Journal of Hydraulic Engineering: Recent submissions
Now showing items 721-740 of 6886
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Side Weir Flow Characteristics: Comparison of Piano Key, Labyrinth, and Linear Types
(American Society of Civil Engineers, 2018)Side weirs are widely used to divert a part of the discharge in irrigation channels and sewer systems. To increase the discharge capacity of linear side weirs at constant length in a channel bank, the application of folded ... -
Friction Modeling of Flood Flow Simulations
(American Society of Civil Engineers, 2018)A new, three-parameter friction model at the boundaries of free surface flow is proposed. The model is valid for all flow and roughness characteristics and it is proposed to replace the widely used Manning equation in the ... -
Finite Release of Debris Flows around Round and Square Piers
(American Society of Civil Engineers, 2018)The impact pressure and force of debris flows on round and square piers were studied experimentally in a flume. Three distinctive flow regimes, namely, Types A, B, and C, were identified. Each debris flow regime has its ... -
Numerical Simulation of a Check Valve Closure Induced by Pump Shutdown
(American Society of Civil Engineers, 2018)High pressure surges induced by the sudden closure of check valves can cause severe damage to mechanical and hydraulic facilities. A three-dimensional unsteady numerical simulation of a dual disc check valve closure induced ... -
Labyrinth Weirs with Angled Approach Flow
(American Society of Civil Engineers, 2018)Current design methods and research have primarily investigated the hydraulic characteristics of labyrinth weirs when the approach flow is perpendicular to the weir axis, a condition consistent with most in-channel and ... -
Condition Assessment of Water Pipelines Using a Modified Layer-Peeling Method
(American Society of Civil Engineers, 2018)Pipe wall condition assessment is critical for targeted maintenance and failure prevention in water distribution systems. This paper proposes a novel approach for condition assessment of water pipelines by adapting the ... -
Dynamic Interaction and Mixing of Two Turbulent Forced Plumes in Linearly Stratified Ambience
(American Society of Civil Engineers, 2018)The hydrodynamics of a two-vent turbulent forced plume propagating in a linear stratification has been studied by a series of laboratory experiments using the two-tank method and the particle image velocimetry (PIV) ... -
Front Velocity and Front Location of Lock-Exchange Gravity Currents Descending a Slope in a Linearly Stratified Environment
(American Society of Civil Engineers, 2018)Gravity currents descending a slope in a linearly stratified environment can be frequently encountered in nature. However, few studies have quantitatively investigated the evolution process of lock-exchange gravity currents ... -
Sampling Interval Analysis and CDF Generation for Grain-Scale Gravel Bed Topography
(American Society of Civil Engineers, 2018)In river hydraulics, there is a continuing need for characterizing bed elevations to arrive at quantitative roughness measures that can be used in flow depth calculations and for improved prediction of fine-sediment transport ... -
Numerical Simulation of Ripple Evolution under Turbulent Flow Using a Coupled LES and DPM Model
(American Society of Civil Engineers, 2018)The processes of ripple evolution are studied through numerical simulation using a coupled computational fluid dynamics (CFD)–discrete particle method (DPM) model with focus on discussing the effect of the size of the ... -
PIV-PLIF Characterization of Nonconfined Saline Density Currents under Different Flow Conditions
(American Society of Civil Engineers, 2018)Saline density currents are a growing environmental concern due to their increasing occurrence generated by brine discharges. The present paper shows an experimental global characterization of the quasi-steady-flow properties ... -
Pressure Wave Velocity in Fluid-Filled Pipes with and without Deposits in the Low-Frequency Range
(American Society of Civil Engineers, 2018)Solid pipeline deposits can be mapped by analyzing reflections of hydraulic pressure pulse waves in the low-frequency range. To determine the amount and position of the deposits, an inverse problem is solved: the pressure ... -
Upper Mississippi River Flow and Sediment Characteristics and Their Effect on a Harbor Siltation Case
(American Society of Civil Engineers, 2018)Upper Mississippi River flow and sediment characteristics downstream of St. Louis are presented in this study. Available and measured data were used to assess a harbor siltation case and dredging needs. Such data are also ... -
Influence of Operational Timing on the Efficiency of Venting Turbidity Currents
(American Society of Civil Engineers, 2018)Reservoir sedimentation is gaining growing attention as dams are aging, due to economic and environmental consequences. Venting of turbidity currents is one of many sediment management techniques, highly recommended when ... -
Implications of River Discharge Angle and Basin Slope on Mouth Bar Morphology and Discharge Dynamics of Stable Jets
(American Society of Civil Engineers, 2018)River mouth bars are strategic morphological units primarily responsible for the development of entire deltaic systems and coastline configuration. Although many works during the last decades analyzed the effects of factors ... -
Effects of Step and Cavity Shapes on Aeration and Energy Dissipation Performances of Stepped Chutes
(American Society of Civil Engineers, 2018)The effects of step edge and cavity shapes on skimming flow properties were investigated in a large-size 45° stepped chute model configured with uniform triangular steps, partially blocked cavities, and chamfers. The focus ... -
Nondimensional Simulation-Based Regression Formulas for Slit Dam Design in Mountain Rivers
(American Society of Civil Engineers, 2018)Compact regression formulas were developed through one-dimensional (1D) unsteady flow numerical model simulations for the analysis of slit dam (SD) hydraulic behavior in torrents. The formulas allow an easy evaluation of ... -
Influence of Sample Holding Time on the Fluvial Erosion of Remolded Cohesive Soils
(American Society of Civil Engineers, 2018)Despite extensive research on bridge scour and channel erosion, predicting the occurrence and rate of cohesive soil erosion remains problematic. The lack of standard procedures for sample preparation and testing has resulted ... -
Experimental Study of Local Scour around a Vertical Cylinder under Wave-Only and Combined Wave-Current Conditions in a Large-Scale Flume
(American Society of Civil Engineers, 2018)A series of physical experiments under wave-only and combined wave-current conditions are conducted in a large-scale wave flume. It is found that waves with strong nonlinearity may lead to downstream movement of the maximum ... -
Evaluation of the Secondary Current Parameter and Depth-Averaged Velocity in Curved Compound Open Channels
(American Society of Civil Engineers, 2018)Simultaneous effects of centrifugal force, floodplain interferences, and variation of the depth-averaged velocity are combined in an analytical model to derive a relationship for estimating the secondary current parameter ...