Journal of Hydraulic Engineering: Recent submissions
Now showing items 781-800 of 6886
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DENSE: Semicontinuous, Automated, Gravimetric Measurement Device for Suspended Sediment Concentrations
(American Society of Civil Engineers, 2017)Automated, real-time suspended sediment concentration (SSC) measurement techniques are important for the design and operation of hydraulic structures as well as the sediment management of river and reservoir systems. ... -
Eigenfrequency Shift Mechanism due to an Interior Blockage in a Pipe
(American Society of Civil Engineers, 2018)The presence of blockages in water supply systems wastes energy, decreases system performance, and may pose safety concerns. Previous research showing that blockages induce a shift in the resonant frequencies (eigenfrequencies) ... -
Unitary Framework for Hydraulic Mathematical Models of Transient Cavitation in Pipes: Numerical Analysis of 1D and 2D Flow
(American Society of Civil Engineers, 2017)This paper deals with two-phase flow models of transient cavitating pipe flow, showing how bubble-flow models and shallow-water models can be considered in a unitary framework by only changing the geometry of the cross ... -
Bragg-Type Resonance in Blocked Pipe System and Its Effect on the Eigenfrequency Shift
(American Society of Civil Engineers, 2018)Recent studies of measured transient pressure signals showed that eigenfrequencies shift with changes in cross-sectional area of the conduit and used this fact to develop blockage-detection algorithms. However, an understanding ... -
CFD and 1D Approaches for the Unsteady Friction Analysis of Low Reynolds Number Turbulent Flows
(American Society of Civil Engineers, 2017)The aim of this paper is to investigate the complex nature of the transient energy dissipation by using a computational fluid dynamics (CFD) model with a high spatial and temporal resolution together with one-dimensional ... -
Two-Dimensional Finite-Volume Eulerian-Lagrangian Method on Unstructured Grid for Solving Advective Transport of Passive Scalars in Free-Surface Flows
(American Society of Civil Engineers, 2017)A two-dimensional (2D) finite-volume Eulerian-Lagrangian method (FVELM) on unstructured grid is proposed for solving the advection equation in free-surface scalar transport models. A backtracking band is defined along the ... -
Development of a Three-Dimensional Unstructured Mesh Finite-Element Model for Flood Propagation
(American Society of Civil Engineers, 2017)In this paper, a three-dimensional (3D) finite-element model for flooding has been developed, which can be applied to different types of flooding. The theoretical methodology has been introduced in details. The new model ... -
Mass, Energy, and Momentum Flux Analysis of a Bendway Weir
(American Society of Civil Engineers, 2017)Bendway weirs are hydraulic control structures found in watercourses that range in scale from small streams to large rivers. They are designed to be submerged, broad-crested weirs, typically placed in groups on the outer ... -
Detached Eddy Simulation of the Nonaerated Skimming Flow over a Stepped Spillway
(American Society of Civil Engineers, 2017)The unsteady three-dimensional (3D), nonaerated, skimming flow over a stepped spillway is investigated by means of a detached eddy simulation (DES). Special emphasis is placed on the description of the instantaneous velocity ... -
Daily Reservoir Sedimentation Model: Case Study from the Fena Valley Reservoir, Guam
(American Society of Civil Engineers, 2017)A model to compute reservoir sedimentation rates at daily timescales is presented. The model uses streamflow and sediment load data from nearby stream gauges to obtain an initial estimate of sediment yield for the reservoir’s ... -
Finite-Volume Solutions to the Water-Hammer Equations in Conservation Form Incorporating Dynamic Friction Using the Godunov Scheme
(American Society of Civil Engineers, 2017)Although derived from the principles of conservation of mass and momentum, the water-hammer equations integrating dynamic friction are almost never expressed in conservative form. This is because the pressure and volume ... -
Flow-Field Complexity and Design Estimation of Pier-Scour Depth: Sixty Years since Laursen and Toch
(American Society of Civil Engineers, 2017)This paper, written to celebrate the 60th anniversary of the Journal of Hydraulic Engineering, presents a structured, contemporary approach to scour-depth estimation that matches design method practicality to pier flow-field ... -
How Different Cross-Sectional Shapes Influence the Separation Zone of an Open-Channel Confluence
(American Society of Civil Engineers, 2017)A key feature of a schematized open-channel confluence is the separation zone that is present when the tributary flow detaches from the downstream corner of the confluence. This zone of recirculating fluid influences head ... -
Efficient Quasi-Two-Dimensional Water Hammer Model on a Characteristic Grid
(American Society of Civil Engineers, 2016)This note proposes a new quasi-two-dimensional (quasi-2D) numerical scheme for simulating a water hammer that significantly reduces the computational burden compared to two existing quasi-2D schemes, as numerically ... -
Soil and Groundwater Erosion Rates into a Sewer Pipe Crack
(American Society of Civil Engineers, 2017)As sewer pipes age, groundwater and the surrounding soil can enter into the sewer system through various defects on the pipe wall. Groundwater infiltration and soil erosion through cracked sewer pipes can result in increased ... -
Numerical Modeling of Vertical Buoyant Jets Subjected to Lateral Confinement
(American Society of Civil Engineers, 2017)The near-field flow and mixing properties of vertical buoyant jets subjected to lateral confinement are studied numerically for different cases, including different confinement indexes and jet densimetric Froude numbers. ... -
Improved Multiphase Lagrangian Method for Simulating Sediment Transport in Dam-Break Flows
(American Society of Civil Engineers, 2016)In this study, sediment transport is considered as a typical multiphase flow in numerical simulation using a particle-based method and efforts are focused on reducing interface instability between phases. A new multiphase ... -
Analytical Model for Stage-Discharge Prediction in Rectangular Ice-Covered Channels
(American Society of Civil Engineers, 2016)This paper develops an analytical model to predict the stage-discharge relationship for flow in rectangular ice-covered channels. The flow cross section are divided into three subsections on the basis of hydraulic radius ... -
Effects of Geometry on Strong Free-Surface Vortices in Subcritical Approach Flows
(American Society of Civil Engineers, 2016)Strong free-surface vortices are employed extensively in the hydraulic engineering industry in areas such as flow regulation, energy dissipation, and energy generation. Despite their long history of use, the literature on ... -
Spillway Stilling Basins Lining Design via Taylor Hypothesis
(American Society of Civil Engineers, 2016)The paper presents the results from detailed experiments of the statistical structure of turbulence pressure fluctuations at the bottom of hydraulic jumps, with special reference to the spillway stilling basins lining ...