Journal of Hydraulic Engineering: Recent submissions
Now showing items 541-560 of 6886
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Hydrodynamic and Structural Response Modeling of a Prototype Floating Membrane Reservoir System for Pumped Storage Hydropower
(American Society of Civil Engineers, 2019)Hydrodynamic, computational fluid dynamics, and finite-element modeling were performed for a novel floating membrane reservoir system design for closed-loop pumped storage hydropower application. The conceptual design, ... -
Experimental-Based Methodology to Improve the Design of Vertical Slot Fishways
(American Society of Civil Engineers, 2019)In the context of the restoration of ecological continuity, it is essential to ensure that fishways be as efficient as possible. The biological efficiency of a vertical slot fishway (VSF) is highly dependent on its hydraulic ... -
Upstream Erosion and Sediment Passage at Piano Key Weirs
(American Society of Civil Engineers, 2019)Piano key weirs (PKWs) are a weir type characterized by an effective rating curve. Accordingly, this control structure is primarily applied at dams to increase the spillway capacity. In recent years, PKWs also have been ... -
Nonlinear Bedload Transport Trajectory Angle Expressed in a Traditional Form: Derivation and Application
(American Society of Civil Engineers, 2019)The most common bedload transport calculation methods use an equation for the vector direction that is a linear function of the transverse slope. Existing theoretical formulations that account for nonlinear effects when ... -
Two-Phase PIV-LIF Measurements in a Submerged Bubbly Water Jet
(American Society of Civil Engineers, 2019)A two-phase air-water shear flow generated by a submerged jet and characterized by a relevant void fraction and laden with fluorescent particles has been investigated experimentally by means of particle image velocimetry ... -
Energy Analysis of the Resonant Frequency Shift Pattern Induced by Nonuniform Blockages in Pressurized Water Pipes
(American Society of Civil Engineers, 2019)Blockages in urban water supply systems are commonly formed from various complicated physical, chemical, and biological processes; thus, they usually constrict randomly and nonuniformly along their lengths. Although the ... -
Instability of the Tank-Level Control System of Water Mains in Mountainous Environments
(American Society of Civil Engineers, 2019)The stability of the tank-level controller of hydraulic infrastructures is a complex issue. Past studies have focused on run-of-river hydropower plants with a short penstock, and where the upstream tank level is regulated ... -
Experimental Study on the Propagation and Stability of Tidal Vortices
(American Society of Civil Engineers, 2019)Laboratory studies of tidal vortex formation and propagation through an idealized inlet configuration are presented for various water depths over flat bathymetry. Using surface particle image velocimetry, starting-jet ... -
Turbidity Current Observations in a Large Reservoir Following a Major Wildfire
(American Society of Civil Engineers, 2019)Turbidity currents are generated when denser river water plunges and flows along the bottom of a lake, reservoir, or ocean. The plunging and downstream movement are driven by density differences due to temperature and/or ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Internal Pipe Area Reconstruction as a Tool for Blockage Detection
(American Society of Civil Engineers, 2019)Several pipeline blockage detection methods assume blockages have a regular geometric shape; that is, the blocked section is a pipe of smaller diameter than the original. These methods require a priori knowledge of the ... -
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 ...