Journal of Hydraulic Engineering: Recent submissions
Now showing items 241-260 of 6886
-
Reconstructing Extended Irregular Anomalies in Pipelines Using Layer-Peeling with Optimization
(American Society of Civil Engineers, 2023/01/01)Pipe wall condition assessment is critical for targeted maintenance and failure prevention in water distribution systems. This paper proposes a spatially distributed pipeline condition assessment technique using persistent ... -
Uncertainties in Models Predicting Critical Bed Shear Stress of Cohesionless Particles
(American Society of Civil Engineers, 2023/04/01)Our data show large scatter in the critical Shields stress values for initial sediment motion. The main sources of dispersion are related to the methodological procedures defining the inception of movement (i.e., visual ... -
Dynamics of Underwater Gas Blowout in Sonic Regime: Laboratory-Scale Study
(American Society of Civil Engineers, 2023/01/01)To understand the dynamics of vigorous gas jets in underwater gas blowouts, we present a laboratory experiment and data analysis to quantify key physical properties of gas jets horizontally discharged through a single ... -
Small-Scale Modeling of Flexible Barriers. II: Interactions with Large Wood
(American Society of Civil Engineers, 2023/03/01)During strong floods, rivers often carry significant amounts of sediment and pieces of large wood (LW). When bridges and hydraulic structures are unable to allow LW to pass through, it becomes necessary to trap LW through ... -
Small-Scale Modeling of Flexible Barriers. I: Mechanical Similitude of the Structure
(American Society of Civil Engineers, 2023/03/01)Flexible barriers can be used to trap woody debris or debris flows. However, their small scale modelling is challenging because of their possible deformation. This article addresses how to meet the partial mechanical ... -
Bed Shear Stress in Experimental Flash Flood Bores over Dry Beds and over Flowing Water: A Comparison of Methods
(American Society of Civil Engineers, 2023/04/01)Hydraulic parameters, including bed shear stress, are challenging to calculate for flash floods. Applying theoretical equations to strongly unsteady flows requires comprehensive and accurate flow data that are difficult ... -
Numerical Modeling of Self-Aeration in High-Speed Flows over Smooth Chute Spillways
(American Society of Civil Engineers, 2023/03/01)In chute spillways, self-aeration occurs downstream of the inception point, where the turbulent boundary layer edge approaches the free surface, if they are long enough. Downstream of the inception point, a layer containing ... -
A Reassessment of Contraction Scour at Bridge Waterways
(ASCE, 2022/12/01)This technical note reassesses the prevailing understanding of lateral-contraction scour at bridge waterways. Herein, lateral contraction (or simply contraction) implies a reduction of flow width. Nonuniform flow to and ... -
Elastic Water Column Model for Hydraulic Transient Analysis of Pipe Networks
(ASCE, 2022/12/01)The transient behavior of pipe systems is typically simulated using water hammer models [such as the method of characteristics (MOC)], or rigid water column (RWC) models depending on whether the hydraulic transition is ... -
Jet Impinging in Plunging Dropshafts of Medium Height
(ASCE, 2022/12/01)A physical model study was conducted on jet impingement in a plunging dropshaft with different drop heights of 3.38 and 1.88 m. Experimental observations show that an upward splash, annular flow, and downward bounced ... -
X-Ray Computed Tomography to Measure Bed Density in Sand Transport
(ASCE, 2022/12/01)This paper reports a new experimental method applying medical X-ray computed tomography (CT) to estimate the bed load in sand transport. A set of current-generated sand ripple experiments were conducted in a small hydraulic ... -
Experimental Comparison of Inclined Flows with and without Intense Sediment Transport: Flow Resistance and Surface Elevation
(ASCE, 2022/12/01)The effect of the intense transport of lightweight sediment without turbulent suspension (Shields numbers of mixture flow from 0.34 to 1.80) on resistance and surface elevation of water flow in an open channel is experimentally ... -
Numerical Investigation of Inclined Dense Jet Behavior in Shallow Waters: Effect of Depth Variation and Free Surface Displacement
(ASCE, 2022/12/01)The effects of the free surface on the behavior of inclined dense jets in shallow ambient were investigated in detail. The hybrid turbulence model scale-adaptive simulation (SAS), coupled with the volume of fluid (VOF) ... -
Generation of Supersaturated Total Dissolved Gases from Low-Level Outlets at Hydropower Facilities
(ASCE, 2022/12/01)Supersaturated total dissolved gases (TDGs) generated by dams can cause gas bubble trauma and mortality in fish in downstream waters. In this study, we evaluated air entrainment and generation of supersaturated TDG at two ... -
Contaminant Dispersion and Breakthrough in Groundwater Flow: Case Study in Maui, Hawaii
(ASCE, 2022/12/01)Previously published field data, from groundwater tracer studies in Hawaii, are used to develop a theory for dispersion based on the probability density function for tracer particle velocities in the aquifer. The density ... -
Large Eddy Simulation of Inclined Negatively Buoyant Jets with Sloped Beds
(ASCE, 2022/11/01)The effluents produced by reverse osmosis desalination plants are usually disposed under the surface of the sea as inclined negatively buoyant jets (INBJ), to achieve the highest mixing rate. Bed slope in the local environment ... -
Improved Modeling of Flows in Sewer Pipes with a Novel, Well-Balanced MUSCL Scheme
(ASCE, 2022/12/01)The numerical study in this paper aims at obtaining exact well-balance and improving the computational accuracy, efficiency, and the performance at wet–dry fronts, especially for the flows in ventilated sewer pipes. To ... -
On Sediment Mass Flux Directionality Induced by Yawed Permeable Vanes under Near-Critical Mobility Conditions
(ASCE, 2022/10/01)Experiments were conducted in open channel flows under near-critical mobility conditions to quantify local evolution of the sediment bed induced by emergent and submerged rectangular vertical porous walls in yawed conditions. ... -
Reaeration in Supercritical Open Channel Flows: An Experimental Study
(ASCE, 2022/10/01)Reaeration is a primary path of reoxygenation in streams, fundamental to environmental and ecological integrity. Previous laboratory studies of reaeration rates in subcritical flows showed large scatter in results, with ...