Journal of Hydraulic Engineering: Recent submissions
Now showing items 321-340 of 6886
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Drag Reduction in Aerated Chute Flow: Role of Bottom Air Concentration
(ASCE, 11/1/2021)Wall shear stress modification in self-aerated flows has been observed in boundary layer–type flows mainly in the form of drag reduction. Due to its complexity, drag reduction has predominantly been studied using experimental ... -
Celerity and Height of Aggradation Fronts in Gravel-Bed Laboratory Channel
(ASCE, 10/1/2021)We present the results of laboratory experiments specifically designed to quantify the height and migration rate of an aggrading gravel front. The experiments were performed in sediment feed mode with constant water and ... -
Dynamic Selection of Exposure Time for Turbulent Flow Measurements
(ASCE, 10/1/2021)The selection of optimum sampling configurations to measure the aspects of turbulent flow of water depends on the variable being measured, the applied measurement technique, the degree of environmental noise, and flow ... -
Longitudinal Dispersion in Unsteady Pipe Flows
(ASCE, 9/1/2021)Temporal concentration profiles resulting from an injected pulse of fluorescent tracer were recorded at multiple locations along a pipe during controlled unsteady flow conditions. A linear temporal change in discharge over ... -
Numerical Model for Convective Flow in Meandering Channels with Various Sinuosities
(ASCE, 11/1/2021)The flow in every meandering channel with a specific sinuosity has its own convective pattern. However, most of the previous numerical works did not take this nature as an essential aspect when validating their computed ... -
Probabilistic Analysis of Debris Motion in Steady-State Currents for Varying Initial Debris Orientation and Flow Velocity Conditions
(ASCE, 9/1/2021)Floodborne debris impact loads depend on several factors, including debris orientation and velocity. Due to the random nature of turbulent flood flows, debris motions are inherently random. This study presents a probabilistic ... -
Performance Similarity between Different-Sized Air Exchange Valves
(ASCE, 10/1/2021)A central element of a pipeline’s air management infrastructure is typically its set of air exchange valves (AEVs), a designation that includes air release and air/vacuum valves. Knowledge of the air mass flow rate as a ... -
Unstable Transients Affecting Flow Assurance during Hydraulic Transportation of Granular Two-Phase Slurries
(ASCE, 9/1/2021)Hydraulic two-phase transport applied in the dredging, mining, and deep-sea mining industries involves the transportation of sand, gravel, polymetallic nodules, or other particulate tailings as a solids phase and water as ... -
Hydraulics of Fluidized Cavities in Porous Matrices: Cavity Heights and Stability for Upward Water Jets
(ASCE, 10/1/2021)Theoretical and experimental results for the evolution of cavities generated by upward vertical leakage jets in porous media are presented. The formulation is based on the conservation principles of mass, momentum, and ... -
Numerical Investigation of Rectangular Pipe Free Overfall for Various Upstream Conditions
(ASCE, 9/1/2021)This paper examines the relationship between the flow rate and outflow depth for flow in a rectangular pipe with the outflow running partially full of a free nappe through a series of computational fluid dynamics (CFD) ... -
Rational Approximation of Unsteady Friction Weighting Functions in the Laplace Domain
(ASCE, 9/1/2021)This paper aims at improving the weighting function based-method (WFB) for modeling the transient behavior of a laminar flow in cylindrical pipes in a one-dimensional approach. Two improvements for the numerical computation ... -
Surface Tension Effects on Discharge Capacity of Coanda-Effect Screens
(ASCE, 8/1/2021)Coanda-effect screens exclude coarse and fine debris from a variety of water intakes. Water overflows an inclined wedge-wire screen with tilted wires that shear high velocity flow from the bottom of the water column. The ... -
Experimental Investigation of Tsunami Bore-Induced Forces on Skewed Deck Girder Section Bridges
(ASCE, 8/1/2021)Tsunamis are among the most destructive natural disasters. Recent major tsunamis in Indonesia (2004), Chile (2010), and Japan (2011) resulted in significant loss of human lives and damage to coastal structures. Damages to ... -
Entrainment of Sediment Particles in Protection Layers
(ASCE, 10/1/2021)Protection layers are often used to prevent scour and erosion, e.g., prevention of scour around wind turbine foundations. However, several cases exist where installed scour protection has settled, where loss of sediment ... -
High-Resolution Nonhydrostatic Outfall Plume Modeling: Cross-Flow Validation
(ASCE, 8/1/2021)Marine outfalls discharge wastewater on the inner shelf and are designed to encourage rapid effluent mixing sufficient to maintain a submerged wastefield. A high-resolution nonhydrostatic Regional Ocean Modeling System ... -
Observations from Contraction–Scour Experiments Conducted with a Large Rectangular Channel
(ASCE, 8/1/2021)This paper presents observations on clear-water and live-bed contraction scour caused by subcritical flow along a large rectangular channel. Three contraction ratios (contraction width/approach–channel width) were used: ... -
Flow Velocity and Water Layer Thickness at Vertical Ring Mesh Structures
(ASCE, 8/1/2021)Vertically assembled ring meshes serve as barriers against explosive threats, in particular when overflowing water completely covers the mesh. The author measured the flow velocity over these structures using Surface ... -
Godunov-Type Solutions for Transient Pipe Flow Implicitly Incorporating Brunone Unsteady Friction
(ASCE, 7/1/2021)An approach combining the Brunone unsteady friction model and first- and second-order Godunov-type scheme (GTS) is developed to simulate transient pipe flow. The exact solution to the Riemann problem calculates the mass ... -
Experimental and Numerical Investigations of Vibration Characteristics Induced by Pressure Fluctuations in a Parallel Operating Pumping System
(ASCE, 7/1/2021)Parallel pumping systems may operate with excessive vibrations as a result of complex hydraulic excitation sources. To remove excessive vibrations, it is essential to understand the relationships between inner hydraulic ... -
Empirical Approach Using Acoustic Doppler Current Profilers for Determining Particle Size Distributions in Estuaries with Highly Concentrated Suspended Matter
(ASCE, 7/1/2021)The backscatter strength provided by multifrequency acoustic systems is frequently used to characterize suspended elements in water courses in the entire water column on a short time scale with high temporal and spatial ...