Results 11 to 20 of about 2,559 (287)
Prediction of the transition nappe/skimming flow on a stepped channel [PDF]
Journal of Hydraulic Research, 1996 On a stepped channel, two distinct flow regimes may occur : nappe flow for low discharges and flat slopes, and skimming flow for larger flow rates. A simple analytical method to predict the onset of skimming flow is presented. The method is based upon the change of momentum direction at the impact of the jet on the downstream step.
Chanson, Hubert, H. Chanson
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Flow resistance in skimming flows in stepped spillways and its modelling [PDF]
Canadian Journal of Civil Engineering, 2002 Dams and weirs must be equipped with adequate flood-release facilities for a safe dissipation of the kinetic energy of the flow. With stepped spillway design, it is essential to accurately predict the flow-resistance contribution of the steps. The authors investigate the flow resistance of skimming flows and associated form losses.
H Chanson, Youichi Yasuda, Iwao Ohtsu
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Turbulence characteristics in skimming flows on stepped spillways [PDF]
Canadian Journal of Civil Engineering, 2008 The stepped spillway design is characterized by an increase in the rate of energy dissipation on the chute associated with a reduction of the size of the downstream energy dissipation system. This study presents a thorough investigation of the air–water flow properties in skimming flows with a focus on the turbulent characteristics.
Carosi, Giovanna, Chanson, Hubert
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ANALYSIS OF NON-UNIFORM-AEREATED SKIMMING FLOWS IN STEPPED CHANNELS [PDF]
Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 2013 For the hydraulic design of steep stepped channels, it is important to elucidate the aerated flow characteristics of skimming flows both in nonuniform and quasi-uniform flows. For the nonuniform aerated flow region, an analytical equation for calculation of the aerated flow depth is developed, and the surface profile and specific energy are calculated ...
Takahashi, M., Ohtsu, I.
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Hydraulics of skimming flows over stepped channels and spillways [PDF]
Journal of Hydraulic Research, 1994 Stepped channel applications include a broad range of domains. A detailed review (past and present) was published by the author (Chanson 1995). To date most studies on gepped chutes applies to gradually variedflows in rectangular prismatic channels with horizontal. The three-dimensional features of stepped chute flows are not accounted.
Chanson, Hubert
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Numerical investigation of air-entrainment in skimming flow over stepped spillways
Theoretical and Applied Mechanics Letters, 2016 As a widely used flood energy dissipator, the stepped spillway can significantly dissipate the kinetic or hydraulic energy due to the air-entrainment in skimming flow over the steps.
Jiemin Zhan, Jianbo Zhang, Yejun Gong
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Dynamics of skimming flow in the wake of a vegetation patch
Aeolian Research, 2016 AbstractDryland vegetation is often spatially patchy, and so affects wind flow in complex ways. Theoretical models and wind tunnel testing have shown that skimming flow develops above vegetation patches at high plant densities, resulting in little or no wind erosion in these zones.
Mayaud, J, Wiggs, G, Bailey, R
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Study of skimming flow in flat slope stepped channels [PDF]
, 2017 In this thesis, the results of a numerical modeling study that addresses the skimming flow properties in flat slope stepped channels, are presented and analyzed. Experimental data of mean flow velocity profiles from Hunt and Kadavy's physical model was used for the calibration of the results obtained with a numerical model performed with the commercial
López de Mesa Aguilar, Daniel
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Aerodynamic Roughness Height of Gravel-covered Plains in the Puna of Argentina
The Planetary Science Journal, 2023 Plains covered by gravel-dominated desert pavement in the Puna of Argentina have an aerodynamic roughness height (or length) z _0 of ∼1 cm, likely representing a skimming flow regime above the closely spaced gravel particles. Aerodynamic roughness height
James R. Zimbelman +2 more
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Location of inception point of alternating steps stepped spillways
Sulaimani Journal for Engineering Sciences, 2023 This study explored the effects of flat-stepped spillways having alternating steps on the inception point location. Two wooden stepped spillways with a longitudinal slope of 26.6° were constructed in a rectangular flume and tested at various discharges ...
Burhan S. Muhammed1 +1 more
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