Journal of Hydraulic Engineering: Recent submissions
Now showing items 621-640 of 6886
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Analytical Model for Lateral Depth-Averaged Velocity Distributions in Rectangular Ice-Covered Channels
(American Society of Civil Engineers, 2019)Based on the Reynolds-averaged Navier–Stokes equations and the Shiono and Knight method, this paper describes the development of an analytical model to predict the lateral distribution of depth-averaged velocities in steady ... -
Mitigation Techniques for Nappe Oscillations on Free-Overfall Structures
(American Society of Civil Engineers, 2019)Nappe oscillation is a phenomenon that can have an undesirable impact to the local environment (e.g., nearby residences, and parks) as the phenomenon has been observed to produce a significant level of noise caused ... -
Influence of Hole Geometry and Position in Leaking Pipes under Combined Pressure and Bending Regimes
(American Society of Civil Engineers, 2019)Strategies to reduce leakage based on integrated systems of monitoring and management of the pressure levels and related anomalies are acknowledged as the most reliable and cost-effective techniques to improve the efficiency ... -
Length for Uniform Flow Development in a Rough Laboratory Flume
(American Society of Civil Engineers, 2019)Uniform flow is important for physical model studies because generalizing flow data is possible only if the collected data is from locations where the flow is uniform, i.e., the test section. Presented in this paper ... -
Scour Reduction by Air Injection at a Cylindrical Bridge Pier: Experimental Determination of Optimal Configuration
(American Society of Civil Engineers, 2019)To reduce bridge scour-induced collapse, experiments were performed to determine the optimal ratio of air to water velocity values for the least amount of scour at a cylindrical bridge pier. Clear-water experiments were ... -
Simulation of Surge Reduction Systems Using Dimensionally Reduced Models
(American Society of Civil Engineers, 2019)The focus of this paper is to study transient flow processes in a trunk oil pipeline initiated by a sudden stoppage of a pumping station equipped with an overpressure protection system. Our analysis is based on a dimensionally ... -
Model for Total Dissolved Gas Supersaturation from Plunging Jets in High Dams
(American Society of Civil Engineers, 2019)The total dissolved gas (TDG) supersaturation that results from dam spillage may cause adverse effects, including increases in the risk of gas-bubble disease and mortality in fish. The accurate prediction of TDG levels is ... -
Modified Sediment Pick-Up Function
(American Society of Civil Engineers, 2019)This paper addresses the sediment pick-up process in the high-velocity range of 2–6 m/s. An existing sediment pick-up function was recalibrated and modified using data of new experiments in a closed pipeline circuit with ... -
Hydraulic Disturbance in Multiturbine Hydraulically Coupled Systems of Hydropower Plants Caused by Load Variation
(American Society of Civil Engineers, 2019)This study focuses on the output variation and dynamic behavior of hydroturbines in a hydraulically coupled system under hydraulic disturbance. The theoretical formula predicting the output variation of operating turbines ... -
Comparative Hydrodynamic Study of Rigid-Lid and Level-Set Methods for LES of Open-Channel Flow
(American Society of Civil Engineers, 2019)Computational modeling of open-channel flows at low Froude (F) numbers is often carried out using the rigid-lid assumption to prescribe the water surface location. However, the presence of wall-mounted hydraulic structures ... -
Modeling Subaqueous and Subaerial Muddy Debris Flows
(American Society of Civil Engineers, 2019)Debris flows are notorious geohazards existing in both subaerial and subaqueous environments. They may cause catastrophic destructions to adjacent life and properties along their overriding path. As such, predictions of ... -
Pipeline Leak Detection Using the Matched-Field Processing Method
(American Society of Civil Engineers, 2018)A transient-based leakage detection method using a matched-field processing (MFP) scheme is formulated and applied. It is found to be efficient, robust, accurate, and provides a unique solution. Its inherent efficiency ... -
Estimation of Longitudinal Dispersion Coefficient in Ice-Covered Rivers
(American Society of Civil Engineers, 2018)Flow structure and dispersion characteristics change significantly in ice-covered channels and rivers, and the longitudinal dispersion coefficient is an important parameter for water pollution control and environmental ... -
Analytical Solution of k-ϵ Model for Nonuniform Flows
(American Society of Civil Engineers, 2018)An analytical solution of the standard k-ϵ model is proposed to study the turbulent characteristics of nonuniform flow. Initially, the most suitable functional forms are assumed for turbulent kinetic energy, k, turbulence ... -
Experimental Investigation of a Francis Turbine during Exigent Ramping and Transition into Total Load Rejection
(American Society of Civil Engineers, 2018)This study investigates the unsteady pressure fluctuations in a hydraulic turbine observed during a dangerous case of steep ramping interrupted by an unexpected transition into total load rejection. Although hydraulic ... -
Pressure Surge Suppression Using a Metallic-Plastic-Metallic Pipe Configuration
(American Society of Civil Engineers, 2018)Plastic pipes [e.g., polyvinyl chloride (PVC) or high density polyethylene (HDPE)] are commonly used to replace aging metallic pipe sections (e.g., cast iron) in water-distribution networks. However, our understanding ... -
Behaviors of Bubble-Entrained Plumes in Air-Injection Artificial Upwelling
(American Society of Civil Engineers, 2018)This paper studies bubble-entrained plume (BEP) behaviors in a crossflow and proposes a theoretical approach for predicting BEP trajectories and the separation points from the bubble swarm. When rising in a crossflow, the ... -
Godunov-Type Solutions with Discrete Gas Cavity Model for Transient Cavitating Pipe Flow
(American Society of Civil Engineers, 2018)To simulate transient cavitating pipe flow, the discrete gas cavity model (DGCM) is combined with first-order and second-order finite-volume method (FVM) Godunov-type schemes. The earlier discrete vapor cavity model (DVCM) ...