Article
Environmental Sciences
J. R. Cox, Y. Huismans, S. M. Knaake, J. R. F. W. Leuven, N. E. Vellinga, M. van der Vegt, A. J. F. Hoitink, M. G. Kleinhans
Summary: Deltas and estuaries worldwide are facing the challenge of capturing sufficient sediment to keep up with relative sea-level rise. Anthropogenic interventions in the urbanized Rhine-Meuse Delta of the Netherlands have led to a negative sediment budget since the 1980s. The increase in dredging activities in ports and harbors, as well as changes in sediment composition, have important implications for navigation, ecology, flood safety, and management of sediment in the system.
Article
Geosciences, Multidisciplinary
Shanshan Deng, Junqiang Xia, Xin Liu, Meirong Zhou, Yu Mao, Quanxi Xu
Summary: After the operation of the Three Gorges Project, the sediment transport in the Middle Yangtze River has shifted from upstream input to fluvial erosion and tributary input. Fine sediment mainly comes from upstream and tributaries, while coarse sediment primarily comes from bed and bank erosion. The river system has transformed from transport-limited to supply-limited, with future sediment supply rate decreasing due to river regulation works.
Article
Environmental Sciences
Zhenchang Zhu, Tjeerd J. Bouma, Qin Zhu, Yanpeng Cai, Zhifeng Yang
Summary: This study evaluated the response of cordgrass seed bank dynamics to changing physical disturbance at tidal flats, revealing that wave disturbance reduced the persistence of seeds on the surface, while amplified sediment disturbance lowered the persistence of both surface and buried seeds. This indicates that increasing storminess and associated sediment variability under climate change threatens seed bank persistence in tidal flats.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Eduardo S. Morais, Otavio C. Montanher
Summary: This study investigates the avulsion process and its influencing factors in the lower course of the Peixe River in southeastern Brazil. Using remote sensing and fieldwork measurements, the morphological changes in the channels and floodplain features were evaluated. It was found that the width variation of the floodplain regulated the extent of the avulsion, and significant differences in sinuosity and bank elevation were observed. Sedimentary analyses revealed distinct deposits with varying characteristics and organic matter concentration.
Article
Environmental Sciences
Anna-Karin Dahlberg, Karin Wiberg, Ian Snowball, Alizee P. Lehoux
Summary: Deposits of contaminated wood fiber waste have been found in boreal countries and in-situ isolation capping has been proposed as a remediation solution. However, knowledge about the performance of such caps on soft, gaseous organic rich sediment is scarce. This study investigated the effectiveness of in-situ capping on limiting POPs fluxes from contaminated fibrous sediments that produce gas.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Louis Gilet, Frederic Gob, Emmanuele Gautier, Clement Virmoux, Nathalie Thommeret, Geoffrey Houbrechts
Summary: This study aims to understand the mechanisms underlying the influence of dams on downstream bedload transport in gravel-bed rivers in the Morvan massif, France. The results show that dams have varying degrees of impact on the flood regime and downstream morphology, which significantly affect bedload transport.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Geosciences, Multidisciplinary
A. Nicosia, C. Di Stefano, V Pampalone, V Palmeri, V Ferro
Summary: Theoretical deduced flow resistance equation was tested for overland flow under equilibrium sediment transport conditions, with errors less than or equal to +/- 5%. The analysis demonstrated that the coefficient increases with the transportability of soil particles, associated with a decrease in both flow energy required for sediment transport and the Darcy-Weisbach friction factor.
Article
Environmental Sciences
Vito Ferro, Alessio Nicosia
Summary: This paper tests the applicability of a theoretical flow resistance law to sediment-laden flow in pipes by deriving velocity profile and flow resistance law using incomplete self-similarity theory. It calibrates parameters using measurements data and establishes relationships between parameters. The procedure to estimate Darcy-Weisbach friction factor is tested through available measurements.
Article
Mechanics
Hugo Rousseau, Remi Chassagne, Julien Chauchat, Raphael Maurin, Philippe Frey
Summary: Gravity-driven size segregation plays a key role in mountain streams, where vertical size segregation affects river bed morphology through interactions at the particle scale. Models based on granular forces have successfully bridged the gap between grain-scale physics and continuum modeling. Investigation of granular forces reveals scaling of advection and diffusion coefficients with inertial number and proposed scaling relationships for segregation force.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Environmental Sciences
Kate L. Mathers, Carmen Kowarik, Cristina Rachelly, Christopher T. Robinson, Christine Weber
Summary: The study found that sediment traps can significantly disrupt the sediment regime in mountain streams, with important consequences for instream ecology and environmental conditions. Sediment traps may lead to non-uniform grain size distribution, reduced substrate diversity, and altered macroinvertebrate community composition.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Seo Yeol Choi, Ho Young Soh, Kyoungsoon Shin, Seung Won Jung, Min-Chul Jang
Summary: Global warming is causing hypoxic regions to increase, which is affecting marine ecosystems worldwide. A study conducted in the southern coast of Korea found that hypoxia has negative effects on the eggs of copepods in the order Calanoida. The abundance of calanoid eggs was higher in hypoxic areas compared to normoxic areas, and a significant proportion of the eggs exhibited abnormalities.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Yougong Li, Ming Chen, Jilai Gong, Biao Song, Maocai Shen, Guangming Zeng
Summary: The research revealed that the presence of MPs in river sediments reduces the adsorption capacity of sediments to Cd (II) and accelerates the transport of Cd (II) in sediments.
Article
Engineering, Marine
Toni Llull, Anna Mujal-Colilles, Xavier Gironella
Summary: This study presents a new set of experiments on local scour caused by confined twin propeller jets, incorporating propeller driving characteristics into the analysis. The results show that the distance to the vertical wall is the main factor contributing to higher scour depths, rather than propeller speed or bed clearance. Additionally, two empirical models are proposed based on different rotation regimes.
Article
Mechanics
Markus Scherer, Markus Uhlmann, Aman G. Kidanemariam, Michael Krayer
Summary: The study reveals the connection between the formation of subaqueous sediment ridges and the lateral organization of large-scale streaks, with ridges mostly appearing below large-scale low-speed streaks. The adaptation of sediment bedforms to changes in the outer flow with a time delay is described as a 'top-down' process. The presence of mean secondary currents of comparable intensity and spacing over sediment ridges and smooth-wall channels indicates the influence of regularly organized large-scale streaks.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Economics
Felipe Bedoya-Maya, Joris Beckers, Edwin van Hassel
Summary: This paper examines the inland container throughput in the RhineAlpine Corridor and reveals spatial concentration patterns and economic spillover effects. The study finds that technological resources and population density have a positive impact on throughput, while employment and motorways have a negative impact. The paper suggests spatially oriented policies to address issues related to low water levels, declining workforce, and the need for new business models.
JOURNAL OF TRANSPORT GEOGRAPHY
(2023)
Article
Environmental Sciences
Kurt Glock, Michael Tritthart, Helmut Habersack, Christoph Hauer
Article
Environmental Sciences
Christoph Hauer, Petr Lichtneger, Jacob Holzinger, Johannes Schobesberger, Helmut Habersack, Christine Sindelar
RIVER RESEARCH AND APPLICATIONS
(2019)
Article
Environmental Sciences
Michael Tritthart, Marlene Haimann, Helmut Habersack, Christoph Hauer
RIVER RESEARCH AND APPLICATIONS
(2019)
Article
Green & Sustainable Science & Technology
Beatrice Wagner, Christoph Hauer, Helmut Habersack
CURRENT OPINION IN ENVIRONMENTAL SUSTAINABILITY
(2019)
Article
Environmental Sciences
Petr Lichtneger, Christine Sindelar, Johannes Schobesberger, Christoph Hauer, Helmut Habersack
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2020)
Article
Engineering, Civil
Johannes Schobesberger, Petr Lichtneger, Christoph Hauer, Helmut Habersack, Christine Sindelar
JOURNAL OF HYDRAULIC ENGINEERING
(2020)
Article
Environmental Sciences
Daniel Wildt, Christoph Hauer, Helmut Habersack, Michael Tritthart
Article
Environmental Sciences
Sencer Yuecesan, Daniel Wildt, Philipp Gmeiner, Johannes Schobesberger, Christoph Hauer, Christine Sindelar, Helmut Habersack, Michael Tritthart
Summary: Through Large Eddy Simulation, this study systematically investigated the variation of exposure level of multiple spherical particles in a high Reynolds number turbulent open-channel flow regime, revealing a bi-modal distribution for fully exposed particles due to the effect of very-large-scale motion of coherent structures on lift force, while lower exposure levels exhibited a uni-modal distribution.
Article
Engineering, Civil
Johannes Schobesberger, Dominik Worf, Petr Lichtneger, Sencer Yuecesan, Christoph Hauer, Helmut Habersack, Christine Sindelar
Summary: This study experimentally investigates entrainment events of a single sediment particle on a smooth bed in open channel flow. Tomographic particle tracking velocimetry system and shake the box algorithm were used to determine flow velocities, while proper orthogonal decomposition method was applied to identify motions carrying the most turbulent kinetic energy.
JOURNAL OF HYDRAULIC RESEARCH
(2022)
Article
Water Resources
Daniel Wildt, Christoph Hauer, Helmut Habersack, Michael Tritthart
Summary: In this study, a Euler-Lagrangian two-way coupled large eddy simulation was used to model the development of sediment plume. The momentum exchange was calculated based on interaction forces in the Maxey-Riley equation. The results were validated against experimental data and showed good agreement. The analysis revealed three phases of sediment plume development: acceleration, transport, and deposition. The significant slowing down of fluid flow and particle sorting were identified as important processes in the initial development of sediment plume, which are not accounted for in one-way coupled models.
ADVANCES IN WATER RESOURCES
(2022)
Article
Engineering, Civil
Sencer Yucesan, Johannes Schobesberger, Christine Sindelar, Christoph Hauer, Helmut Habersack, Michael Tritthart
Summary: A Large Eddy Simulation was conducted to study coherent structures in a fully developed turbulent open-channel flow. The forces acting on a stationary sediment particle were computed to predict the particle motion using the impulse concept. The results showed outward and sweep events in high impulse quadrant analyses. The correlation between hydrodynamic forces and the flow field was analyzed. It was found that large, long-lived hairpin-like vortices with bed-normal lengths larger than approximately 100 viscous units increased both lift and drag forces, facilitating the initiation of particle motion.
JOURNAL OF HYDRAULIC RESEARCH
(2022)
Article
Mechanics
Dominik Worf, Ali Khosronejad, Thomas Gold, Kevin Reiterer, Helmut Habersack, Christine Sindelar
Summary: The study investigated the behavior of a subaqueous cylindrical pendulum and corresponding flow dynamics, finding that two-dimensional model equations were able to capture three-dimensional dynamics. Three-dimensional vortical flow structures were observed during the experiments.
Article
Environmental Sciences
Markus Eder, Francesca Perosa, Severin Hohensinner, Michael Tritthart, Sabrina Scheuer, Marion Gelhaus, Bernd Cyffka, Timea Kiss, Boudewijn Van Leeuwen, Zalan Tobak, Gyorgy Sipos, Nandor Csikos, Anna Smetanova, Sabina Bokal, Andrea Samu, Tamas Gruber, Andreea-Cristina Galie, Marinela Moldoveanu, Petrisor Mazilu, Helmut Habersack
Summary: This paper presents methods to identify active, former, and potential floodplains, and their application to the Danube River. The extent of Danube floodplains has been reduced by around 79%. The share of active and potential floodplains in relation to former floodplains ranges between 5% and 49%.
Article
Mechanics
S. Yuecesan, D. Wildt, P. Gmeiner, J. Schobesberger, C. Hauer, C. Sindelar, H. Habersack, M. Tritthart
Summary: Studies on turbulent flows over heterogeneous surfaces have found increased turbulent kinetic energy and Reynolds shear stress in low-momentum-path regions, which induce large-scale multi-cellular secondary flows. This study aims to analyze the influence of these regions on drag, lift, and lateral forces acting on spherical particles at different exposure levels, specifically investigating the contribution of spanwise inhomogeneities. Numerical simulations of turbulent open-channel flow with varying aspect ratios over single-sized spherical particles were conducted, revealing large-scale secondary flows in between the particles and backflow at the trailing edge. It was also observed that drag forces are higher in high-momentum-path regions due to larger streamwise pressure gradients.
Editorial Material
Water Resources
Helmut Habersack, Marcel Liedermann, Michael Tritthart, Markus Eder
INTERNATIONAL JOURNAL OF RIVER BASIN MANAGEMENT
(2020)