Article
Geosciences, Multidisciplinary
Jia-Hui Xie, Xue-Lin Shao, Kai Ma, Li Gao
Summary: Chaetomorpha linum can store a large amount of phosphorus and utilize it for growth when phosphate is abundant, and it can produce alkaline phosphatase and release mobile phosphorus from sediments when phosphate is deficient. The sources of phosphorus supporting the blooms of C. linum vary seasonally in Swan Lagoon.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Barbara P. Paiva, Carlos A. F. Schettini, Eduardo Siegle
Summary: The Sao Francisco River is an important river in Brazil, crossing the semi-arid region. A series of dams have been built along the river for hydropower, changing the flow significantly. A hydrodynamic model was used to simulate the effects of flow changes on saline intrusion in the estuary. The simulations showed an increase in mixing and decrease in river contribution after the dams were built. The results can be used by management agencies to improve water quality for human consumption.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
F. P. Brandini, A. M. Silver, A. Gangopadhyay
Summary: We demonstrate that wind-driven Ekman transport enhances the advection and mixing of cells, leading to the transport of colder water from the Surface Antarctic Waters to the warmer waters of the northern Polar Front belt. This mechanism provides cells with a favorable temperature environment, allowing for specific species and community growth rates to develop blooms under non-light limiting macronutrients and iron conditions. Our findings have important implications for increased productivity in a future warming climate.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
John E. Garzon-Cardona, Ana M. Martinez, Boris P. Koch, Bernd Krock, Elbio D. Palma, Xianyu Kong, Ruben J. Lara
Summary: This study aimed to gain a better understanding of the role of dissolved organic matter (DOM) in the biogeochemistry of the Southern Patagonian shelf. The results showed that terrigenous input is the main source of ammonium and refractory carbon in the region, while the Antarctic Circumpolar Current contributes autochthonous DOM. Additionally, regeneration processes of nitrogen-rich water were found in the Tierra del Fuego Waters and Grande Bay regions.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Jintao Gu, Yu Zhang, Pengfei Tuo, Zhiyuan Hu, Shengli Chen, Jianyu Hu
Summary: A group of self-developed surface drifters were released near the Pearl River Estuary (PRE), and it was found that most of them ended up stranded off the coast around Hainan Island after 10-30 days. The velocity of the drifters showed characteristics of tidal currents and was highly correlated to winter monsoon winds. A particle tracking model revealed that winds were the dominant factor affecting the movement of the floating objects, while non-wind-driven flows had limited influence. Tidal currents also played a significant role in the trajectory details. Further experiments showed that a high proportion of surface floaters from the PRE would converge around Hainan Island in autumn and winter.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Oceanography
Pernille Tonnesen, Shane Gero
Summary: Studying the behavior of deep-sea animals is challenging, but animal-borne camera tags may help understand predator-prey interactions. Research showed that camera-associated white light may affect foraging behavior, but has minimal long-term fitness impact on sperm whales. However, this impact should be considered and monitored for longer camera tag deployments.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2024)
Article
Oceanography
Alyssa M. LeClaire, Eric N. Powell, Roger Mann, Kathleen M. Hemeon, Sara M. Pace, Vincent Saba, Hubert du Pontavice, Jillian R. Sower
Summary: Arctica islandica is an important species for recording climate change on the U.S. northeast continental shelf, and its growth rates show synchronous changes with cold and warm climatic periods. This study finds that A. islandica near the Delmarva Peninsula had higher growth rates during cold periods, possibly due to increased food supply in shallower water. The range recession of this species is a long-term process determined by the survivorship of older individuals.
CONTINENTAL SHELF RESEARCH
(2024)
Article
Marine & Freshwater Biology
Jose Antonio Perez-Penalvo, Antonio Manuel Garcia-Mederos, Victor Manuel Tuset
Summary: In February 2020, a single individual of Atlantic spadefish was captured in the Canary Islands. Its morphology and external features were analyzed and described. This finding supports the hypothesis of a 'trans-Atlantic route' facilitated by oil platforms or ballast water in ships.
Article
Oceanography
Zhenjun Zheng, Guohai Dong, Huawei Dong, Xiaozhou Ma, Mingfu Tang
Summary: This study focuses on the methods for separating wind sea and swell in finite-depth waters, revealing the error caused by deep-water dispersion relationship in identifying wind sea and examining the impact of wave age thresholds on the partitioned results. Additionally, the study investigates the overshoot phenomenon criterion and its lag in capturing wind sea and the transition to young swell.
Article
Environmental Sciences
Ahmet Durap
Summary: This study uses nine machine learning methods to predict wave runup and takes into account a comprehensive range of coastal parameters. Non-linear models are found to be essential for accurate predictions, and the study identifies the influence of median sediment size, significant wave height, and foreshore beach slope on wave runup. The findings have important implications for designing resilient coastal structures and evaluating coastal hazard risks.
ANTHROPOCENE COASTS
(2023)
Article
Limnology
Malgorzata Strzalek, Lech Kufel, Karina Apolinarska, Marcin Becher, Elzbieta Biardzka, Michal Brzozowski, Rafal Kielczewski, Grzegorz Kowalewski, Andrzej Pukacz, Michal Woszczyk, Mariusz Pelechaty
Summary: This study analyzed the fate of inorganic carbon accumulated by Chara and Nitellopsis in six Polish lakes. The results showed that the efficiency of CaCO3 release varied between different species of these two genera. The study also found that lake water properties and overwintering patterns influenced the final loss of CaCO3.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Limnology
J. Karlsson, H. A. Verheijen, D. A. Seekell, D. Vachon, M. Klaus
Summary: The current estimates of CO2 evasion from Arctic lakes are highly uncertain due to the lack of studies that integrate seasonal variability, particularly during the spring ice-melt period. This study quantified the annual CO2 evasion in 14 clear-water Arctic lakes in Northern Sweden using mass balance and high-frequency loggers. The findings highlight the significance of measuring CO2 exchange during ice-melt for accurately estimating CO2 evasion from Arctic lakes.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Engineering, Marine
Hongdan Liu, Zhicheng Jia, Bing Li, Yan Liu, Zhigang Qi
Summary: This paper explores the monitoring and detection mechanism of vessel abnormal behavior based on Graph Attention Prediction and Reconstruction Network. It proposes a sliding window mechanism to generate fixed data input, effectively capturing the inter-dependencies among vessel behavior characteristics. The proposed mechanism dynamically adjusts the anomaly detection threshold based on variations in the marine environment, leading to an enhancement in the accuracy of detecting abnormal behavior in vessels.
Article
Engineering, Marine
Heath Palmer, Ming Zhao, Helen Wu, Pan Hu, Mohammad Rashed Mia, Chengwang Lei
Summary: This study investigates the improvement of hydrodynamic efficiency in dual chamber oscillating water columns (OWC) through numerical simulations. The results show that the dual chamber dual turbine configuration achieves higher efficiency compared to single chamber single turbine and dual chamber shared turbine configurations, operating over a broader range of wavelengths.
Article
Engineering, Marine
Ashok Kumar Pradhan, Ashok Kumar Barik, Manmatha Kumar Roul, Prafulla Kumar Swain
Summary: This study examines the tandem hydrofoil with two new flapping trajectories, elliptical and fishtail, to enhance induced thrust. Computational methods are used to analyze the hydrodynamic efficiency and the effects of Strouhal number and inter-foil spacing on the tandem hydrofoil.
Article
Engineering, Marine
Domenico Ferraro, Francesco Aristodemo, Agostino Lauria, Emilio Lazzaro, Davide Pasquali, Marcello Di Risio
Summary: This paper addresses the influence of waves on propeller jets in unconfined conditions, leading to alterations in scour and deposition patterns. Experimental tests and numerical simulations were conducted to investigate the effects of wave-induced velocity on the propeller jets hydrodynamics, providing insights into the complex bathymetry configuration induced by the propeller jet and waves.
Article
Engineering, Marine
Jingcheng Wang, Aijun Ye, Lianxu Zhou
Summary: This study reveals the ductile seismic behavior of scoured pile group foundations considering the pile uplift behavior. Quasi-static tests were conducted on reinforced concrete pile group specimens, and the experimental results were compared and discussed. The findings indicate that pile uplift reduces lateral strength and residual deformation, but increases displacement ductility of the foundation.
Article
Engineering, Marine
Pooya Rezadoost, Hossein Nassiraei
Summary: This study focuses on identifying the most suitable probability distribution models for the ultimate strength of FRP-strengthened X-shaped tubular joints under axial loads. The accuracy of finite element models is verified through comparisons with experimental results, and extensive analyses are conducted to generate reliable datasets. The findings indicate that the Generalized Extreme Value distribution and the Burr distribution are the best models for characterizing the ultimate strength under compressive and tensile axial loads, respectively. The probability differences between the proposed models for compressive and tensile loads are minimal, enhancing the reliability and confidence in predicting the behavior and performance of these joints.
Article
Engineering, Marine
Minji Kim, Vladas Pipiras, Arthur M. Reed, Kenneth Weems
Summary: This study addresses the problem of obtaining forces for lower-fidelity models by regressing forces from higher-fidelity models, and provides numerical simulations for verification.
Article
Engineering, Marine
Jongdae Jung, Jeonghong Park, Yeongjun Lee, Tae-Kyeong Yeu, Jinwoo Choi, Jong-bu Han
Summary: In this study, a structural monitoring system using an autonomous surface vehicle (ASV) is proposed for inspecting offshore power plants in harsh ocean conditions. The ASV incorporates navigation sensors to accurately estimate its motion in ocean disturbances and is equipped with multi-modal sensors for mapping underwater and surface structures. The system also utilizes outlier removal methods to improve mapping performance.
