Journal of Hydraulic Engineering: Recent submissions
Now showing items 741-760 of 6886
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Backwater Rise due to Large Wood Accumulations
(American Society of Civil Engineers, 2018)During flood events, transported large wood (LW) may accumulate at river infrastructures or is retained intentionally at retention structures. In both cases, the accumulation results in backwater rise upstream of the clogged ... -
Transient Frequency Responses for Pressurized Water Pipelines Containing Blockages with Linearly Varying Diameters
(American Society of Civil Engineers, 2018)Extended partial blockages in urban water supply systems (UWSS) are formed from complicated physical, chemical, and biological processes; thus, these blockages are commonly in random and nonuniform geometries. The ... -
Improving Stability of Electronically Controlled Pressure-Reducing Valves through Gain Compensation
(American Society of Civil Engineers, 2018)This paper explains the root cause of instabilities that tend to arise in pressure-reducing valves (PRVs) under low-flow conditions. It was found that the loss of stability in PRVs is a direct result of an increase in the ... -
Applicability Analysis of Pier-Scour Equations in the Field: Error Analysis by Rationalizing Measurement Data
(American Society of Civil Engineers, 2018)Previous literature has shown unsatisfactory validation of the existing equations predicting pier-scour depth with laboratory and field data. In an attempt to find the reasons for the unsatisfactory comparisons, we examined ... -
Local Scour at Downstream Sloped Submerged Weirs
(American Society of Civil Engineers, 2018)This paper presents an experimental study of local scour at submerged weirs with different downstream slopes. Thirty-three tests of coarse sand (d5=.85 mm) and 24 tests of fine sand (d5=.26 mm) were carried out in a ... -
Flow Resistance in a Compound Channel with Diverging and Converging Floodplains
(American Society of Civil Engineers, 2018)Experiments were performed in the symmetric compound channel with diverging and converging floodplains for different relative flow depths to investigate the resistance characteristics of overbank flow in nonprismatic ... -
Dynamic Behavior of Entrapped Air Pocket in a Water Filling Pipeline
(American Society of Civil Engineers, 2018)When pipelines are rapidly filled, dynamic and sometimes dramatic air–water interactions often occur. These air–water interactions, along with their associated pressure and temperature oscillations, are explored in this ... -
Developments and Limits of Discrete Vapor Cavity Models of Transient Cavitating Pipe Flow: 1D and 2D Flow Numerical Analysis
(American Society of Civil Engineers, 2018)The paper deals with discrete vapor cavity models (DVCM) to reproduce transient cavitating pipe flows. Since features and limits of the classic DVCM are well known from literature, some developments are here considered and ... -
Residual Strain in a Reservoir Ice Cover: Field Investigations, Causes, and Its Role in Estimating Ice Stress
(American Society of Civil Engineers, 2018)Ice strain dominates the ice thrust and dynamics on reservoir dams and retaining structures. An exclusively designed laser range finder was deployed to measure the surface ice displacements along six directions at a reservoir ... -
Unified Formula for Critical Shear Stress for Erosion of Sand, Mud, and Sand–Mud Mixtures
(American Society of Civil Engineers, 2018)Research on erosion behavior of sediments usually treats sand and mud separately. However, natural soil often occurs as a sand–mud mixture. An expression for cohesive forces in sand–mud mixtures, which considers the effect ... -
Experimental Study of Flow Characteristics in Wedge and Modified Wedge Transitions
(American Society of Civil Engineers, 2018)Water generally leaves a supply reservoir through a narrow rectangular concrete channel and enters a large trapezoidal earthen channel. The two channels are connected by a transition. Among the most common types of ... -
Vectrino Profiler Spatial Filtering for Shear Flows Based on the Mean Velocity Gradient Equation
(American Society of Civil Engineers, 2018)A new methodology is proposed to spatially filter acoustic Doppler velocimetry data from a Vectrino profiler based on the differential mean velocity equation. Lower and upper bounds are formulated in terms of physically ... -
Hydrodynamic Drivers of Juvenile-Salmon Out-Migration in the Sacramento River: Secondary Circulation
(American Society of Civil Engineers, 2018)The entrances to the two lowest-survival migration routes for juvenile Chinook salmon in the tidal Sacramento River are located in the outside of a river bend where secondary circulation occurs. Three-dimensional simulations ... -
Approximation of Fuzzy Membership Functions in Water Distribution Network Analysis
(American Society of Civil Engineers, 2018)Design and analysis of water distribution networks (WDNs) is laden with uncertainty, both aleatory, i.e., natural randomness, such as variations in reservoir elevation heads, and epistemic, i.e., incomplete ... -
Energy Dissipation of a Type III Basin under Design and Adverse Conditions for Stepped and Smooth Spillways
(American Society of Civil Engineers, 2018)New information regarding the influence of a stepped chute on the hydraulic performance of the United States Bureau of Reclamation (Reclamation) Type III hydraulic jump stilling basin is presented for design (steady) and ... -
Mixing of Stratified Flow around Bridge Piers in Steady Current
(American Society of Civil Engineers, 2018)This paper presents the results of an experimental and numerical investigation of the mixing of stratified flow around bridge pier structures. In this study, which was carried out in connection with the Fehmarnbelt Fixed ... -
Quadrant Analysis of Turbulence in a Rectangular Cavity with Large Aspect Ratios
(American Society of Civil Engineers, 2018)By using particle image velocimetry techniques, this paper presents new insights on the turbulence structure and time-averaged flows in a rectangular cavity with large aspect ratios. The three cavity aspect ratios (L/D, ... -
Experimental Evaluation of Advanced Archimedes Hydrodynamic Screw Geometries
(American Society of Civil Engineers, 2018)There is increasing interest in the application of Archimedes hydrodynamic screws (AHS) to generate hydroelectric power. Although numerous theoretical and experimental investigations have been published on this application ... -
Efficient Consolidation Model for Morphodynamic Simulations in Low-SPM Environments
(American Society of Civil Engineers, 2018)This paper presents a new model, using existing consolidation theory, suitable for long-term morphodynamic simulations; we refer to the dynamic equilibrium consolidation (DECON) model. This model is applicable for muddy ... -
Comparison of Calibrated Empirical and Semi-Empirical Methods for Bedload Transport Rate Prediction in Gravel Bed Streams
(American Society of Civil Engineers, 2018)The performance of seven sediment transport equations for bedload transport is compared using almost 2,6 of more than 8, measurements from a recent compilation. Named equations tested include the Meyer-Peter Muller, Barry, ...