Results 21 to 30 of about 22,970 (166)

Effect of the Artificial Bed Roughness’s Shape on Hydraulic Jump’s Characteristics [PDF]

علوم و مهندسی آبیاری, 2018
Hydraulic jumps are the most important type of rapidly variable flow that occur in from the supercritical state to the subcritical state with the sudden increase of the water free surface in a relatively short path, and usually has a high kinetic energy ...
Saeid Salamiasl, Ahmad Fathi, Mehdi Ghomeshi   +2 more
doaj   +1 more source

Bed-Load Effects on Hydrodynamics of Rough-Bed Open-Channel Flows [PDF]

Journal of Hydraulic Engineering, 2005
The extent to which turbulent structure is affected by bed-load transport is investigated experimentally using a nonporous fixed planar bed comprising mixed-sized granular sediment with a d50 of 1.95 mm. Three different sizes of sediment ~d50= 0.77, 1.99, and 3.96 mm!
CAMPBELL L. J, MCEWAN I. K, NIKORA V. I, POKRAJAC D, GALLAGHER M, MANES, COSTANTINO   +5 more
openaire   +3 more sources

Prediction of the hydraulic jump length on sloping rough beds using meta- heuristic neuro-fuzzy model and differential evolution algorithm [PDF]

Journal of Applied Research in Water and Wastewater, 2019
Generally, Hydraulic jumps usually happen at the downstream of hydraulic structures like ogee spillways. In addition, one of the parameters affecting the proper design of stilling basin is calculation of the hydraulic jump length. In this study, a hybrid
Rahim Gerami Moghadam, Behrouz Yaghoubi, Mohammad Ali Izadbakhsh, Saeid Shabanlou   +3 more
doaj   +1 more source

Experimental Study of Effect of Rough Bed on Sequent Depth Ratio of Hydraulic Jump on Adverse Slope [PDF]

علوم و مهندسی آبیاری, 2012
Hydraulic jump is one of the important phenomena in rapidly varied flow. Due to this phenomenon the energy loss, the upstream flow velocity significantly decreases.
Parastoo Parsamehr, Ali Hosseinzadehdalir   +1 more
doaj  

Influence of bed roughness on near-bed turbulent flow characteristics

International Journal of Water Resources and Environmental Engineering, 2020
Influence of bed roughness on near-bed flow characteristics is of considerable importance, especially in turbulent flows over rough beds. This experimental study is devoted to insight various turbulent flow characteristics such as velocity distributions, Reynolds shear stresses (RSS) and velocity power spectra at the groove, lee and crest level of ...
Das Ratul, Nizar Sinan
openaire   +1 more source

Classification of Hydraulic Jump in Rough Beds [PDF]

Water, 2020
This paper presents a classification using a decision tree algorithm of hydraulic jump over rough beds based on the approach Froude number, Fr1. Specifically, 581 datasets, from literature, were analyzed. Of these, 280 datasets were for natural rough beds and 301 were for artificial rough beds.
Ghorban Mahtabi, Barkha Chaplot, Hazi Mohammad Azamathulla, Mahesh Pal   +3 more
openaire   +1 more source

Alluvial cover on bedrock channels: applicability of existing models [PDF]

Earth Surface Dynamics, 2020
Several studies have demonstrated the importance of alluvial cover; furthermore, several mathematical models have also been introduced to predict the alluvial cover on bedrock channels.
J. Mishra, T. Inoue
doaj   +1 more source

Effect of Roughness to Hydraulic Projection in an U-Shaped Channel, with Rough Bed

Journal of Fundamental and Applied Sciences, 2015
No Abstract.
A. Ghomri, M. Debabeche, F. Riguet
openaire   +4 more sources

Laboratory investigation of the effect of hysteresis phenomenon of supercritical flow on the rough bed on the relative residual energy parameter [PDF]

Journal of Hydraulic Structures
In the present study, the hysteretic behavior of supercritical flow that can occur in a channel near additional structures, such as changes in the bed of the channel, has been investigated experimentally and analytically.
Ehsan Aminvash, Rasoul Daneshfaraz, Sina Sadeghfam, Seyed Bahman Mousavi   +3 more
doaj   +1 more source

Quantifying Bed Surface Roughness in Bedrock and Boulder‐Bed Rivers

Journal of Geophysical Research: Earth Surface
AbstractThe surface roughness of river beds affects flow resistance and sediment transport. In rough‐bed rivers (RBRs), where flow is shallow relative to roughness height, the surface roughness is difficult to define due to complex multi‐scale roughness elements (bedrock, boulders, and sediment patches).
Houseago, R. C., Hodge, R. A., Asher, B., Ferguson, R. I., Hackney, C. R., Hardy, R. J., Hoey, T. B., Johnson, J. P. L., Rice, S. P., Yager, E. M., Yamasaki, T.   +10 more
openaire   +3 more sources