Supercritical flow
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Modern Compressible Flow: With Historical Perspective Open
1 Compressible Flow - Some History and Introductory Thoughts 2 Integral Forms of the Conservation Equations for Inviscid Flows 3 One-Dimensional Flow 4 Oblique Shock and Expansion Waves 5 Quasi-One-Dimensional Flow 6 Differential Conservat…
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Large-scale sediment waves and scours on the modern seafloor and their implications for the prevalence of supercritical flows Open
Large-scale (20 m to 7 km wavelength) bedforms are common on the seafloor, yet there is a lack of consensus on how they form and thus what to call them. We conducted statistical analysis on a dataset of 82 seafloor bedforms that span a ran…
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How to recognize crescentic bedforms formed by supercritical turbidity currents in the geologic record: Insights from active submarine channels Open
Submarine channels have been important throughout geologic time for feeding globally significant volumes of sediment from land to the deep sea. Modern observations show that submarine channels can be sculpted by supercritical turbidity cur…
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Energy Dissipation and Hydraulics of Flow over Trapezoidal–Triangular Labyrinth Weirs Open
In this work experimental and numerical investigations were carried out to study the influence of the geometric parameters of trapezoidal–triangular labyrinth weirs (TTLW) on the discharge coefficient, energy dissipation, and downstream fl…
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Self‐adjustment of stream bed roughness and flow velocity in a steep mountain channel Open
Understanding how channel bed morphology affects flow conditions (and vice versa) is important for a wide range of fluvial processes and practical applications. We investigated interactions between bed roughness and flow velocity in a stee…
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Bedforms and sedimentary structures related to supercritical flows in glacigenic settings Open
Upper‐flow‐regime bedforms, including upper‐stage‐plane beds, antidunes, chutes‐and‐pools and cyclic steps, are ubiquitous in glacigenic depositional environments characterized by abundant meltwater discharge and sediment supply. In this s…
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Hydraulic and sediment transport properties of autogenic avulsion cycles on submarine fans with supercritical distributaries Open
Submarine fans, like other distributive systems, are built by repeated avulsion cycles. However, relative to deltas and alluvial fans, much less is known about avulsions in subaqueous settings. In this study, we ran a set of subaqueous fan…
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Tidal Conversion and Mixing Poleward of the Critical Latitude (an Arctic Case Study) Open
The tides are a major source of the kinetic energy supporting turbulent mixing in the global oceans. The prime mechanism for the transfer of tidal energy to turbulent mixing results from the interaction between topography and stratified ti…
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Morphodynamics and depositional signature of low‐aggradation cyclic steps: New insights from a depth‐resolved numerical model Open
Bedforms related to Froude‐supercritical flow, such as cyclic steps, are increasingly frequently observed in contemporary fluvial and marine sedimentary systems. However, the number of observations of sedimentary structures formed by super…
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The influence of a vegetated bar on channel-bend flow dynamics Open
Point bars influence hydraulics, morphodynamics, and channel geometry in alluvial rivers. Woody riparian vegetation often establishes on point bars and may cause changes in channel-bend hydraulics as a function of vegetation density, morph…
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Morphodynamics of Supercritical Turbidity Currents in the Channel-Lobe Transition Zone Open
This study aims to resolve process-facies links at both bed and environmental scales for the channel lobe transition zone (CLTZ). Data comes from existing experimental and modern CLTZ studies and from new outcrop studies. The experiments s…
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Froude supercritical flow processes and sedimentary structures: New insights from experiments with a wide range of grain sizes Open
Recognition of Froude supercritical flow deposits in environments that range from rivers to the ocean floor has triggered a surge of interest in their flow processes, bedforms and sedimentary structures. Interpreting these supercritical fl…
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Reconstruction of bedform dynamics controlled by supercritical flow in the channel–lobe transition zone of a deep‐water delta (Sant Llorenç del Munt, north‐east Spain, Eocene) Open
Stable supercritical‐flow bedform phases under two‐dimensional steady flow are geometrically simple and include long‐wavelength cyclic steps at high Froude numbers and antidunes characterized by in‐phase flow that is near critical. Less we…
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Hydraulic Jump and Energy Dissipation with Sluice Gate Open
Movable weirs have been developed to address the weaknesses of conventional fixed weirs. However, the structures for riverbed protection downstream of movable weirs are designed using the criteria of fixed weirs in most cases, and these ap…
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Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD Open
Side weirs are utilized to regulate water surface and to control discharge and water elevation in rivers and channels. Here, the discharge coefficient for trapezoidal sharp-crested side weirs (TSCSW) and their affecting parameters are nume…
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Computing flooding of crossroads with obstacles using a 2D numerical model Open
[Departement_IRSTEA]Eaux [TR1_IRSTEA]ARCEAU
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Laboratory Study on 3D Flow Structures Induced by Zero-Height Side Weir and Implications for 1D Modeling Open
Side weir flows induce complex three-dimensional (3D) structures on the flow field in the main channel. Extensive experiments at
\nthe laboratory scale were conducted in order to investigate the flow field for the particular case of a side…
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The imprint of the analogue Hawking effect in subcritical flows Open
We study the propagation of low-frequency shallow water waves on a one-dimensional flow of varying depth. When taking into account dispersive effects, the linear propagation of long-wavelength modes on uneven bottoms excites new solutions …
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SPH Modelling of Hydraulic Jump Oscillations at an Abrupt Drop Open
This paper shows the results of the numerical modelling of the transition from supercritical to subcritical flow at an abrupt drop, which can be characterised by the occurrence of oscillatory flow conditions between two different jump type…
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What controls channel form in steep mountain streams? Open
Steep mountain streams have channel morphologies that transition from alternate bar to step‐pool to cascade with increasing bed slope, which affect stream habitat, flow resistance, and sediment transport. Experimental and theoretical studi…
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Experimental study on the hydraulic capacity of grate inlets with supercritical surface flow conditions Open
Due to an increasing number of heavy rainfall events, the managing of urban flooding requires new design approaches in urban drainage engineering. With bidirectional coupled numerical models the surface runoff, the underground sewer flow a…
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Numerical Simulations of the Flow Field of a Submerged Hydraulic Jump over Triangular Macroroughnesses Open
The submerged hydraulic jump is a sudden change from the supercritical to subcritical flow, specified by strong turbulence, air entrainment and energy loss. Despite recent studies, hydraulic jump characteristics in smooth and rough beds, t…
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Discharge coefficients for specific grated inlets. Influence of the Froude number Open
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Urban Water Journal on 2020, available online at: http://www.tandfonline.com/10.1080/1573062X.2020.1811881
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The Impact of Nonequilibrium Flow on the Structure of Turbulence Over River Dunes Open
Most past experimental investigations of flow over river dunes have focused on conditions that match semiempirical flow‐depth scaling laws, yet such equilibrium conditions are of limited value because they rarely occur in natural channels.…
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Experimental studies on scour of supercritical flow jets in upstream of screens and modelling scouring dimensions using artificial intelligence to combine multiple models (AIMM) Open
Performances of screens in watercourses are investigated for dissipating energy of supercritical flows, capable of inducing scour or stabilising hydraulic jumps. Subsequent scouring pits are characterised by pit depth and pit length. Inher…
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A Froude‐scaled model of a bedrock‐alluvial channel reach: 1. Hydraulics Open
The controls on hydraulics in bedrock‐alluvial rivers are relatively poorly understood, despite the importance of the flow in determining rates and patterns of sediment transport and consequent erosion. To measure hydraulics within a bedro…
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Flow Transients in Supercritical CO2 Natural Circulation Loop Open
A one-dimensional transient code is developed for studying the flow transient in the supercritical CO2 natural circulation loop. The transient code is validated with the experimental result. Various flow transients such as flow initiation,…
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Three-dimensional dynamics of vortex-induced vibration of a pipe with internal flow in the subcritical and supercritical regimes Open
The Three-dimensional (3-D) dynamical behaviors of a fluid-conveying pipe subjected to vortex-induced vibration are investigated with different internal flow velocity v. The values of the internal flow velocity are considered in both subcr…
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Multiple Inflow Branches at Supercritical-Type Vortex Drop Shaft Open
Vortex drop shafts serve to overcome important elevation differences in drainage systems. If well designed, they are performant in terms of energy dissipation and safety. However, the standard design requires well-defined approach flow con…
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Submarine Channel Mouth Settings: Processes, Geomorphology, and Deposits Open
Observations from the modern seafloor that suggest turbidity currents tend to erode as they lose channel-levee confinement, rather than decelerating and depositing their sediment load, has driven investigations into sediment gravity flow b…