Journal of Hydraulic Engineering: Recent submissions
Now showing items 401-420 of 6886
-
Dam-Break Flow Measurements of Liquid–Granular Mixtures in a Channelized Reservoir
(ASCE, 12/1/2020 )Dam-break flows of granular materials exhibit a complex non-Newtonian rheology, which is strongly influenced by various factors, such as the characteristics of the granular material, the degree of initial compaction, and ... -
Characterization of Structural Properties in High Reynolds Hydraulic Jump Based on CFD and Physical Modeling Approaches
(ASCE, 12/1/2020 )A classical hydraulic jump with Froude number (Fr1=6) and Reynolds number (Re1=210,000) was characterized using the computational fluid dynamics (CFD) codes OpenFOAM and FLOW-3D, whose performance was assessed. The results ... -
Shock-Fitting Approach for Calculating Air Pocket Entrapment Caused by Full Obstruction in Closed Conduit Transient Flow
(ASCE, 11/1/2020 )This paper studies the ability of a Shock-Fitting approach in computing air pocket entrapments in a closed conduit transient flow, caused by suddenly blocking the downstream end. The flow is pressurized at the upstream, ... -
Modified Bottom Air Entrainment Estimate by Chute Offset Aerator
(ASCE, 11/1/2020 )Offset aerators are a common design for the prevention of cavitation damage to chute spillways. The aeration capacity is linked to the offset air cavity length and jet velocity. Observations suggest that air entrainment ... -
Physically Based Sand Slide Method in Scour Models Based on Slope-Limited Diffusion
(ASCE, 11/1/2020 )In scour simulation models, a sand slide step is necessary to treat the bed areas where the slope exceeds the angle of repose. This exceedance is due to the fact that the Exner equation does not take into consideration the ... -
Second Log-Wake Law from Pipe Symmetry and its Applications in Symmetric and Antisymmetric Channel Flows
(ASCE, 11/1/2020 )The velocity distribution of turbulent pipe flow is often described by the Coles log-wake law that is a superposition of the law of the wall due to the wall shear stress and the law of the wake due to the free turbulence ... -
Leak Detection for Pipelines Using In-Pipe Optical Fiber Pressure Sensors and a Paired-IRF Technique
(ASCE, 10/1/2020 )Leak detection is crucial in reducing water loss and improving the efficiency of water transmission in water distribution systems. A hydraulic transient paired-IRF (impulse response function) technique previously developed ... -
Shock-Capturing Characteristics Models for Transient Vaporous Cavitation in Pipe Flow
(ASCE, 11/1/2020 )This paper deals with models based on the method of characteristics (MOC) to reproduce transient cavitating pipe flows and presents a procedure to enhance such models’ performance. Proper numerical treatments, including ... -
Pipe Burst Detection, Localization, and Quantification Using the Transient Pressure Damping Method
(ASCE, 11/1/2020 )The purpose of this paper is to present a technique for burst detection, localization, and cross-sectional area quantification based on the damping of fluid transients. The Fourier components of the transient signal are ... -
MOC-Z Models for Transient Gaseous Cavitation in Pipe Flow
(ASCE, 11/1/2020 )The paper presents models based on the method of characteristics (MOC) for transient gaseous cavitation in pipe flow. Two predictor-corrector steps are considered, in which only the term pertaining to the gas fraction is ... -
Analytical and Experimental Investigations of Dam-Break Flows in Triangular Channels with Wet-Bed Conditions
(ASCE, 10/1/2020 )Based on the method of characteristics, in this study an analytical solution for one-dimensional shallow-water equations is developed to simulate the instantaneous dam-break flows propagating down a triangular wet-bed ... -
Simplified Model for Oscillatory Flow-Submerged Canopy Interaction
(ASCE, 11/1/2020 )A shear layer at the top of a submerged canopy was analyzed under oscillatory flow driven by free surface waves. By applying a dimensional analysis at the shear layer scale, a simple analytical model that reveals the ... -
Geometric Effects on Discharge Relationships for Labyrinth Weirs
(ASCE, 10/1/2020 )Published labyrinth weir design methods, along with specific site constraints, are typically used to develop an appropriate labyrinth weir geometry (footprint, weir height, wall thickness, apex dimensions, sidewall length, ... -
Neural Network Prediction of Maximum Scour in Bends of Sand-Bed Rivers
(ASCE, 10/1/2020 )Scoured streambeds can undermine revetments built on concave banks in bends of sand-bed rivers formed in alluvium. For this reason, protection work along the banks needs to extend to at least the lowest level reached along ... -
Run-Up of Impulse Wave Trains on Steep to Vertical Slopes
(ASCE, 10/1/2020 )Impulse wave trains are generated by subaerial landslides, rockfalls, or avalanches impacting a water body. Especially in engineered reservoirs, the run-up of waves with small relative heights is critical due to the small ... -
Case Study of Total Dissolved Gas Transfer and Degasification in a Prototype Ski-Jump Spillway
(ASCE, 9/1/2020 1)Gas transfer in dam spillways often leads to supersaturation of total dissolved gases (TDGs) that can cause fish mortality. Quantifying TDG associated with this process is crucial in the development of operating alternatives ... -
Hydraulic Behavior of Progressively Lengthened Mine-Waste Dumps
(ASCE, 10/1/2020 )Essentially, linear mine-waste dumps at open-pit mine sites represent expedient places to deposit large quantities of waste rock. Being placed in valleys in most cases, the effect of the water flowing through the deposit ... -
Estimating Sediment Settling Velocities from a Theoretically Guided Data-Driven Approach
(ASCE, 10/1/2020 )Sediment settling velocities are commonly estimated from analytical or process-based approaches. These approaches have theoretical constraints due to the incompletely resolved settling physics. A parametric data-driven ... -
Simple Formulation of Bedload Sediment Transport Rate Based on Novel Definition of Pickup Probability
(ASCE, 9/1/2020 1)The pickup probability of bedload sediment can be defined as the channel width fraction that is only associated with entrained particles. With this definition, the dimensionless bedload transport rate can be formulated as ... -
Revisiting Riprap Sizing Relationships for Overtopping Flow Conditions
(ASCE, 11/1/2020 )This technical note briefly reviews existing empirical riprap sizing equations for overtopping flow conditions. It then proposes new riprap sizing relationships that focus on the dominant parameters of bed slope and unit ...