submarine landslides on underwater structures, focusing on bucket foundations. It aims to fill a knowledge gap by developing a fluid-structure coupling system using the coupled Smoothed Particle Hydrodynamics (SPH)-Finite Element Method (FEM) to analyze the displacement response of these foundations during landslide impacts. Its authors outline the methods used, the results obtained, and the significance of the findings in understanding the dynamic response and failure mechanisms of underwater structures under extreme conditions.

Authors: Sven Bergmann, Matthias Brenner, Jennifer Susanne Strehse, Tobias Hartwig Bünning, Edmund Maser, Philipp Grassel, David Heuskin, David Brandt, Marco Berger, Simon van der Wulp, Mathew Skellhorn, Polly Hil, Sven Van Haelst, Maarten De Rijcke, Uwe Wichert The text intends to inform the reader about ongoing research efforts within the EU Interreg project North Sea Wrecks (NSW) and its collaboration with the German Aerospace Centre and the Institute for the Protection of Maritime Infrastructures (DLR) to assess and understand the environmental risks posed by shipwrecks and dumped munitions in the North Sea and globally. It details the methodologies used, such as historical document analysis, visual inspections, and sample analysis.

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Authors: Sheng Wu, Nian Jiang, Shuai Zhang, Pingping Zhang, Peng Zhao, Yang Liu, & Yanhui Wang This document analyzes the technological feasibility and potential environmental impacts of offshore floating photovoltaic (PV) plants to highlight the advantages of floating PV systems, particularly in marine environments, and to address the current low technology readiness level in this new field. It also seeks to explore the interactions between offshore floating PV plants and the marine environment throughout the entire life cycle of the PV systems, from manufacturing to disposal.

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Authors: V. Trinadha Rao, V. Suneel, Venkata Sai Gulakaram, & Chilukuri Lakshmi Sravani This study focused on the computation and analysis of monthly climatological Lagrangian coherent structures (cLCS) in the Bay of Bengal (BoB) using 24 years of ocean current and wind data to reveal the cLCS associated with seasonal monsoon currents and mesoscale processes, validate these structures with satellite imagery and modeled oil spill trajectories, and demonstrate their application in predicting the transport and accumulation zones of pollutants like oil spills

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Authors: Romain Stefanelli, Maria Rosa Beccia , Pier Lorenzo Solari, David Suhard, Sophie Pagnotta, Aurelie Jeanson, Jean Ulrich Mullot, Françoise Vernier, Christophe Moulin, Marguerite Monfort, Jean Aupiai, Christophe Den Auwer This study focused on understanding uranium accumulation, speciation, and localization in marine biota, specifically using mussels as sentinel species to assess the environmental impact of uranium, particularly in marine ecosystems, by employing various analytical, spectroscopic, and imaging techniques. The study also highlights the differences in uranium accumulation between mussels from two different locations and outlines future research directions to identify the proteins or metabolites involved in uranium complexation.

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Authors: Changjing Fu, Yangming Xu, and Tianlong Zhao This document discusses the findings from a flume model test that examined the evolution pattern of riverbeds and the mechanisms of local scour under unsteady flow conditions to provide insights into the susceptibility of pipelines to suspension during floods, the stages of this suspension process, and the factors affecting erosion. Additionally, it offers recommendations for enhancing erosion resistance in pipeline-laying projects and suggests that the study can serve as a reference for pipeline engineering design and protection strategies.

Authors: Jiarui Xie, Ruichao Xue, Fuqiang Niu, Benqing Chen, and Yanming Yang This article presents a study on the effects of high-intensity impulsive noise from pile driving on fish, specifically focusing on the large yellow croaker. It highlights the importance of using advanced numerical acoustic models, notably a 3D parabolic equation method, to accurately predict underwater noise propagation in complex coastal environments to demonstrate the inadequacy of simplistic models and the necessity of considering three- dimensional propagation effects to assess the environmental impact on marine life accurately.

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Authors: Muhammad Saladin Prawirasasra This document thesis summarizes and highlights the key features and findings of a series of scientific publications related to the study of underwater vocalizations of pinnipeds, the impact of ferry noise on ringed seals, the effects of ship-radiated sound on pinnipeds, and the analysis of wind-driven ambient sound spectra. It outlines the specific focus of each publication and the ecological and biological implications of the research conducted.

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Authors: Han Tian, Junsheng Zhong, Jiangyuan Chen, Yane Jiang, Jun Zhang, Wei Xie, Zuyuan Gao, Yuchao Wang, Haozhen Liu, Sujing Wang, Fei Zhang, Jie Yang, and Kedong Yin This study documents the first recorded presence of Pacific sleeper sharks in the deep waters off the southeast coast of Hainan Island in the South China Sea. The study involved using a dead cow as bait and a metal-framed cage with cameras to observe the sharks' feeding behavior. The findings indicate an expansion of the known habitat range of this shark species and suggest broader implications for understanding the geographic connectivity and habitat ranges of large marine animals. The study also highlights the potential impact of anthropogenic influences, such as climate change, on the distribution of marine species.

Authors: Subhatra Sivam, Chidong Zhang, Dongxiao Zhang, Lisan Yu, and Isabella Dressel This study evaluates the accuracy of sea surface latent and sensible heat fluxes from three global reanalysis products (NASA MERRA2, ECMWF ERA5, NOAA CFSR2) by comparing them with observations from sail drones to validate these reanalysis products in the context of the Pacific sub-Arctic open ocean. It highlights discrepancies, particularly with CFSR2, while suggesting that MERRA2 and ERA5 are generally reliable for representing mean air- sea exchanges but may have limitations for high- frequency variability studies.

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Authors: Martina Canessa, Rosella Bertolotto, Federico Betti, Marzia Bo, Alessandro Dagnino, Francesco Enrichetti, Margherita Toma, and Giorgio Bavestrello This study analyzes the impact of environmental and human-induced stressors on the red gorgonian Paramuricea clavata in the Mediterranean Sea. It discusses the threats this species faces, such as heat waves and fishing activities, and examines the correlation between these stressors and the occurrence of epibiosis on the gorgonian colonies. It also highlights the importance of long-term monitoring to understand changes in marine benthic communities.

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Authors: Silvia Bossi, Luciano Blasi, Giacomo Cupertino, Ramiro dell Erba, Angelo Cipollini, Saverio De Vito, Marco Santoro, Girolamo Di Francia, and Giuseppe Marco Tina This study analyzes the current state of monitoring practices for floating photovoltaic (FPV) plants, highlighting the need for standardized guidelines and criteria for water quality monitoring and management. It discusses the challenges and environmental impacts associated with FPV systems, the importance of monitoring key physico-chemical parameters, and the potential of autonomous solutions for environmental impact monitoring to identify gaps in the existing literature and propose the development of a cohesive framework for effective monitoring of FPV systems.

Authors: Michael C. Denes, and Erik van Sebille The paper intends to describe and promote the features and capabilities of the "plastic parcels" Python package to inform about its functionalities for simulating the transport and dispersion of plastics in the ocean, its integration with the parcels framework, and its adaptability for various computational environments. It also highlights the package's modular design, user-friendly interface, and potential applications in research and development related to ocean plastic pollution modeling. Additionally, it outlines future goals for the package, such as support for macroplastics and cloud platform integration.

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13 - Cellular adaptations of the scleractinian coral Madracis pharensis to chronic oil pollution in a Mediterranean shipwreck.

Authors: Alessandro Nardi, Vasilis Resaikos, Magdalene Papatheodoulou , Marta Di Carlo, Harini Vedhanarayanan, Francesco Regoli, Stefania Gorbi, and Carlos Jimenez Chemical pollution in marine ecosystems affects stress levels and interacts with climate change. This study examined epibenthic communities near a shipwreck in the Levantine Basin, comparing oil-contaminated and clean areas. Results showed different community structures over 11 years, with increased PAH levels in impacted corals. The coral Madracis pharensis showed adaptations to stress, but implications of these changes are still unclear.

17 - Artificial structure selection by economically important reef fishes at North Carolina artificial reefs.

Author: Ryan M. Tharp, Nathan J. Hostetter, Avery B. Paxton, J. Christopher Taylor, and Jeffrey A. Buckel. Artificial reefs can help manage marine fisheries by improving natural habitats. However, the selection of structures for these reefs often lacks proper information. From 2021-2022, 72 black sea bass, 34 gag, 27 greater amberjack, nine almaco jack, and eight red snapper were tagged near Cape Lookout, North Carolina. Black sea bass showed little movement, while gag and red snapper moved between structures. Greater amberjack and almaco jack explored the most, favoring high relief structures like vessels. These findings will aid managers in selecting effective structures for artificial reefs.

38 - An Icy Worlds life detection strategy based on Exo-AUV.

Authors: Bin Wang, & Hongde Qin Icy Worlds like Europa and Enceladus may hold answers to the search for life beyond Earth. Exo-AUV technology is promising for detecting life in these icy oceans. This study explores a hypothetical life detection mission on Europa, focusing on goals, regions, and analysis needed for success. It proposes strategies and outlines the technology needed for Exo-AUVs, while addressing challenges and suggesting a roadmap for their development to help scientists find biosignatures and potential life forms.

48 - An Assessment of Demersal Elasmobranch Occurrence and Associated Habitats Using an Autonomous Underwater Vehicle (AUV).

Authors: Jonathon Taylor, John A. Howe, James Thorburn, Clive J. Fox, Christopher McGonigle, Petra Rybanska Plastic debris in coastal areas experiences weathering, but the effects on different sides of the same plastic are not well studied. This research collected 1573 plastic fragments and found notable weathering differences between exposed and shaded sides. The study revealed that the sun-exposed sides showed more damage, with increased cracks, while shaded sides remained smoother. Results indicate uneven weathering, providing insights for better predicting plastic degradation and informing pollution reduction strategies.

51 - Benthic Feeding and Diet Partitioning in Red Sea Mesopelagic Fish Resolved Through DNA Metabarcoding and ROV Footage.

Authors: Kah Kheng Lim, Carlos Angulo-Preckler, Christopher A. Hempel, Mohammad A. Qurban, Vincent A. Pieribone, Carlos M. Duarte Mesopelagic fish are important for carbon capture due to their daily movements, but their diets are not well understood in the Red Sea. This study looks at two common species, lanternfish and lightfish, using DNA analysis and video. Lightfish have a broader diet than lanternfish, which mainly eat copepods. Both species also consume other prey but differ in their dietary choices. The study shows these fish feed on the sea floor, a rare behavior. Their feeding helps carbon storage in the ocean, highlighting the need for more research on their ecological roles.

49 - Two sides of the same coin: weathering differences of plastic fragments in coastal environments around the globe.

Authors: Bo Hu, Mui-Choo Jong, João Frias, Irina Chubarenko, Gabriel Enrique De-la-Torre, Prabhu Kolandhasamy, Md. Jaker Hossain, Elena Esiukova, Lei Su, Hua Deng, Wenjun Zhao, Yifan Zheng, Huahong Shi Mesopelagic fish are important for carbon capture due to their daily movements. This study looks at two common species, lanternfish and lightfish, using DNA analysis and video. Lightfish have a broader diet than lanternfish, which mainly eat copepods. Both species also consume other prey but differ in their dietary choices. The study shows these fish feed on the sea floor, a rare behavior. Their feeding helps carbon storage in the ocean, highlighting the need for more research on their ecological roles.

Authors: Amy MacIntosh, Daniel T. Oldfield, Dioni I. Cendon, Andrew D. Langendam, Nicholas Howell, Daryl L. Howard, Tom Cresswell This study identifies a dense crystalline matrix of baryte (BaSO4) in a decommissioned subsea well tubular pipe, influenced by changing chemical and physical environments. The scale's radioactivity is strongly correlated with baryte, and it gradually formed within the pipe's interior over 17 years of production. This knowledge can help in decommissioning planning and mitigate potential radiological risks to marine ecosystems, enhancing offshore petroleum infrastructure decommissioning decisions.

06 - Naturally occurring radioactive materials in offshore infrastructure: Understanding formation and characteristics of baryte scale during decommissioning planning

07 - Sea of plastic: representations of the sea and pro-environmental attitudes and behaviors regarding marine plastic pollution in Peru and Chile

Authors: Fernanda Saavedra, Marisol Mego, Sofia Ticona, Martin Thiel, Jostein Baeza, and Agustín Espinosa This study examines the attitudes and pro-environmental behaviors of Peruvian and Chilean citizens towards marine pollution, focusing on plastic pollution. It shows a positive perception of the sea, which fulfills recreational and economic purposes. Environmental concern is anthropocentric, focusing on individuals and society. However, most initiatives proposed are individual actions, indicating a low commitment from authorities.

08 - Biofouling initial succession on offshore artificial substrate under subtropical conditions

Author: Vanessa o. agostini & Carla P. Ozorio This study examines the macrofouling community on artificial substrates exposed to offshore subtropical marine environments. It reveals that depth, exposure time, UV- radiation, rainfall, temperature, pH, salinity, water chlorophyll-a, and zooplankton supply contribute to the establishment of the community. It also demonstrate that species richness and density increased at depths of 3m and 22m, while zooplankton composition did not show a simultaneous temporal relationship with invertebrate recruitment.

Authors: Peter A. Todd, Clara Lei Xin Yong, Sze Hui Foo, Lynette Shu Min Ying and Janine Ledet Marine microplastics pose a global pollution issue, necessitating the development of plastic-less field sampling techniques. Traditional designs can be repurposed or self-developed using materials like metal, wood, silk, and cork. These techniques can significantly reduce or eliminate plastics from the field sampling process, reducing contamination and promoting sustainable practices in marine environments.

09 - Plastic-less equipment for sampling marine microplastics

10 - Editorial: New plastic pollution types and novel sources of microplastic pollution in marine systems

Author: Sonja M. Ehlers, Julius A. Ellrich, and Ignacio Gestoso. Plastic pollution is a growing concern, with animals entangled in discarded plastic and microplastics consumed during foraging. New sources, such as weathering polymer-based paints, have been identified recently. These plastic forms differ from regular debris in appearance, chemical composition, and environmental fate. This study aims to increase awareness of these novel plastic pollution sources and their potential environmental effects, enabling them to be characterized and incorporated into mitigation measures.

14 - The present and future contribution of ships to the underwater soundscape

Authors: Luca Possenti, Lennart de Nooijer, Christ de Jong, Frans- Peter Lam, Simon Beelen, Johan Bosschers, Tom van Terwisga, Rens Stigter, and Gert-Jan Reichart Since the industrial revolution, the ocean has become noisier due to increased shipping, which can negatively impact fish, invertebrates, marine mammals, and birds. Engineers are now exploring ways to reduce ship noise in new ship designs. This review discusses the future underwater soundscape in the ocean, comparing open and shallow seas, and the effects of water quality on ship- radiated noise, particularly propeller cavitation noise.

15 - Assessment of mariculture-derived microplastic pollution in Dapeng Cove, China

Authors: Yong Xu, Shilin Li, Jianlei Chen, and Zhengguo Cu Marine microplastic pollution, along with ocean acidification and greenhouse effects, is a global concern. This study highlights a moderate level of microplastic pollution, with fibers being the predominant shape in Dapeng Cove (China). Long-term mariculture development has led to a large amount of microplastics in water and sediments. The study suggests enhancing regulations on plastic products, reducing microplastic production and release, and developing alternatives to plastic fishing gear.

Author: Abirami A Marine pollution, a major global issue, is caused by human activities like improper disposal, shipping, and overfishing. It harms ecology, health, and economic institutions. Solutions include international agreements, sustainable fishing, improved waste disposal, and raising awareness. Governments, environmental organizations, and advocacy groups are working to reduce pollution, protect biodiversity, and reduce financial expenses.

16 - Marine Pollution and Waste Management

26 - Offshore oil and gas infrastructure plays a minor role in marine metapopulation dynamics

Authors: Ronen Galaiduk, Dianne L. McLean, Conrad W. Speed, Dougal Greer, Rhys McIntosh, Eric A. Treml This study reveals that the removal of offshore oil and gas infrastructure in the Bass Strait, Australia, has varying effects on marine population dynamics, including connectivity. While platforms are not major sources for most species, they act as modest sources for Corynactis australis (jewel anemone). Subsea pipelines, however, act as stepping-stones for all species except for long-spined sea urchin. It recommends that decisions to remove offshore infrastructure should be made on a platform-by- platform basis, considering pipeline contributions to connectivity and metapopulation dynamics.

27 - Revision of China’s marine environmental protection law: history, background and improvement

Author: Ruiqiang Liu China’s law on marine environmental protection is part of environmental law and outlines the measures to protect marine environments. Since its introduction in 1982, China's Marine Environmental Protection Law has been revised and amended to form a legal system based on the Constitution. The 2023 revision focused on improving mechanisms, coordinating land and sea efforts, enhancing supervision, managing marine litter, protecting biodiversity, regulating estuaries, and enforcing strict liability.

32 - Metatranscriptomic response of deep ocean microbial populations to infusions of oil and/or synthetic chemical dispersant

Authors: Tito D. Peña-Montenegro, Sara Kleindienst, Andrew E. Allen, A. Murat Eren, John P. McCrow, Jonathan Arnold, Samantha B. Joye Oil spills significantly impact the marine environment, impacting the local microbiome. Previous studies showed that synthetic dispersants alone did not enhance microbial activity or oxidation rates of hydrocarbon components. However, exposure to oil, but not dispersants, increased the abundance of other taxa and stimulated hydrocarbon oxidation rates. This study interpreted metatranscriptomic data to explore how specific microbial community components respond to different organic carbon exposure regimes.

31 - The Brazilian Santos basin underwater soundscape monitoring project (PMPAS-BS)

Authors: Jose Antonio Moreira Lima, William Soares Filho, Fabio C. Xavier, Thiago Pires de Paula, Angela Spengler, Fernando Goncalves de Almeida, Diogo Peregrino Correa Pereira, Valeria Souza Rego, Catia Galotta, Carlos Correa Junior, and Alexandre Bazyl The Santos Basin Underwater Soundscape Monitoring Project (PMPAS-BS) is a Brazilian initiative aiming to quantify and assess hydroacoustic noise from anthropogenic sources in the southeastern Brazilian continental margin of the South Atlantic Ocean. The project covers over 251,000 km2 and uses mobile, fixed shallow-water, and fixed oceanic monitoring methods. It focuses on noise associated with oil and gas exploration, production activities, and shipping lanes.

37 - Comparing the environmental impacts of pollution from two types of industrial zones on the coast

Authors: Jian Liang, Chae-Woo Ma, and Kwang-Bae Kim This study compares the environmental impact of ironworks and shipyards along South Korea's coast. Heavy metal pollution near these zones was assessed using the Pollution Load Index (PLI) and Nemerow Pollution Index (Pn) to provide insights for the South Korean government in managing coastal industrial zones and formulating relevant policies.

42 - A Submersible Power Station: Part A Helium Power Conversion Unit

Authors: Jon Serna, Eduardo Anselmi Palma, Stefania Romero, Dimitrios Fouflias, and Pericles Pilidis Nuclear power holds promise in the green revolution, but public opinion is mixed. A submersible nuclear power station concept is presented to address concerns and promote growth. This submarine can move under its own power, be earthquake-proof, and be built, commissioned, maintained, refueled, and scrapped in countries like the UK. The design, similar to the largest existing nuclear submarines, could deliver 0.6 to 1 GW of electrical power.

43 - Using underwater mini-ROV for coral eDNA survey: a case study in Okinawan mesophotic ecosystems

Authors: Noriyuki Satoh, Frederic Sinniger, Haruhi Narisoko, Shinichiro Nagahama, Nobuhiro Okada, Yuki Shimizu, Yuki Yoshioka, Kanako Hisata, Saki Harii Mesophotic coral ecosystems (MCEs) are light-dependent communities at depths of 30-150 meters, providing refuge against thermal stress. They have a high diversity of communities and are not immune to anthropogenic threats. To detect and characterize MCEs, the study’s authors improved the mesophotic scleractinian survey method using environmental DNA metabarcoding analysis, testing this approach at upper mesophotic sites in Okinawa, Japan, detecting dominant coral genera and other genera.

46 - Light Pollution in the Arctic Marine Environment

Authors: Ifeoluwa Ihotu Kayode-Edwards, and David Osagie Agbontaen Light pollution, a form of artificial light, disrupts natural illumination, disrupting ecosystems and obscuring celestial observations. It is particularly important in the Arctic due to its unique environmental and cultural significance. The region's prolonged winter darkness is crucial for species survival and traditional practices, while minimal light pollution impairs astronomical research. Mitigating light pollution supports biodiversity conservation, indigenous culture preservation, and scientific advancement, highlighting the need for sustainable lighting practices and targeted policies.

47 - Microplastics pollution in Indian marine environment: sources, effects and solutions

Authors: Josephine Anthony, Sureka Varalakshmi, Ashok Kumar Sekar, Kumar Thalavai Sivasankarasubbiah, Thilagam Harikrishnan, Vijaya Raghavan Rangamaran, Dharani Gopal, and Kirubagaran Ramalingam Ingestion of microplastics by marine organisms and humans can lead to physiological harm, including inflammation, digestive blockages, and hormonal imbalances. This review highlights the sources, types, and transport of microplastics, as well as analytical methods for detecting pollution. Comprehensive strategies, including policy interventions and public awareness campaigns, are essential for preserving marine ecosystems and human livelihoods.

Authors: Jenna M. Hynes, Rachelle E. Beattie, A. Denene Blackwood, Thomas Clerkin, Javier Gallard- Go´ngora, Rachel T. Noble The study investigates the declining water quality in Town Creek Estuary (TCE), North Carolina, due to factors like increased tourism and climate change. It combines traditional microbiological methods with innovative molecular techniques and GIS data to identify and rank contamination sources. The findings reveal a correlation between fecal indicator bacteria (FIB) concentrations and rainfall, with higher levels found near aged sewage infrastructure. This integrated approach aids municipalities in prioritizing infrastructure repairs and understanding contamination origins.

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Authors: Khadija Taroual, Mourad Nachtane, Marwane Rouway, Mostapha Tarfaoui, Abdessamad Faik, Viorel Mînzu, Karim Hilmi, and Dennoun Saifaoui This article explores the potential of using offshore wind and wave power in Morocco to generate green hydrogen through water electrolysis. By assessing the technical and economic feasibility in six coastal regions, the research identifies electricity generation estimates of 14 to 20 MW and hydrogen production potential of 20 to 40 tonnes annually. The proposed system, which integrates various energy technologies, demonstrates efficient performance with production costs that remain competitive. The findings indicate that this approach could diversify Morocco’s energy portfolio, enhance water resilience, and support sustainable development.

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Authors: Jiawei Wang, & Yan Zhang The article discusses the increasing importance of ensuring safety in maritime transportation of dangerous goods amid the advancement of China’s shipping industry. It emphasizes the need for a comprehensive safety evaluation index system specific to dangerous goods transportation by water. Focusing on Weihai City, the study establishes a set of primary, secondary, and tertiary evaluation indicators—environment, personnel, ships, goods, and management—leading to the development of a safety index system and proposing effective safety management measures to enhance the safe transport of hazardous materials.

36 - Human exposure to respiratory aerosols: Impact of ventilation rates, mixing ventilation configuration, and breathing patterns

Authors: Ihab Jabbar Al-Rikabi, Hayder Alsaad, Svenja Carrigan, Conrad Voelker This study explores the dynamics of airborne transmission in office settings with mixing ventilation (MV), focusing on how various ventilation configurations, air change rates (ACH), breathing patterns, and supply temperatures affect cross-exposure and infection risks. Using a controlled experimental setup, findings reveal that higher ACH does not guarantee improved exposure effectiveness while highlighting the superior performance of near-floor ventilation in reducing infection risk. Furthermore, it demonstrates that breathing patterns and supply temperatures significantly impact infection probabilities, ultimately guiding optimization of ventilation strategies for safer indoor environments.

41 - Laser Direct Infrared Spectroscopy: A cutting-edge approach to microplastic detection in environmental samples.

Authors: Prince Jebedass Isaac Chandran, S. Veerasingam Microplastic pollution is a significant global environmental issue impacting various ecosystems. As contamination levels rise, there is an increasing need for effective detection methods. This article reviews advancements in microplastic detection technologies, particularly emphasizing Laser Direct Infrared (LDIR) spectroscopy, which utilizes Quantum Cascade Lasers for rapid, sensitive, and automated detection. LDIR is notably advantageous over traditional methods, significantly reducing analysis time and capable of identifying microplastics as small as 10 m, making it essential for large-scale environmental monitoring despite some limitations.

02 - Potentialities of the combined use of underwater fluorescence imagery and photogrammetry for the detection of fi ne-scale changes in marine bioconstructors

Authors: Cristina Castagnetti, Paolo Rossi, Sara Righi, Stefano Cattini, Roberto Simonini, Luigi Rovati, and Alessandro Capra This paper explores the principles and methodologies of underwater photogrammetry, highlighting its applications, particularly in geological and ecological contexts. It emphasizes the significance of recent technological advancements, especially in drone-based Structure-from-Motion (SfM) photogrammetry, for creating detailed 3D models and conducting effective underwater surveying. The study evaluates the performance of different drones and an underwater camera for capturing high-resolution data in shallow waters, demonstrating the feasibility and advantages of these methods in various underwater environments.

12 - Habitat Classification of Temperate Marine Macroalgal Communities Using Bathymetric LiDAR

Authors: Richard Zavalas, Daniel Ierodiaconou, David Ryan, Alex Rattray, and Jacquomo Monk This study evaluated bathymetric LiDAR's potential for characterizing shallow water (<30 m) benthic habitats in high-energy subtidal coastal environments. Habitat classification of benthic substrata and macroalgal communities was achieved by combining LiDAR data, underwater video groundtruthing, and automated classification techniques using the Quick Unbiased Efficient Statistical Tree (QUEST) decision tree algorithm. Bathymetry and reflectance datasets were used to produce secondary terrain derivatives that influence benthic patterns. The resulting habitat maps showed overall accuracy exceeding 70%.

Authors: Joaquim Santos, Hans H. Jakobsen, Paul M. Petersen, and Christian Pedersen Plankton is vital for aquatic ecosystems by contributing to the biological carbon pump, yet climate change threatens these communities, necessitating their monitoring for ecosystem health assessment. Existing underwater imaging techniques are limited to small, fixed volumes, prompting the development of a novel scanning multispectral confocal LiDAR system. This system captures high-resolution 4D morphological and spectroscopic data, enabling AI models to classify microplastics by color and size and identify zooplankton and microalgae genera through in vivo autofluorescence.

28 - A Review of Subsidence Monitoring Techniques in Offshore Environments

Authors: Frank Thomas, Franz A. Livio, Francesca Ferrario, Marco Pizza, and Rick Chalaturnyk This article surveys subsidence monitoring systems for offshore oil and gas fields, addressing the growing global energy demand and the need for sustainable extraction. Subsidence poses significant risks to offshore infrastructure and the environment, necessitating careful monitoring. The review evaluates key technologies such as InSAR, GNSSs, hydrostatic leveling, and fiber optic cables, assessing their accuracy, applicability, and limitations within offshore operations. Based on an extensive review of over 60 publications and technical reports, the study concludes that no single method is universally optimal; rather, an integrated approach combining multiple techniques is most effective for reliable assessment.

Authors: Calebe Pereira Mendes, Norman T-Lon Lim Commercially available LiDAR scanners are expensive, limiting their use in research, especially in developing countries. To address this, a simple, affordable ground- based LiDAR scanner was designed and built costing under $400 (USD, 2021), which is easy to assemble with minimal engineering expertise. This scanner provides sufficient performance for various ecological research projects and produces quality point clouds for common LiDAR products. While its range is limited for large-scale mapping, the open-source, customizable design costs approximately 1% of market "low-cost" scanners, making LiDAR accessible for budget-constrained projects and opening new opportunities, particularly in developing nations.

30 - Underwater Temperature and Salinity Measurement by Rayleigh –Brillouin Spectroscopy Using Fizeau Interferometer and PMT Array

Authors: Yanpeng Zhao, Yuanqing Wang, Kun Liang, Yangrui Xu, Yuanxin Guo, and Kassim Makame This article introduces a LiDAR system employing a Fizeau interferometer and photomultiplier tube array to detect the water Rayleigh–Brillouin spectrum for simultaneous underwater temperature and salinity measurements based on Brillouin spectral linewidth and shift. Laboratory tests verified the system's efficiency, showing accurate retrieval of spectral backscattering profiles. After linear fitting and reconstruction, the system achieved temperature accuracy of ±0.13°C and salinity accuracy of ±0.16‰. By utilizing the multiparameter information contained in the Rayleigh–Brillouin spectrum, the system provides precise measurements, offering a valuable reference for marine remote sensing applications.

50 - Monitoring Aquatic Debris in a Water Environment Using a Remotely Operated Vehicle (ROV): A Comparative Study with Implications of Algal Detection in Lake Como (Northern Italy)

Authors: Jassica Lawrence, Nicola Castelnuovo, and Roberta Bettinetti This study used remotely operated vehicles (ROVs) to investigate underwater debris in a freshwater lake in 2019 and 2024, aiming to count and document visible metal and plastic items on the lakebed via video recordings. Observations showed 356 debris items in 2019 but only 39 in 2024, with the decrease likely due to dense algal growth impairing visibility. The research highlights monitoring challenges in freshwater systems during high algal activity, noting ROVs' effectiveness in clear water but limitations under reduced visibility from blooms and turbidity. Results offer insights into temporal debris visibility variations and support improved monitoring techniques.

44 - Prediction of operating offshore wind farms underwater noise from reanalysis of single point underwater noise measurement

Authors: Mahardika Firjatullah, Irsan Soemantri Brodjonegoro, and Farid Putra Bakti IOffshore wind turbines generate significant underwater noise that threatens marine life. Gearbox vibrations transmitted through the tower are the primary noise source. This study models turbines as Euler-Bernoulli beams and uses the CHIEF simulation method calibrated with field data from Utgrunden wind farm to accurately predict underwater noise. The cumulative noise from multiple turbines is detectable kilometers away, with constructive and destructive interference creating variable noise levels near the farm. This modeling approach enables optimization of wind farm layouts to minimize noise impacts on sensitive marine areas.

45 - Optimisation of island integrated energy system based on marine renewable energy

Authors: Wen Zhao, Bohong Wang, Ting Pan, Yujie Chen, Hengcong Tao, Baoying Guo, Petar Sabev Varbanov, Jinshu Lu Integrating marine renewable energy (MRE) with traditional energy sources is essential for solving energy issues on islands and achieving sustainable, low-carbon systems. This study reviews progress in marine energy conversion, grid integration, and storage technologies. It suggests using efficient, localized, and cost-effective integrated energy systems for islands, focusing on optimizing system performance with intelligent algorithms and forecasting methods. The goal is to improve marine energy efficiency in these systems.

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