Article
Geography, Physical
Ivan Pascal, Christophe Ancey, Patricio Bohorquez
Summary: This study conducted flume experiments to investigate the variability of antidune geometry and migration celerity, and found that migration celerity increased with increasing antidune wavelength, showing a general dimensionless relationship between the two. Additionally, antidunes were more uniform and migrated faster for higher sediment feeding rates.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Geosciences, Multidisciplinary
Santiago J. Benavides, Eric Deal, Matthew Rushlow, Jeremy G. Venditti, Qiong Zhang, Ken Kamrin, J. Taylor Perron
Summary: The study discusses how sediment transport near the threshold of grain motion is influenced by rare transport events, making it difficult to calibrate sediment transport laws and define a clear threshold for grain entrainment. The research presents a model to capture this intermittency and utilize noisy statistics of sediment transport to predict the sediment entrainment threshold and fluid stress variations. The findings suggest strategies for improving measurements and predictions of sediment flux and hint at potential changes in the sediment transport law near the threshold of motion.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Civil
Hassan Ismail, Ming Xiao, Sajjad Salam, Bryan Scholl, Xiaofeng Liu
Summary: Understanding the erodibility of sand infill through densely vegetated engineered turf on steep slopes is crucial for ecological restoration and conservation projects. Flume testing revealed that the bed material gradation became coarser during subsequent flows, and poorly sorted infill soils underwent noticeable changes to gradation. The study proposed an updated formulation for predicting sediment flux based on effective bed shear stress and dimensionless parameters, resulting in greatly improved predictions.
JOURNAL OF HYDRAULIC ENGINEERING
(2021)
Article
Mechanics
Jyotirmoy Barman, Bimlesh Kumar
Summary: Bank angle and floodplain vegetation emergence have significant effects on flow characteristics in a compound channel. The presence of vegetation influences the slopes and nearby region, acting as an intermediary between the main channel and floodplain. Anisotropic invariant map analysis reveals the dominance of the transverse component in slopes. Steeper bank angles result in higher velocities and greater instability compared to gradual bank slopes. The presence of higher floodplain vegetation emergence increases shear stress and turbulent kinetic energy on the slopes, indicating their higher vulnerability. This study is important for hydraulic engineering to understand bank failure and methods to maintain stability.
Article
Water Resources
Songbai Wu, Ting Fong May Chui, Li Chen, Chun Hon Christopher Chow
Summary: The effects of slope on sediment trapping in vegetative filter strips (VFS) have been neglected in current modelling practices, which hampers VFS design and performance evaluation, especially on steep slopes. To address this knowledge gap, 12 laboratory experiments were conducted to investigate sediment trapping in VFS under different inflow discharge and slope angles. The results show that sediment particles can be eroded again on steep slopes, leading to decreased sediment trapping efficiency in VFS. A modelling framework was developed to simulate sloped VFS, which showed good agreement with the experimental results.
HYDROLOGICAL PROCESSES
(2023)
Article
Environmental Sciences
Khabat Khosravi, Amir Hooshang Nezamivand Chegini, James Cooper, Luca Mao, Mahmood Habibnejad, Kaka Shahedi, Andrew Binns
Summary: Research suggests that non-uniform sediment mixtures from dam break flows have different mobility compared to uniform sized sediment. Coarse fractions are more erodible while fine fractions are more stable. Changes in reservoir water levels also impact the mobility of mixed-size fractions transported on the bed.
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2021)
Article
Multidisciplinary Sciences
Libo Chen, Pengyu Gao, Xiaolin Li, Qin Zhu, Zumei Wang, Fang Shuai, Yue Zhang, Jinshi Lin, Yanhe Huang, Fangshi Jiang
Summary: The detachment-transport coupling equation by Foster and Meyer is a classical equation that describes the relationship between detachment and transport. It quantifies the relationship between sediment loads and soil detachment rates, and provides a reliable basis for erosion modeling. However, its applicability to slopes with gradients greater than 47% is limited.
Article
Geosciences, Multidisciplinary
Thomas C. Ashley, Suleyman Naqshband, Brandon McElroy
Summary: This study provides a kinetic interpretation of the transition between microform and mesoform, indicating a critical shift in particle behavior with increasing importance of particle collisions. It also demonstrates that continuum-based morphodynamic models become permissible at the most unstable wavelength predicted from linear stability theory, linking descriptive and mathematical theories of bedform initiation.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Engineering, Geological
Wei Hu, Yangshuai Zheng, Mauri Mcsaveny, Qiang Xu, Theo van Asch
Summary: This study conducted flume experiments to simulate rock avalanches overriding a saturated bed material. The experimental results showed that the overriding flow fluidized the bed material into a viscous state. The rapid loading by the overriding debris led to an increase in pore pressure at the bottom and the bed material exhibited shear-thinning rheology. This finding provides a possible natural explanation of the hypermobility of rock avalanches and can improve the accuracy and reliability of numerical simulation.
ENGINEERING GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jeffrey E. Larimer, Elowyn M. Yager, Brian J. Yanites, Alex J. C. Witsil
Summary: This study conducted flume experiments to investigate the dependence of saltating gravel impact dynamics on transport stage and bed topography. The findings suggest that nonplanar bed has a more complex distribution of impact energy with a greater number of rare highly erosive impacts. Probabilistic formulations of particle trajectories better predict changes in erosion rate across experiments than deterministic regression equations.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Environmental Sciences
Veronica Carrillo, John Petrie, Luis Timbe, Esteban Pacheco, Washington Astudillo, Carlos Padilla, Felipe Cisneros
Summary: The study introduced an experimental procedure to determine bedload sediment transport rates in channels with high gradients and coarse sediment. Through laboratory experiments, a mathematical bedload transport model was established, showing agreement with some models in existing literature. The closest match was found with models developed for steep slopes considered in the study.
Article
Geosciences, Multidisciplinary
Xuan-hao Wang, Wei Cui, Gui-ke Zhang, Hong Yang
Summary: By using UAV photogrammetry, a rapid identification method for rocky ledges is proposed, which reduces risk and improves efficiency.
Article
Geosciences, Multidisciplinary
Elizabeth H. Dingle, Jeremy G. Venditti
Summary: River bed sediments often lack fine gravel between 1 and 5 mm, a phenomenon referred to as the grain size gap. This study investigated the behavior of grain size gap material during the gravel-sand transition. It was found that the presence of sand deposition enhanced the mobility of gap gravel, suggesting that gap particles may be transported to other environments.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Environmental Sciences
Haoliang Wu, Nian-Sheng Cheng, Yee-Meng Chiew
Summary: This study experimentally examines bed-load transport in the presence of emergent vegetation using uniformly sized circular cylinders. It proposes a model to evaluate bed-load transport rate based on scour holes around vegetation stems, considering spatial variability and turbulence effects. The derived formula is applicable for predicting bed-load transport rate in vegetated flows under weak to moderate transport conditions.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Yu-wei Gong, Hai-jun Yu, Pei Tian, Wen-zhao Guo, Lin Chen, Ding-tao Shen
Summary: Grass recovery is commonly used in the loess area of China for erosion control, but the effects of grass cover on runoff erosion dynamics on steep loess hillslopes are still not clear. This study focused on quantifying the effects of canopies and roots on controlling slope runoff and erosion using a typical forage species in semiarid areas (Coreopsis).
JOURNAL OF MOUNTAIN SCIENCE
(2023)
Article
Water Resources
Andre Paquier, Pierre Henri Bazin, Kamal El Kadi Abderrezzak
URBAN WATER JOURNAL
(2020)
Article
Geography, Physical
C. Misset, A. Recking, C. Legout, M. Bakker, N. Bodereau, L. Borgniet, M. Cassel, T. Geay, F. Gimbert, O. Navratil, H. Piegay, N. Valsangkar, M. Cazilhac, A. Poirel, S. Zanker
Article
Geosciences, Multidisciplinary
Maarten Bakker, Florent Gimbert, Thomas Geay, Clement Misset, Sebastien Zanker, Alain Recking
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2020)
Article
Computer Science, Interdisciplinary Applications
Mezbache Salheddine, Paquier Andre, Hasbaia Mahmoud
JOURNAL OF HYDROINFORMATICS
(2020)
Article
Geosciences, Multidisciplinary
C. Misset, A. Recking, C. Legout, B. Viana-Bandeira, A. Poirel
Summary: The study conducted in 7 Alpine catchments reveals that fine particles can be present in significant quantities in the subsurface layer of river beds even when the surface contains none, impacting suspended load modeling and river management. The stocks highly depend on facies, suggesting strong influence from local hydraulics and river bed characteristics. This highlights the significance of interactions between suspended particles and gravel beds in large alluvial sections typically found in Alpine environments.
Article
Geosciences, Multidisciplinary
C. Misset, A. Recking, C. Legout, M. Bakker, F. Gimbert, T. Geay, S. Zanker
Summary: The transportation of fine sediment is influenced by various factors such as different modes of transport and sediment sources. A study in an Alpine catchment over two years revealed a seasonal control exerted by river bed mobility and snow cover on suspended sediment dynamics. The potential shift of sediment dynamics from river bed to hillslope dominated in the context of global warming was also questioned.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Mathieu Cassel, Jerome Lave, Alain Recking, Jean-Rene Malavoi, Herve Piegay
Summary: Experimental study reveals that particle shape in bedload transport models in rivers has a greater influence on the resting time and mean traveling distance of particles than particle density. The analysis shows that particle shape significantly affects travel distances, with a strong correlation to the Sneed and Folks shape index, highlighting the importance of considering particle shape in bedload transport models.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Civil
Costanza Carbonari, Alain Recking, Luca Solari
Summary: The study presents a simple image analysis technique for measuring sediment composition in flume experiments, utilizing color detection to analyze sediment fractions of different sizes. The technique was applied in three experiments to investigate channel morphology, sediment sorting, and bedload transport, providing valuable insights for these research areas.
JOURNAL OF HYDROLOGY
(2021)
Article
Water Resources
Tariq Chibane, Andre Paquier, Saadia Benmamar
Summary: The study investigates flow patterns in a street, finding that overflow significantly increases streamwise velocity and turbulence, which could validate CFD models for various flooding conditions.
URBAN WATER JOURNAL
(2021)
Article
Environmental Sciences
John Pitlick, Alain Recking, Fred Liebault, Clement Misset, Guillaume Piton, Daniel Vazquez-Tarrio
Summary: Global compilations of river sediment loads show that mountainous areas contribute significantly to the sediment transported to the oceans. This study focused on estimating the contemporary sediment loads of 16 gravel bed rivers draining the Ecrins-Pelvoux Massif in southeast France. The results indicate a linear relationship between bed load fluxes at channel-forming flows and downstream increases in discharge, as well as a linear scaling of annual sediment loads with drainage area.
WATER RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
M. Nasr, T. Geay, S. Zanker, A. Recking
Summary: Monitoring bedload transport is important for studying river morphology evolution and hydraulic structures stability. However, the lack of theoretical background linking recorded acoustic noise to bedload and river characteristics hinders a full understanding of experimental results. A model was developed to estimate the acoustic noise generated by bedload transport, showing varying prediction errors between different rivers, likely due to inaccuracies in predicting particle trajectory and velocity.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Geography, Physical
Alain Recking, Daniel Vazquez Tarrio, Guillaume Piton
Summary: During the past 20 years, research has shown that grain sorting plays a significant role in bed-level fluctuations and pulses of sediment transport. In this study, a new analysis of flume and field experiments is proposed, resulting in a model that considers the fluctuation of local slope and bedload in gravel-bed rivers. The model is compared with field data and provides insights into scour-fill processes and highly concentrated bedload transport events in mountain streams.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geosciences, Multidisciplinary
M. Piantini, F. Gimbert, E. Korkolis, R. Rousseau, H. Bellot, A. Recking
Summary: Sediment flows generate ground vibrations through force fluctuations on the riverbed. However, linking force fluctuations to properties of highly concentrated sediment flows is challenging due to complexities from grain-to-grain interactions. In this study, downscaled flume experiments are conducted to measure force fluctuations, local seismic vibrations, and flow properties of highly concentrated sediment flows at high resolution. It is observed that force fluctuations exhibit hysteresis behaviors with flow surface elevation and mass, while having a unique negative relationship with solid concentration. The findings suggest that solid concentration should be incorporated as a key parameter in seismic models of such sediment flows.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Miguel Angel Mejia-Morales, Emmanuel Mignot, Andre Paquier, Sebastien Proust
Summary: The increasing occurrence of urban flooding emphasizes the need for more accurate flood hazard assessment. This study focuses on understanding the hydraulic processes in urban flood flows through a laboratory experiment. The experiment simulates an urban area consisting of a city block and surrounding streets. The results show that the unsteadiness of the inflow hydrograph significantly impacts the floodwater volume stored within the city block. Increasing storage capacity leads to reduced peak outflow discharge, decreased flow depths, and increased velocities in some areas.
WATER RESOURCES RESEARCH
(2023)
Article
Geography, Physical
Marco Piantini, Florent Gimbert, Herve Bellot, Alain Recking
Summary: This study investigates how loose debris produced by mass-wasting processes in the upper part of mountain river catchments accumulates at the base of slopes and cliffs, leading to the generation and propagation of sediment pulses. The findings show that the ability of the self-formed deposits to generate sediment pulses is influenced by the fine fraction of the mixture, and seismic measurements reveal the dominance of the front in overall seismic noise.
EARTH SURFACE DYNAMICS
(2021)
