Showing papers in "Journal of Hydraulic Research in 2021"
TL;DR: In this paper, the complexity of the load rejection process, the accompanied complex low frequency pressure fluctuations and their sources have not been determined. But the authors propose a load rejection transient p...
Abstract: Owing to the complexity of the load rejection process, the accompanied complex low frequency pressure fluctuations and their sources have not been determined. Herein, the load rejection transient p...
27 citations
TL;DR: Turbulence in open channel flows is ubiquitous to hydro-environmental applications and has recently increased in importance with the deployment of tidal stream turbines, as turbulence impacts both open and closed channel flows as mentioned in this paper.
Abstract: Turbulence in open channel flows is ubiquitous to hydro-environmental applications and has recently increased in importance with the deployment of tidal stream turbines, as turbulence impacts both ...
25 citations
TL;DR: Self-cleansing is a hydraulic design concept for drainage systems for mitigation of sediment deposition as mentioned in this paper, which has mostly been performed in circular channels and has been shown to work well in the case of self-cleaning.
Abstract: Self-cleansing is a hydraulic design concept for drainage systems for mitigation of sediment deposition. Experimental studies in the literature have mostly been performed in circular channels. In t...
17 citations
TL;DR: In this article, the free surface behavior of gravity-driven shallow turbulent flows has been studied and the free-surface behavior of shallow turbulent flow has been observed in the last two decades.
Abstract: Over the last two decades, interest in the free-surface behaviour of gravity-driven shallow turbulent flows has increased considerably. It is believed that observation of free-surface behaviour can...
17 citations
TL;DR: In this paper, the authors present an experimental analysis of hydraulic roughness variations due to changes in alluvial cover in a mixed bedrock-alluvial meandering channel with larger bedrock roughness than alluvia rou...
Abstract: We present an experimental analysis of hydraulic roughness variations due to changes in alluvial cover in a mixed bedrock-alluvial meandering channel with larger bedrock roughness than alluvial rou...
13 citations
TL;DR: In this article, the impact of run-off current approaches in hydraulic structure design has been investigated in the context of man-made waterworks interacting with the rainfall runoff to store and convey water.
Abstract: Hydraulic structures are man-made waterworks interacting with the rainfall run-off to store and convey water, or mitigate the impact of run-off Current approaches in hydraulic structure design ten
12 citations
TL;DR: Gravel-bed roughness structures for an unworked bed and a water-worked bed were analyzed at different topographic scales measuring the bed surfaces by a 3D terrestrial laser scanner in a laboratory as mentioned in this paper.
Abstract: Gravel-bed roughness structures for an unworked bed and a water-worked bed are analysed at different topographic scales measuring the bed surfaces by a 3D terrestrial laser scanner in a laboratory ...
11 citations
TL;DR: In this paper, the inflow conditions upstream of hydraulic jumps can affect flow aeration, bed pressures and turbulence, and the effects of inflow condition on hydraulic jumps are investigated.
Abstract: Previous research has shown that the inflow conditions upstream of hydraulic jumps can affect flow aeration, bed pressures and turbulence. However, studies of the effects of inflow conditions on fr...
10 citations
TL;DR: In this paper, the influences of different emergent and rigid vegetation distributions on hydrodynamic characteristics in a 180° curved open channel are experimentally investigated in order to investigate the influence of different vegetation distributions.
Abstract: The influences of different emergent and rigid vegetation distributions on hydrodynamic characteristics in a 180° curved open channel are experimentally investigated in this study. Experimental res...
10 citations
TL;DR: In this paper, the effects of the variation of the viscoelastic pipe material properties on the transient pressure wave propagation were investigated through laboratory and numerical tests, and the used experimental s...
Abstract: The effects of the variation of the viscoelastic pipe material properties on the transient pressure wave propagation are investigated through laboratory and numerical tests. The used experimental s...
10 citations
TL;DR: Flow overtopping can lead to the initiation of breaching and failure of fluvial dikes, causing severe inundations and damage in the protected areas as mentioned in this paper, which is a concern for flood risk management and prevention.
Abstract: Flow overtopping can lead to the initiation of breaching and failure of fluvial dikes, causing severe inundations and damage in the protected areas. For flood risk management and prevention, the ac...
TL;DR: In this article, the authors present an experimental study of natural hyperconcentrated flows of fine sediment from the Draix-Bleone observatory, showing that suspensions of volumic concentration ranging from 29 to 44% were tested in a rheo...
Abstract: We present an experimental study of natural hyperconcentrated flows of fine sediment from Draix-Bleone observatory. Suspensions of volumic concentration ranging from 29 to 44% were tested in a rheo...
TL;DR: In this article, the suitability of a low-cost sensor, the Intel Atom X2, for measuring flow depths in free-surface turbulent flows can be analyzed, and the Intel X2 is used to measure flow depths.
Abstract: Measuring flow depths in free-surface turbulent flows can be challenging due to their fast dynamics and the presence of aeration. This study analyses the suitability of a low-cost sensor, the Intel...
TL;DR: In this article, a mixture mode is proposed to tackle aerated flows for spillway design. But, these models are usually empirical and often lack thorough calibration, which is a limitation of numerical models.
Abstract: Numerical models are used increasingly to tackle aerated flows for example in spillway design. However, these models are usually empirical and often lack thorough calibration. Herein a mixture mode...
TL;DR: In this article, the apparent bedload velocity and backscattering strength measured by acoustic Doppler current profilers were used to assist bedload assessment in the field, and two ADCPs were tested to test this hypothesis.
Abstract: Both the apparent bedload velocity and the backscattering strength measured by acoustic Doppler current profilers could assist bedload assessment in the field. To test this hypothesis, two ADCPs wo...
TL;DR: In this article, various popular unsteady friction models are considered to simulate pressure attenuation in pipe-filling, and various pipe filling models are compared to simulate pipe filling.
Abstract: Existing pipe-filling models have primarily considered steady friction alone, tending to underestimate pressure attenuation. Various popular unsteady friction models are considered here to simulate...
TL;DR: In this article, the fluid viscosity of debris flow may change significantly along with the variety of sediment materials involved in the debris flow, and the number of entrainments.
Abstract: Debris flows are typical two-phase flows that commonly occur with entrainment. By involving sediment materials, the fluid viscosity of debris flow may change significantly along with the variety of...
TL;DR: In this paper, the authors present the results of the monitoring and analysis of the dynamic behaviour of the Gorino Ferrarese (Ferrara, Italy) water distribution system.
Abstract: This paper presents the results of the monitoring and analysis of the dynamic behaviour of the Gorino Ferrarese (Ferrara, Italy) water distribution system. The network is subjected to ordinary oper...
TL;DR: Solitary waves are often used to replicate tsunami waves and therefore, the study of their propagation and interactions with structures could help to understand the impacts of tsunami waves on infrastructures as discussed by the authors.
Abstract: Solitary waves are often used to replicate tsunami waves and, therefore, the study of their propagation and interactions with structures could help to understand the impacts of tsunami waves on inf...
TL;DR: In this article, the authors analyzed the effects of approach water velocity and area residual of tunnel cross-secti on air supply to free-surface water flows in tunnels, which is a key safety issue for high head dams.
Abstract: Air supply to free-surface water flows in tunnels is a key safety issue for high-head dams The present study analyses the effects of approach water velocity and area residual of tunnel cross-secti
TL;DR: In this paper, a multi-phase smoothed particle hydrodynamics (SPH) formulation in combination with a granular rheological model is applied to simulate the 2007 Chehalis Lake landslide and the subsequent tsunami.
Abstract: A multi-phase smoothed particle hydrodynamics (SPH) formulation in combination with a granular rheological model is applied to simulate the 2007 Chehalis Lake landslide and the subsequent tsunami. ...
TL;DR: In this article, the turbulent flow of Herschel-Bulkley slurries through circular horizontal pipes is described, in particular that of concentrated domestic slurry obtained upon separation of domestic was discussed.
Abstract: This article concerns the turbulent flow of Herschel–Bulkley slurries through circular horizontal pipes; in particular, that of concentrated domestic slurry obtained upon separation of domestic was...
TL;DR: In this article, a vegetated flow and sediment transport model for investigating flow-vegetation-sediment interactions is presented, where vegetation-induced turbulence is simulated by a k − e turbulence closure.
Abstract: This paper presents a vegetated flow and sediment transport model for investigating flow–vegetation–sediment interactions. Vegetation-induced turbulence is simulated by a k − e turbulence closure, ...
TL;DR: In this article, the formation of an air-entraining vortex in the vicinity of an intake structure is considered to be a major problem of the intake and these vortices are not acceptable as they decrease the efficiency of...
Abstract: Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be a major problem of the intake. These vortices are not acceptable as they decrease the efficiency of ...
TL;DR: In this article, the prediction of the pickup rate of non-cohesive sediments is studied and shown to be highly correlated with morphologic evolution, management of water quality and aquatic ecosystems.
Abstract: Erosion of sediments is of crucial significance to morphologic evolution, management of water quality and aquatic ecosystems. However, the prediction of the pickup rate of non-cohesive sediments is...
TL;DR: In this article, the entrainment events of a single sediment particle resting in a small pocket on a smooth bed in an open channel flow were investigated. The data were acquired with a...
Abstract: This study presents experimental investigations of entrainment events of a single sediment particle resting in a small pocket on a smooth bed in an open channel flow. The data were acquired with a ...
TL;DR: In this paper, the authors explain the effect of rock falls on the stability of hydropower tunnels and propose a method to simulate tunnel conditions, using high-level simulation techniques.
Abstract: Hydropower tunnels are generally subject to a degree of rock falls. Studies explaining this are scarce and the current industrial standards offer little insight. To simulate tunnel conditions, high...
TL;DR: In this article, flow patterns around three widely used instream rock structures in an open-channel flume were investigated using high-resolution large-eddy simulations, specifically, rock vanes at two different in...
Abstract: Flow patterns around three widely used instream rock structures in an open-channel flume were investigated using high-resolution large-eddy simulations. Specifically, rock vanes at two different in...
TL;DR: In this paper, a series of experiments were conducted beneath simulated partial ice covers to investigate the turbulent flow behavior using a particle image velocimetry system and the velocity data were used to ass...
Abstract: A series of experiments were conducted beneath simulated partial ice covers to investigate the turbulent flow behaviour using a particle image velocimetry system. The velocity data were used to ass...
TL;DR: A series of lock-release experiments are carried out to investigate the hydrodynamics of weakly and strongly stratified two-layer gravity currents on a flat bottom as discussed by the authors, where a particle image velocimetr
Abstract: A series of lock-release experiments are carried out to investigate the hydrodynamics of weakly and strongly stratified two-layer gravity currents (GC) on a flat bottom A particle image velocimetr