Resistance in steep open channels due to randomly distributed macroroughness elements at large froude numbers
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In this article, energy loss in a steep open channel due to randomly spaced spherically shaped macroroughness elements such as boulders was investigated using a three-dimensional fluid dynamics solver.Abstract:
Energy loss in a steep open channel due to randomly spaced spherically shaped macroroughness elements such as boulders was investigated using a three-dimensional fluid dynamics solver. Firs...read more
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Energy Loss in Steep Open Channels with Step-Pools
TL;DR: In this paper, three-dimensional numerical simulations were performed for different flow rates and various geometrical parameters of step-pools in steep open channels to gain insight into the occurrence of energy loss and its dependence on the flow structure.
Journal ArticleDOI
A Computational Fluid Dynamics Investigation of using Large-Scale Geometric Roughness Elements in Open Channels
TL;DR: In this paper, a series of tests of T-shape roughness elements, fixed height, arranged in three different configurations, differ in the number of lines of roughness element.
Hybrid modeling on 3D hydraulic features of a step-pool unit
TL;DR: In this paper , a hybrid model based on Structure from Motion (SfM) and computational fluid dynamics (CFD) was proposed for step-pool morphology analysis in mountain streams.
Journal ArticleDOI
Experimental Study on Head Loss Due to Cluster of Randomly Distributed Non-Uniform Roughness Elements in Supercritical Flow
TL;DR: In this paper , the effects of the spatial distribution of roughness elements on water surface levels and head loss were analyzed in a 15 m long, 0.9 m wide flume with a slope of 5% under large Froude numbers.
Journal ArticleDOI
A combined approach of experimental and numerical modeling for 3D hydraulic features of a step-pool unit
TL;DR: In this article , a combined approach based on the technologies of Structure from Motion (SfM) and computational fluid dynamics (CFD) is proposed to visualize the 3D flow structures for the step-pool unit.
References
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Design of emergent and submerged rock-ramp fish passes
Ludovic Cassan,Pascale Laurens +1 more
TL;DR: An analytical model is developed to calculate the stage-discharge relationship for emergent and submerged rock-ramp fish passes and a turbulent length scale is proposed to close the turbulence model.
Journal ArticleDOI
Drag coefficients of boulders on a block ramp due to interaction processes
TL;DR: In this article, a physical model was used to describe the effect of boulder interaction processes with respect to forces and drag coefficients on a single boulder on a ramp, and the variable drag coefficients received a special focus because these influence the determination of mean water levels, mean velocities and forces on a one boulder.
Journal ArticleDOI
Mountain streams: Modeling hydraulics and substance transport
W. K. Meier,Peter Reichert +1 more
TL;DR: In this paper, the authors applied a friction estimator developed for river sections without pools and were then able to identify the dead zone volume and exchange parameters, which indicated that the evaluation of a tracer test for one single flow condition significantly decreases prediction uncertainty of substance transport for a specific stream reach.
Journal ArticleDOI
Flow resistance equations for mountain rivers
TL;DR: Three models of flow resistance (a Keulegan-type logarithmic law and two models developed for large-scale roughness conditions) were calibrated, validated and compared using an extensive database, representative of a wide hydraulic and geomorphologic range in the field of gravel-bed and mountain channels.
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