Journal of Hydraulic Engineering: Recent submissions
Now showing items 161-180 of 6800
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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 ... -
Functional Relationships between Critical Erosion Thresholds of Fine Reservoir Sediments and Their Sedimentological Characteristics
(ASCE, 2022/10/01)This study investigated multivariate relationships between critical erosion thresholds of reservoir sediments and their physicochemical and biological characteristics to unravel the effect of sedimentological parameters ... -
Performance of Intrusive Phase-Detection Probe with Large Sensor Size in Air-Water Flow Measurement and Application to Prototype Hydraulic Jump Study
(ASCE, 2022/11/01)A major challenge of prototype air-water flow measurement is the limited endurance of fragile phase-detection needle sensors in a high-momentum flow with risks of debris damage and particulate erosion. In the present study, ... -
Critical Submergence for Horizontal Dual Water Intakes under Perpendicular Uniform Approach Flow
(ASCE, 2022/10/01)The present paper discusses an experimental study on the critical submergence for lateral dual horizontal intakes that are placed in a row and perpendicular to a uniform approach flow. The effect of clear spacing between ... -
Stepped Spillway Prototype Operation and Air Entrainment: Toward a Better Understanding of the Mechanisms Leading to Air Entrainment in Skimming Flows
(ASCE, 2022/11/01)A spillway is a conveyance structure designed to pass flood waters. The construction of steps down the steep chute may contribute to some energy dissipation, in turn reducing the size of the downstream energy dissipator. ...