Results 91 to 100 of about 107,957 (205)

Numerical Simulation of the Influence of Spur Dikes Spacing on Local Scour and Flow

Applied Sciences, 2019
The spacing of spur dikes is an important consideration for the layout of spur dike channels. This study focuses on the local scour morphology and flow field characteristics of spur dikes with different spacings.
Jian Ning, Guodong Li, Shanshan Li
doaj   +1 more source

Uncertainty analysis for direct bed shear stress measurements using shear plates

Acta Geophysica
Abstract Accurate estimation of bed shear stress is crucial for understanding sediment transport and morphodynamic processes in fluvial and environmental flows. Shear plates offer a direct measurement approach that avoids the restrictive flow assumptions of many indirect methods.
José Aliaga-Villagrán, Giada Artini, Jesús Macías-Lezcano, Toni Llull, Francisco Núñez-González, Jochen Aberle   +5 more
openaire   +1 more source

Giant ripples on comet 67P/Churyumov-Gerasimenko sculpted by sunset thermal wind

, 2017
Explaining the unexpected presence of dune-like patterns at the surface of the comet 67P/Churyumov-Gerasimenko requires conceptual and quantitative advances in the understanding of surface and outgassing processes. We show here that vapor flow emitted by
Andreotti, B., Claudin, P., Jia, P.
core   +3 more sources

STUDY ON BED SHEAR STRESS AROUND CHANNEL CONSTRICTION

Doboku Gakkai Ronbunshu, 1985
The flow passing through constriction in an open channel is highly three-dimensional. The center flow close to the bed, however, can be analyzed by combining the two-dimensional potential flows and by using the boundary layer analysis already developed by the authors.
Susumu HASHIMOTO, Yoshitaka FUKUI, Hideo KIKKAWA   +2 more
openaire   +2 more sources

Investigation of Shear Stress Distribution in a 90 Degree Channel Bend

International Journal of Applied Mechanics and Engineering, 2019
Shear stress is a key parameter that plays an important role in sediment transport mechanisms; therefore, understanding shear stress distribution in rivers, and especially in river bends, is necessary to predict erosion, deposition mechanisms and lateral
Seung Kyu Lee, Truong An Dang, Van Tuan Le   +2 more
doaj   +1 more source

Selection of dune shapes and velocities. Part 1: Dynamics of sand, wind and barchans

, 2002
Almost fifty years of investigations of barchan dunes morphology and dynamics is reviewed, with emphasis on the physical understanding of these objects. The characteristics measured on the field (shape, size, velocity) and the physical problems they rise
Andreotti, Bruno, Claudin, Philippe, Douady, Stéphane   +2 more
core   +3 more sources

Evaluating the Effect of Morphologic Units on Fractional Sediment Mobility and Bedload Transport in a Small Pool‐Riffle Reach

Water Resources Research
This study examines the spatial pattern of fractional sediment mobility and assesses the influence of morphologic units on bedload transport in a small pool‐riffle reach with limited supply.
Nisreen G. Al‐Ghorani, Marwan A. Hassan, Conor McDowell   +2 more
doaj   +1 more source

Surf and swash zone hydrodynamics forced by oblique, monochromatic waves in a wave basin with a smooth, impermeable beach

Applied Ocean Research
Beaches are coastal features that offer economic benefits, ecosystem services, and natural barriers against flooding. Sustainable management of beaches requires a firm understanding of hydrodynamics and sediment transport processes.
Alexandra E. Schueller, Kelsey Fall, Hyungyu Sung, Ryan P. Mulligan, Jason Olsthoorn, Nimish Pujara, Patricia Chardón-Maldonado, Rafiu Oyelakin, Jack A. Puleo   +8 more
doaj   +1 more source

Physically Based New Formula for Cohesive Bed Erosion Rate [PDF]

علوم و مهندسی آبیاری, 2015
The currently most widely used erosion models are poorly based on physical principles and lack the ability to describe erosion of the consolidated sediment bed at increased shear stresses e.g. during a storm.
Hesam Fouladfar, Mahmood Shafaei Bajestan, Manoochehr Fathi Moghadam   +2 more
doaj  

Turbulent flow characteristics over rough permeable and impermeable gravel-bed stream- an experimental study

Journal of Hydrology and Hydromechanics
The study aims to presents flow heterogeneity over rough permeable and impermeable gravel-bed stream. The rough permeable stream is prepared by laying multiple layers of gravel, whereas its impermeable counterpart is presented by a resin-casted gravel ...
Das Ratul, Ghosh Mithun
doaj   +1 more source