Results 51 to 60 of about 600 (156)

Metrics for the Quantification of Seeding Characteristics to Enhance Image Velocimetry Performance in Rivers

Remote Sensing, 2020
River flow monitoring is essential for many hydraulic and hydrologic applications related to water resource management and flood forecasting. Currently, unmanned aerial systems (UASs) combined with image velocimetry techniques provide a significant low ...
Silvano Fortunato Dal Sasso, Alonso Pizarro, Salvatore Manfreda   +2 more
doaj   +1 more source

Floodplain Vegetation Density Effects on Meandering Channel Flow Patterns and Channel‐Floodplain Hydraulic Exchange

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 7, July 2025.
Abstract Channel‐floodplain flow interactions are strongly influenced by riparian vegetation characteristics. However, due to the complicated relationships among floods, vegetation, and channel morphodynamics, these interactions are poorly understood. In this study, we investigate the influence of the density of rigid floodplain vegetation on flow in ...
Daniel C. White, Ryan R. Morrison, Peter A. Nelson   +2 more
wiley   +1 more source

Gravel Replenishment Downstream of Dams: Insights From a Flume Experiment in a Straight Embanked Channel

Water Resources Research, Volume 61, Issue 6, June 2025.
Abstract Gravel replenishment (GR) is a common strategy to mitigate the negative effects of sediment deficit caused by dam regulation. However, its effectiveness in restoring dam‐regulated embanked gravel‐bed rivers with alternate bars is still unclear.
Junjian Deng, Guillaume Brousse, Magali Jodeau   +2 more
wiley   +1 more source

On the Uncertainty of the Image Velocimetry Method Parameters

Hydrology, 2020
Image velocimetry is a popular remote sensing method mainly because of the very modest cost of the necessary equipment. However, image velocimetry methods employ parameters that require high expertise to select appropriate values in order to obtain ...
Evangelos Rozos, Panayiotis Dimitriadis, Katerina Mazi, Spyridon Lykoudis, Antonis Koussis   +4 more
doaj   +1 more source

Understanding Tidal Jet Vortices Over Complex Bathymetry via Numerical Modeling and Drone Observation: Match and Mismatch in the Vortex Dynamics Under Idealized and Realistic Topographic Settings

Journal of Geophysical Research: Oceans, Volume 129, Issue 12, December 2024.
Abstract The formation and evolution of tidal jet vortices over complex bathymetry were investigated using numerical modeling and in situ observation. Delft3D FM simulation on an unstructured grid system, complemented by field measurements using recreational drones captured tidal dynamics in the Uldolmok Strait, known for its strong tidal currents up ...
Sooncheol Hwang, Byoungjoon Na, Sangyoung Son   +2 more
wiley   +1 more source

Enhancement of two‐dimensional hydrodynamic modelling based on UAV‐ flow velocity data

Earth Surface Processes and Landforms, Volume 49, Issue 9, Page 2736-2750, July 2024.
We calibrated a 2D hydrodynamic model with three calibration sets and used UAV‐derived surface flow velocities and fixed velocity coefficients in an extensive cross‐validation and velocity conversion procedure. Performance varied between straight and meandering river reach, with bathymetry and distance to the channel centre as key factors.
Franziska Wolff, Eliisa Lotsari, Diana Spieler, Melanie Elias, Anette Eltner   +4 more
wiley   +1 more source

Combining hydroacoustics and large-scale particle image velocimetry: Flow dynamics at Hiitolanjoki River restoration site in Southeast Finland

Journal of Hydrology: Regional Studies
Study region: Finland’s largest dam removal project at Hiitolanjoki River restoration site provides a unique opportunity to assess the hydraulic impacts of river restoration.
Kerstin Schlobies, Juha-Matti Välimäki, Tuure E. Takala, Marko Kärkkäinen, Anton Kuzmin, Eliisa S. Lotsari   +5 more
doaj   +1 more source

The impacts of low flow, ice‐cover and ice thickness on sediment load in a sub‐arctic river – Modelling sediment transport with particle image velocimetry calibration data sets

Earth Surface Processes and Landforms, Volume 49, Issue 6, Page 1954-1968, May 2024.
Image‐based river sediment transport simulations show a significant decrease in flow velocity and sediment load in ice‐covered river conditions compared to open‐water low‐flow conditions. When an additional increase in ice thickness was simulated, bedload increased because the thicker ice narrowed the river channel substantially.
Virpi Pajunen, Eliisa Lotsari, Juha‐Matti Välimäki, Franziska Wolff, Marko Kärkkäinen, Linnea Blåfield, Anette Eltner   +6 more
wiley   +1 more source

Assessment of 3D-RANS models for the simulation of topographically forced shallow flows

Journal of Hydrology and Hydromechanics, 2016
In this work the performance of Reynolds Averaged Navier-Stokes (RANS) simulations to predict the flow structure developed by the presence of a sidewall obstacle in a uniform open-channel shallow flow is discussed. The tested geometry was selected due to
Safarzadeh Akbar, Brevis Wernher
doaj   +1 more source

2D and 3D Computational Modeling of Surface Flooding in Urbanized Floodplains: Modeling Performance for Various Building Layouts

Water Resources Research, Volume 60, Issue 5, May 2024.
Abstract Understanding the strengths and limitations of the modeling capacity of surface flooding in urbanized floodplains is of utmost importance as such events are becoming increasingly frequent and extreme. In this study, we assess two computational models against laboratory observations of surface urban flooding in a reduced‐scale physical model of
Xuefang Li, Guilhem Dellinger, Sébastien Erpicum, Lihua Chen, Shuyue Yu, Léo Guiot, Pierre Archambeau, Michel Pirotton, Benjamin Dewals   +8 more
wiley   +1 more source