Article
Oceanography
Hieu M. Nguyen, Karin R. Bryan, Zeng Zhou, Conrad A. Pilditch
Summary: This research demonstrates how the effect of exposure to air on intertidal flat profile development in cohesive coastal environments can be incorporated into applied numerical modelling. The findings show that the stabilizing effect of exposure leads to a more flat-topped shape of intertidal mudflats, and higher air temperatures have a greater impact on bed level change.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Environmental Sciences
Dunia Rios-Yunes, Tim Grandjean, Alena di Primio, Justin Tiano, Tjeerd J. Bouma, Dick van Oevelen, Karline Soetaert
Summary: Intertidal coastal sediments play a crucial role in nutrient transformation and storage, with sediment resuspension impacting nutrient release to the water column. In this study, in-situ sediment resuspension experiments were conducted in the Eastern and Western Scheldt estuaries, revealing predictable increases in ammonium and nitrite concentrations with greater erosion. However, phosphate dynamics differed between the two systems, with a decrease observed in the tidal bay and an increase in the estuarine sediments. This study highlights the varying effects of sediment resuspension on nutrient exchange in different tidal coastal environments.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Cherdvong Saengsupavanich, Lee Shin Yun, Lee Hin Lee, Sarinya Sanitwong-Na-Ayutthaya
Summary: This research investigates the impact of three major jetties in Thailand on alongshore sediment transport through field surveys and numerical simulations. The results show that these jetties intercept a significant amount of sediment, providing a basis for sand bypassing plans.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Dake Chen, Jinhai Zheng, Chi Zhang, Dawei Guan, Yuan Li, Huiming Huang
Summary: This study investigates the incipient motion condition of cohesive sediment considering particle aggregation using fractal theory and van der Waals force. A formula for the critical shear stress for surface erosion of cohesive sediments composed of fractal aggregates is developed, and the contribution rate of aggregate weight to erosion threshold is quantified.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Yang Zhao, Chunhong Hu, Xiaoming Zhang, Xizhi Lv, Xiaolin Yin, Zhaoyan Wang
Summary: The study found significant changes in sediment discharge of the Yellow River over the past 60 years, particularly in the main trunk stream and primary tributaries. The impact of soil and water conservation measures on sediment discharge is significant, with marginal benefit analysis indicating the influence of soil erosion control on sediment reduction benefits.
Article
Engineering, Civil
Henning Mohr, Scott Draper, David J. White, Liang Cheng
Summary: Erosion of marine sediments is complex and affected by various soil properties, with permeability playing a crucial role in determining the threshold shear stress. A new model has been introduced to predict the threshold shear stress based on permeability and erosion rate, which has been shown to explain experimental data and align with existing literature. This model is advantageous because it considers changes in bulk soil parameters and their impact on permeability, providing a comprehensive understanding of erosion resistance in different marine sediments.
COASTAL ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Ci-Jian Yang, Jens M. Turowski, Niels Hovius, Jiun-Chuan Lin, Kuo-Jen Chang
Summary: The study found that individual rainfall events in the badlands of SW Taiwan caused quantifiable landscape changes, with typhoon rain reducing hillslope gradients and lower-intensity precipitation either steepening or flattening the landscape. The observed steep topography may be due to the 2016 earthquake.
NATURE COMMUNICATIONS
(2021)
Article
Environmental Sciences
Zhe Wang, Min Lv, Chu-Long Huang, Dong-Dong Zhang, Ruixia Han, Gang Li, Ling-Xin Chen
Summary: This study found that anthropogenic activities, such as urbanization and oil combustion, have a significant impact on the distribution and properties of dissolved organic matter (DOM) in intertidal sediments. The release of organic matters from urbanization and the combustion of oil contribute to the higher concentration of aromatic compounds in the sediments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Oceanography
Ilgar Safak, Christine Angelini, Alex Sheremet
Summary: Boat traffic and resulting wakes are significant stressors on coastal ecosystems, increasing sediment transport and suspended sediment concentration in intertidal settings. The study confirms that boat wakes lead to higher sediment transport rates and suspended sediment concentration near the bed during periods of boat activity compared to boat inactivity.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Environmental Sciences
Hun Jun Ha, Ho Kyung Ha
Summary: Erosion of cohesive sediments in estuarine and intertidal environments remains a widely studied phenomenon. This study compared three methods for determining the surface erosion threshold, finding that the suspended sediment concentration method yielded lower values compared to the erosion rate and eroded mass methods. The research also identified spatiotemporal variations of erosion threshold values in intertidal flats using the eroded mass method.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Sun Min Choi, Jun Young Seo, Ho Kyung Ha
Summary: This study conducted field work to reveal the relationship between sediment erodibility and external forcing and the contribution of local erosion to sediment transport. Surface erosion under strong winds can cause sediment transport towards the sea, while particle erosion under weak winds increases the contribution of suspended sediment.
Article
Geosciences, Multidisciplinary
Shibing Zhu, Yining Chen, Weibing Yan, Fei Xing, Renzhi Li, Mingliang Li, Benwei Shi, Ya Ping Wang
Summary: A new mesoscale geomorphological unit, called hummocky patches, was discovered on the sand-mud mixed intertidal zone along the China coast. Hummocky patches significantly influence local sediment transport and their formation and development are driven by hydrodynamic forces.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Neurosciences
Jose Gomez-Tames, Keisuke Tani, Kazuya Hayashi, Satoshi Tanaka, Shoogo Ueno, Akimasa Hirata
Summary: This study aimed to quantify the internal electric field corresponding to perception and pain thresholds targeting the Broca's and M1 areas from magnetic stimulator exposure. The main finding is that the stimulation on the primary motor cortex has higher perception and pain thresholds when compared to Broca's area. The derived dosimetry quantities provide a scientific rationale for the development of human protection guidelines and the estimation of possible side effects of magnetic stimulation in clinical applications.
FRONTIERS IN NEUROSCIENCE
(2021)
Article
Environmental Sciences
M. B. Hailu, S. K. Mishra, S. K. Jain, V. P. Singh
Summary: Erosion is a significant problem caused by land cover change and inadequate land use worldwide. Soil conservation is a crucial solution to this issue, but it is challenging to implement in large basins without significant investment, especially for developing nations. Identifying erosion-prone regions and implementing necessary remedial measures are important for reducing investment costs and improving work efficiency.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Dake Chen, Jinhai Zheng, Chi Zhang, Dawei Guan, Yuan Li, Yigang Wang
Summary: The study investigates the erosion threshold of sand-mud mixtures by analyzing the momentum balance of particles in the bed surface, and develops a formula for the critical shear stress that also applies to pure sand and mud. The variation in critical shear stress over mud content is attributed to the varying dry bulk density of the mud component in the mixture. The developed formula accurately predicts the critical shear stress of sand-mud mixtures and pure mud during consolidation, offering a convenient application by relating critical shear stress to mud content and dry bulk density.
FRONTIERS IN MARINE SCIENCE
(2021)
Editorial Material
Geosciences, Multidisciplinary
Katrin Huhn, Karin R. Bryan
GEO-MARINE LETTERS
(2020)
Article
Ecology
Stephanie Mangan, Karin R. Bryan, Simon F. Thrush, Rebecca Gladstone-Gallagher, Andrew M. Lohrer, Conrad A. Pilditch
MARINE ECOLOGY PROGRESS SERIES
(2020)
Article
Geography, Physical
Benjamin K. Norris, Julia C. Mullarney, Karin R. Bryan, Stephen M. Henderson
Summary: The spatial variability in vegetation density controls sediment transport at sub-meter scales within a wave-exposed mangrove forest. Infragravity waves are likely drivers of sediment transport within the mangrove forest. Near-bed turbulent kinetic energy is correlated with bed level changes in both the mangrove forest and the unvegetated mudflat.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Geosciences, Multidisciplinary
Jennifer Montano, Giovanni Coco, Laura Cagigal, Fernando Mendez, Ana Rueda, Karin R. Bryan, Mitchell D. Harley
Summary: Shorelines respond to various drivers on different time-scales, with changes at longer time-scales often superimposed on shorter ones. A new approach using Complete Ensemble Empirical Mode Decomposition successfully predicted shoreline evolution from storm events to decadal timescales. By linking model drivers with shoreline position on multiple time-scales, the approach outperformed common shoreline models when using SLP and wave information. Prediction of shoreline changes over months, years, or decades remains a challenging task due to the complex interplay of different factors influencing beach dynamics.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geography, Physical
Erik M. Horstman, Karin R. Bryan, Julia C. Mullarney
Summary: The interaction between creek flow and sheet flow in a mangrove creek system plays a crucial role in driving tidal asymmetries and reducing high-water conditions.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Oceanography
Hemanth Vundavilli, Julia C. Mullarney, Iain T. MacDonald, Karin R. Bryan
Summary: A three-dimensional numerical model was developed to investigate drivers of sediment deposition in a mangrove-lined river delta. Based on an idealized domain representing the Firth of Thames in New Zealand, the study revealed that sediment deposition patterns are influenced by the presence of vegetation such as mangroves.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Geography, Physical
Peter J. de Ruiter, Julia C. Mullarney, Karin R. Bryan
Summary: The study reveals that wind plays a significant role in influencing velocity asymmetry in shallow tidal basins, with higher wind speeds leading to more extreme asymmetry patterns. Wind primarily affects mean and peak flow velocities in the basins, with limited impact on tidal harmonics. The depth-dependent velocity asymmetry patterns are most pronounced for wind speeds of 6 m/s and greater, and for wind directions parallel to the main axes of the basins' tidal channels.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Article
Geography, Physical
Hannah E. Glover, Debra J. Stokes, Andrea S. Ogston, Karin R. Bryan, Conrad A. Pilditch
Summary: This study investigates the impact of mangrove extent on the Waikaraka Estuary in Tauranga Harbor, New Zealand, using in-situ observations and numerical modeling. The results show that fine sediment is unlikely to be flushed out of the estuary after mangrove removal and the hydrodynamics are mainly controlled by tidal interactions with bathymetry rather than the presence of mangrove vegetation.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Article
Soil Science
A. G. Carshalton, M. R. Balks, T. A. O'Neill, K. R. Bryan, C. A. Seybold
Summary: The maximum seasonal depth of thaw in permafrost soils, known as the active layer depth, is influenced by various soil and atmospheric variables. Monitoring data from soil climate stations in the McMurdo Dry Valleys between 1999 and 2012 revealed significant variations in active layer depth and temperature at the top of the permafrost. However, there were no clear trends of increase or decrease during the period from 2000 to 2018. Wavelet analysis showed correlations between global and regional climate systems and de-seasonalized permafrost temperatures. Although the dataset is currently too short to draw conclusions about long-term changes, it serves as a valuable baseline for future assessments.
Article
Oceanography
Hieu M. Nguyen, Karin R. Bryan, Zeng Zhou, Conrad A. Pilditch
Summary: This research demonstrates how the effect of exposure to air on intertidal flat profile development in cohesive coastal environments can be incorporated into applied numerical modelling. The findings show that the stabilizing effect of exposure leads to a more flat-topped shape of intertidal mudflats, and higher air temperatures have a greater impact on bed level change.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Oceanography
J. M. Montgomery, K. R. Bryan
Summary: The extent of flood protection provided by mangrove forests varies due to differences in tree growth characteristics and local geomorphology. A model experiment in Tauranga, New Zealand, showed that the distribution and channelization of vegetation have a greater impact on flood attenuation than vegetation density. Additionally, a forest with sloping topography reduces the rate at which long wave attenuation occurs.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Fisheries
Karin R. Bryan, Benjamin T. Stewart, Alex M. Port, Hannah F. E. Jones, Conrad A. Pilditch
Summary: Estuaries are complex environments where catchment-derived contaminants interact with estuarine geomorphology and hydrodynamics. Biophysical modelling can help understand spatial variations in water quality, but decision-making based on specific details may be limited by nonlinear interactions and inherent constraints.
NEW ZEALAND JOURNAL OF MARINE AND FRESHWATER RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Amin Rahdarian, Karin R. Bryan, Mick Van der Wegen
Summary: This study examines the impact of initial bathymetry on the establishment of estuarine equilibrium and the response to sea-level rise. The findings highlight the importance of initial bathymetric conditions in predicting coastal response to changes such as sea-level rise.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Geosciences, Multidisciplinary
Christo Rautenbach, Julia C. Mullarney, Karin R. Bryan
Summary: Effective and accurate ocean and coastal wave predictions are crucial for engineering, safety, and recreational purposes. The study found that a computational node configuration of six threads/cores produced the most effective computational set-up for 1-week wave hindcasts. Further research is needed to understand the relationship between computational domain size and optimal parallel computational threads/cores for efficient simulations.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2021)