Now showing items 461-480 of 6886
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Field-Scale Numerical Modeling of a Dense Multiport Diffuser Outfall in Crossflow
(ASCE, 1/1/2020 1)A numerical investigation of near-field brine discharge dynamics is reported for the Gold Coast Desalination Plant offshore inclined multiport brine diffuser. Quasi-steady computational fluid dynamics simulations were ... -
Relevance of Free Jet Model for Soil Erosion by Impinging Jets
(ASCE, 2020)The surface erosion of soil samples caused by an impinging jet can be analyzed using the jet erosion test (JET), a standard experimental test to characterize the erosion resistance of soils. This paper specifically addresses ... -
Experimental Study of Impact Pressures on Deep Plunge Pool Floors Generated by Submerged Inclined Jets with Controlled Aeration
(ASCE, 2020)Hydrodynamic pressures on a plunge pool floor due to submerged aerated jets are of interest in many engineering fields. For the present study, dynamic pressures on a deep plunge pool floor due to submerged inclined jets ... -
Theoretical Approach for Shear-Stress Estimation at 2D Equilibrium Scour Holes in Granular Material due to Subvertical Plunging Jets
(ASCE, 2020)The estimation of flow-induced shear stresses acting on the surface of scour holes still represents a challenge for scientists and engineers. From the practical point of view, excessive shear stresses can lead to significant ... -
Large-Flume Tests on Flow Dislodgment of Rocks Forming Bendway Weirs
(ASCE, 2020)This paper presents findings from large-flume tests conducted to determine the velocity magnitudes at which water flow dislodges rocks from bendway weirs (BWs), rock structures used primarily to control thalweg alignment ... -
Effect of Boundary on Water Hammer Wave Attenuation and Shape
(ASCE, 2020)The present study develops a refined water hammer model by postulating the presence of a water jet within the reservoir as the water hammer wave is reflected at the pipe inlet. The waterjet leads to a new boundary expression ... -
Multistage Frequency-Domain Transient-Based Method for the Analysis of Viscoelastic Parameters of Plastic Pipes
(ASCE, 2020)Plastic/viscoelastic pipes such as polyvinyl chloride (PVC), polyethylene (PE), and high-density polyethylene (HDPE) pipes have been increasingly applied in fluid piping systems. The understanding of the hydrodynamic ... -
Structural Changes of Mobile Gravel Bed Surface for Increasing Flow Intensity
(ASCE, 2020)The structure of a mobile bed in a laboratory channel composed of sand and gravel (D50=8 mm) was characterized over a series of experiments with steady flows from a low flow, where only the finer fractions of the bed ... -
Coherent Turbulent Structures within Open-Channel Lateral Cavities
(ASCE, 2020)In the mixing layer at the interface between an open-channel flow and its adjacent lateral open-channel cavity, vortices are periodically shed and advected towards the downstream corner. As these vortices impinge the ... -
Energy-Based Evaluation of 1D Unsteady Friction Models for Classic Laminar Water Hammer with Comparison to CFD
(ASCE, 2020)Under the umbrella of one-dimensional (1D) transient flow analysis, unsteady friction models are popular tools to better represent the decay in pressure signal associated with high wall shear stresses. There are generally ... -
Local Scour and Sediment Deposition at Bridge Piers during Floods
(ASCE, 2020)The local scour and sediment deposition at a bridge pier during flood waves is analyzed to investigate the effects of different flow and sediment regimes (regulated and unregulated discharges with or without excess sediment ... -
Sediment Transport and Bed-Form Characteristics for a Range of Step-Down Flows
(ASCE, 2020)Ephemeral streams with mobile beds represent a challenging environment for sediment transport prediction. Bed topography from relatively infrequent high flow events may persist after hydrograph recession, resulting in ... -
Field Measurement of the Probability of Coarse-Grained Sediment Entrainment in Natural Rivers
(ASCE, 2020)This study takes advantage of recent advances in field-based sediment motion monitoring to report direct field measurements of the bedload pick-up, or entrainment, function in natural gravel-bed channels. Bedload sediment ... -
Fluid-Structure Interaction in Transient-Based Extended Defect Detection of Pipe Walls
(ASCE, 2020)This paper investigates the effect of fluid-structure interaction (FSI) on the efficiency of transient-based reflections analysis (TBRA) applied to the detection of extended deteriorations in a reservoir-pipe-valve system. ... -
Prediction of Mean Axial Velocity of a Free Turbulent Propeller Jet
(ASCE, 2020)Swirling jets induced by propellers have a significant impact on riverine and marine environments. Erosion around quay structures and contaminant dispersion in harbors or along navigation channels are examples of these ... -
Experimental Investigation of the Interaction of Fluid Transients with an In-Line Air Pocket
(ASCE, 2020)Entrapped air blocking the flow in pipeline systems is a common cause of increased pumping costs. At present, air is generally removed via valves or pipeline excavation and drilling. This becomes inefficient in large ... -
Experimental Analysis of Effect of Canal Geometry and Water Levels on Rotary Hydrostatic Pressure Machine
(ASCE, 2020)A rotary hydrostatic pressure machine (RHPM) is a hydropower converter for very low head applications (less than 2.5 m). An RHPM can be installed in straight canals, because its wheel can generate a hydraulic head as ... -
Recommendations for Teaching a Successful Design-Based Course: Hydraulic Structure Design
(ASCE, 2020)Design-based courses often have more latitude with respect to implementing interesting and unique teaching styles and curricula; they can also provide opportunities for broader-context problem solving, thereby improving ... -
Estimation of Cavitation Pit Distributions by Acoustic Emission
(ASCE, 2020)Cavitation erosion in hydraulic machinery, such as in turbines and pumps, often leads to significant reduction of the service life of the affected components, with serious consequences for their maintenance costs and ... -
Numerical and Experimental Study on Mitigation of Storm Geysers in Edmonton, Alberta, Canada
(ASCE, 2020)Geysers can occur in storm sewer systems during heavy storm events, leading to public safety concerns. In this study, a physical model as well as a transient three-dimensional computational fluid dynamic model were used ...