Journal of Hydraulic Engineering: Recent submissions
Now showing items 561-580 of 6886
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Investigation of Submerged Soil Excavation by High-Velocity Water Jet Using Two-Fluid Smoothed Particle Hydrodynamics Method
(American Society of Civil Engineers, 2019)In this paper, submerged soil excavation by high-velocity water jet was investigated by means of a two-fluid smoothed-particle hydrodynamics (SPH) method. A critical state theory was coupled to account for the dilatancy ... -
Characterization of the Overtopping Flow through the Downstream Shell of Rockfill Dams
(American Society of Civil Engineers, 2019)In 1997, Toledo developed a numerical model to characterize the flow through the downstream shell of a rockfill dam for the overtopping scenario. He performed a parametric study focused on nondeformable, completely saturated ... -
Evaluating Riparian Vegetation Roughness Computation Methods Integrated within HEC-RAS
(American Society of Civil Engineers, 2019)Determining the roughness of riparian vegetation is often a challenge in river hydraulic modeling. A large number of quantitative methods have been developed, but none of them have been integrated into any one-dimensional ... -
Movable-Bed Experiments Using Spur Dike to Concentrate Flow in One Channel of Multithreaded Channel Model
(American Society of Civil Engineers, 2019)This paper presents the results of an experimental study in which an acoustic Doppler velocimeter (ADV) was used to monitor the longitudinal velocity profiles and discharge proportions in a channel with a mobile bed and ... -
Interference of Dual Spillways Operations
(American Society of Civil Engineers, 2019)Dual spillway interference refers to the loss of hydraulic performance of spillways when they are placed close together. Spillway interference is examined using both physical experiments and numerical simulations. Stage ... -
Formula for Sediment Transport Subject to Vertical Flows
(American Society of Civil Engineers, 2019)Sediment transport is a geophysical phenomenon in which sediment particles are driven to move in streamwise and vertical directions by various forces. Almost all existing formulas of sediment transport were derived without ... -
Effect of Bridge Abutment Length on Turbulence Structure and Flow through the Opening
(American Society of Civil Engineers, 2019)The method of large eddy simulation (LES) was employed to investigate the flow and turbulence structure around bridge abutments of different lengths placed in a compound, asymmetric channel. The simulations were faithful ... -
Effects of Grain-Size Composition on Flow Resistance of Debris Flows: Behavior of Fine Sediment
(American Society of Civil Engineers, 2019)Investigations are presented on the effects of grain-size composition on the flow resistance of debris flows via laboratory experiments with bidisperse granular materials. Two models focusing on whether the smaller particles ... -
High Resolution Observations of an Outer-Bank Cell of Secondary Circulation in a Natural River Bend
(American Society of Civil Engineers, 2019)Secondary circulation is a mechanism that increases vertical exchange between the horizontal layers in open channels. Vertical shear in curved flows induces secondary circulation in the plane normal to the primary flow ... -
Nappe Oscillations on Free-Overfall Structures: Size Scale Effects
(American Society of Civil Engineers, 2019)Nappe oscillation and its potentially undesirable impact associated with significant noise production can be an issue for free-overfall hydraulic structures. Although nappe oscillation has been observed on various prototype ... -
Studying the Peak Discharge through a Planar Dam Breach
(American Society of Civil Engineers, 2019)Studying the flow through a dam breach is important because it is characterized by a great deal of uncertainty and can be associated with loss of lives and properties. In the present study, planar dam breach erosion due ... -
Impedance Method for Multiple Reservoir Pipeline Valve Systems
(American Society of Civil Engineers, 2019)The analysis of transients in a pipeline system has been primarily studied for a reservoir pipeline valve system with a single valve maneuver. This paper introduced a method to handle transients associated with multiple ... -
Moving-Window Detrending for Grain-Roughness Parameterization
(American Society of Civil Engineers, 2019)Detrending is required to enable robust parameterization of surface roughness by removing large topographic trends from fluvial data. A range of detrending methods exist in the literature; however, there is limited ... -
Theoretical Investigation of Leak’s Impact on Normal Modes of a Water–Filled Pipe: Small to Large Leak Impedance
(American Society of Civil Engineers, 2019)Recent research shows the potential of resonant frequency-based leakage detection methods. However, there is a disagreement in whether a leak shifts the normal modes (often called natural or resonant modes) and whether a ... -
Prediction of Overtopping Dike Failure: Sediment Transport and Dynamic Granular Bed Deformation Model
(American Society of Civil Engineers, 2019)Earth dike failure due to overtopping flow produces a significant displacement of bed-sediment mass. While sediment dynamics typically prevails as a nonequilibrium condition, the bed deformation is resulted from the ... -
Scour around an Erodible Abutment with Riprap Apron over Time
(American Society of Civil Engineers, 2019)Acknowledged as a significant cause of bridge failure is abutment scour around bridge foundations. Because of the complexity of flow structures and scour mechanisms around an abutment, abutment scour remains the focus of ... -
Cramer-Rao Lower Bound for Performance Analysis of Leak Detection
(American Society of Civil Engineers, 2019)Due to random noise in real measurements, leak detection (estimation of leak size and location) is subject to a degree of uncertainty. This paper provides a framework to investigate the lower bound of the variance of a ... -
Velocity Correction Coefficients in Pressure Correction–Type Model
(American Society of Civil Engineers, 2019)Velocity correction methods are often used in numerical models simulating fluid flows. This paper presents a new method to evaluate the velocity correction coefficient: an equation constructed from the coefficient matrix ... -
Investigation of Submerged Soil Excavation by High-Velocity Water Jet Using Two-Fluid Smoothed Particle Hydrodynamics Method
(American Society of Civil Engineers, 2019)In this paper, submerged soil excavation by high-velocity water jet was investigated by means of a two-fluid smoothed-particle hydrodynamics (SPH) method. A critical state theory was coupled to account for the dilatancy ... -
Live-Bed Scour at Wide and Long-Skewed Bridge Piers in Comparatively Shallow Water
(American Society of Civil Engineers, 2019)An investigation of the characteristics of live-bed scour at circular and skewed rectangular (slab) piers in comparatively shallow flows is presented. The 110 experiments were undertaken in a 2.4-m flume using two circular ...