Journal of Hydraulic Engineering: Recent submissions
Now showing items 641-660 of 6886
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(American Society of Civil Engineers, 2018)This paper presents a methodology for estimating the bias limit of moving-boat acoustic Doppler current profiler (ADCP) streamflow measurements based on the classical error analysis techniques. The standard deviation ... -
Finite Crest Length Weir Nappe Oscillation
(American Society of Civil Engineers, 2018)Low-head discharge over weirs and crest gates can produce a nappe instability in curvilinear weir nappe flow, referred to as nappe oscillation or vibration, that is characterized by horizontal waves (sinusoidal wave pattern ... -
Simulations of Suspended Sediment Transport Using Low-Reynolds-Number Turbulence Models with a Unified Mesh
(American Society of Civil Engineers, 2018)This paper presents the application of a computationally convenient and physically consistent numerical approach to specify boundary conditions for suspended sediment (SS) with low-Reynolds-number (LRN) turbulence models. ... -
Improved Light Attenuation Method for 2D Data Acquisition of Sediment Depths
(American Society of Civil Engineers, 2018)An improved light attenuation method [light attenuation method for two-dimensional data acquisition (LAM2D)] to quantify two-dimensional (2D) sediment depths with higher accuracy is developed in the present study. The ... -
Clear-Water Local Scour at Skewed Complex Bridge Piers
(American Society of Civil Engineers, 2018)An experimental study on flow-induced clear-water local scour at complex bridge piers was conducted using two typical pier models, nine pile-cap elevations, and seven pier skew angles from ° to 9° with a 15° interval. ... -
Self-Similarity in Turbulent Wall-Wake Flow Downstream of a Wall-Mounted Vertical Cylinder
(American Society of Civil Engineers, 2018)The time-averaged turbulent flow characteristics in a wall-wake flow downstream of a wall-mounted vertical cylinder (free-surface piercing) are analyzed from the viewpoint of self-similarity in their vertical profiles. In ... -
Analytical Study of Dam-Break Wave Tip Region
(American Society of Civil Engineers, 2018)A new method is proposed to solve the two-dimensional shallow-water equations and derive the hydraulic properties in the wave tip region of the dam-break flow on a dry frictional horizontal channel of a rectangular cross ... -
Relative and Interactive Effects of Fluid’s Physicochemical Characteristics on the Incipient Motion of a Granular Particle under Laminar Flow Condition
(American Society of Civil Engineers, 2018)This paper presents an experimental research for studying the relative and interactive effects of three physicochemical fluid characteristics (viscosity, pH, and ionic strength) on the incipient motion of a granular particle ... -
Flow Structures in Evolving Scour Holes Caused by a Plunging Jet Downstream of a Weir
(American Society of Civil Engineers, 2018)Particle image velocimetry was used to measure the flow structures in evolving scour holes caused by a plunging jet downstream of a weir. The results clearly depict that four different types of roller were involved in scour ... -
Effect of Density Differences on the Forces Acting on a Moored Vessel While Operating Navigation Locks
(American Society of Civil Engineers, 2018)This paper investigates the effect of density differences on the forces acting on a moored vessel during lock operations, focusing on the effect of the position of the moored vessel in the lock chamber in the presence of ... -
Experimental and Numerical Investigation of Flow in a Newly Developed Vortex Drop Shaft Spillway
(American Society of Civil Engineers, 2018)A new shaft spillway composed of an inlet structure that includes inlet swirling-flow-generating piers, an annular weir, a vertical shaft, and an outlet structure is presented. Major factors influencing the inlet’s discharge ... -
Experimental Generation of Focusing Wave Groups on Following and Adverse-Sheared Currents in a Wave-Current Flume
(American Society of Civil Engineers, 2018)Focused waves are often used in physical and numerical studies as a representative condition for extreme waves or as a means to generate very steep and breaking waves at a prescribed location in space and time. They have ... -
Establishing a Relationship between Hydraulic Efficiency and Temperature Rise in Centrifugal Pumps: Experimental Study
(American Society of Civil Engineers, 2018)Hydraulic losses of a low specific speed centrifugal pump originate in the friction and turbulent dissipations in all components between the suction and discharge nozzles as well as fluid recirculation mainly caused by ... -
Effects of Intake Geometry on the Occurrence of a Free-Surface Vortex
(American Society of Civil Engineers, 2018)Both the profile and orientation of an intake entrance basically determine the characteristics of the flow (especially the velocity distribution and therefore the hydraulically developed subsurface depressions) toward the ... -
Faster Inverse Transient Analysis with a Head-Based Method of Characteristics and a Flexible Computational Grid for Pipeline Condition Assessment
(American Society of Civil Engineers, 2018)Targeted and proactive pipeline condition assessment is critical for cost-effective maintenance of aging water transmission and distribution systems. The current research proposes a fast inverse transient analysis (ITA) ... -
Combining Predictions and Assessing Uncertainty from Sediment Transport Equations Using Multivariate Bayesian Model Averaging
(American Society of Civil Engineers, 2018)A key assumption in the use of numerical sediment transport models is the selection and application of an equation to describe sediment transport capacity. This assumption introduces uncertainty in the model predictions ... -
Modeling Transitions between Free Surface and Pressurized Flow with Smoothed Particle Hydrodynamics
(American Society of Civil Engineers, 2018)In several engineering applications, it is important to model flows that might transition between free surface and pressurized conditions. An explicit smoothed particle hydrodynamics (SPH) model for incompressible fluid ... -
Meeting Computational Challenges Presented by Transitioning Flow Patterns at Pipe Junctions
(American Society of Civil Engineers, 2018)This article addresses the issues, related to transitioning junction flow patterns, that afflict the hydraulic simulation of pipe network. At transition points, the values of head change caused by a junction are not unique, ... -
Ball Valve Behavior under Steady and Unsteady Conditions
(American Society of Civil Engineers, 2018)The aim of this paper is the experimental characterization of a ball valve under steady and unsteady conditions, based on experimental tests carried out in a pressurized pipe system assembled at Instituto Superior Técnico. ... -
Generalized Flexible Method for Simulating Transient Pipe Network Hydraulics
(American Society of Civil Engineers, 2018)Characteristic solution methods, namely the method of characteristics (MOC) and wave characteristics method (WCM), are widely used for simulating transient pipe network flows. Because the MOC computes solutions at interior ...