Journal of Hydraulic Engineering: Recent submissions
Now showing items 681-700 of 6886
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Role of Structure Submergence on Scour Evolution in Gravel Bed Rivers: Application to Slope-Crested Structures
(American Society of Civil Engineers, 2018)This paper, written to celebrate the 6th anniversary of the Journal of Hydraulic Engineering, examines scour evolution around sloped-crest structures, known as barbs. The results extend the literature database of hydraulic ... -
Rosette Diffusers for Dense Effluents in Flowing Currents
(American Society of Civil Engineers, 2018)Laboratory experiments on rosette diffusers for dense concentrate disposal from seawater desalination plants into flowing currents are reported. The dimensionless parameters for riser spacing and current speed were typical ... -
Calibration of a Marsh-Porosity Finite Element Model: Case Study from a Macrotidal Creek and Floodplain in Northern Australia
(American Society of Civil Engineers, 2018)This study reports on the key findings from the application of a marsh-porosity model to a complex floodplain environment in northern Australia. The paper addresses the fundamental challenges associated with leakage in the ... -
Mass Loss to the Trailing Stem of a Sediment Cloud
(American Society of Civil Engineers, 2018)Engineering activities, such as disposal of dredged materials or land reclamation, produce sediment clouds that can be characterized by a descending thermal and a trailing stem resulting from an instantaneous release. The ... -
Role of Ambient Turbulence in Dense Gas Dispersion from Confined Urban Regions
(American Society of Civil Engineers, 2018)Experimental results are presented for the rate of flushing of a dense fluid from an idealized two-dimensional square urban canyon as a function of the Richardson number of the flow, ranging from .6 to 4.1, and upstream ... -
Incipient Motion of Shells and Shell Gravel
(American Society of Civil Engineers, 2018)Incipient motion of seashells under a unidirectional flow of water in a horizontal open channel over surfaces with differing roughnesses and shell placements is investigated experimentally. Drag and lift forces are measured ... -
Hydraulic Determination of Dam Releases to Generate Warning Waves in a Mountain Stream: Performance of an Analytical Kinematic Wave Model
(American Society of Civil Engineers, 2018)This study examines the generation of warning waves with prescribed characteristics in a mountain stream. The authors determine which dam release will generate the desired warning wave. They solve this inverse problem ... -
Simulation of Complex Seepage Field of a Gravity Dam Foundation Using a CFD-Based Approach
(American Society of Civil Engineers, 2018)Dam foundation seepage is a major concern for the stability of a hydropower project in southwest China (referred to here as Project X). The complicated geological structure, multiple grouting curtains, and adjustable ... -
Estimation of Discharge through a Levee Breach with Constant Cross Section
(American Society of Civil Engineers, 2018)Levee breaches have resulted in significant damage and loss of life in recent years. Although this area has been of considerable interest to researchers, procedures are not available to compute the breach outflow accurately, ... -
Wall-Porosity Effects on Sediment Deposition and Scour at a Deflector Wall in an Alluvial Channel
(American Society of Civil Engineers, 2018)Many water intakes and diversions are prone to blockage by drifting material, notably vegetation and ice. A way to avert blockage is by means of a deflector-wall and floating debris boom. However, the wall may be subject ... -
Experimental Study on Variable Displacement Radial Piston Pump Performance: Injection Application in Round Pipe Cross-Flow
(American Society of Civil Engineers, 2018)An experimental study has been carried out on the injection of a single piston into a confined cross-flow of a round pipe. Five liters per minute have been used for the cross-flow with various values of injection flows. ... -
Predicting Archimedes Screw Generator Power Output Using Artificial Neural Networks
(American Society of Civil Engineers, 2018)Previous hydraulic studies of Archimedes screw power generators (ASGs) have been mostly at laboratory scale. The validity of scaling up models based on these studies for application in field-scale ASGs has been a major ... -
Rigid Water Column Model for Simulating the Emptying Process in a Pipeline Using Pressurized Air
(American Society of Civil Engineers, 2018)This paper presents a mathematical model for analyzing the emptying process in a pipeline using pressurized air. The rigid water column model (RWCM) is used to analyze the transient phenomena that occur during the emptying ... -
Nonlinear Distribution of Sediment at River Diversions: Brief History of the Bulle Effect and Its Implications
(American Society of Civil Engineers, 2018)One of the fundamental units in fluvial systems is a bifurcation, where an existing channel splits into two. Diversions are a special class of asymmetric bifurcation, in which one of the channels after bifurcation continues ... -
Flow Regimes in a Dropshaft with Limited Air Supply
(American Society of Civil Engineers, 2018)A physical model study was conducted to investigate the flow regimes in a plunging-type dropshaft under the conditions of no air supply and limited air supply. When the top of the dropshaft is sealed, three flow regimes ... -
Approximate Analytical Solutions for the Colebrook Equation
(American Society of Civil Engineers, 2018)Friction factor determination is important for modeling fluid flows in pipes. The Colebrook equation has been widely used for estimating the pipe friction factor in fully developed turbulent regime. Because of the implicit ... -
Mixing of Saline Gravity Current Jet into Ambient Freshwater in Weakly Turbulent Regime
(American Society of Civil Engineers, 2018)This paper investigates mixing of a saline water jet into ambient freshwater at rest in a large basin. Reynolds-averaged Navier–Stokes (RANS) and diffusion-convection equations of the saline water volume fraction are used ... -
Stagnation Reduction in Drinking Water Storage Tanks through Internal Piping with Implications for Water Quality Improvement
(American Society of Civil Engineers, 2018)Poor mixing in storage tanks can cause stagnant zones that could pose negative public health effects. To eliminate stagnant zones in a cylindrical water storage tank, this study investigated the feasibility of a novel ... -
Hydraulic Thresholds to Mitigate Sedimentation Problems at Sangju Weir, South Korea
(American Society of Civil Engineers, 2018)The construction of eight consecutive weirs along the Nakdong River changed the erosion and sedimentation patterns after the Four Major River Restoration Project. This study examines the sedimentation problems upstream of ...