Journal of Hydraulic Engineering: Recent submissions
Now showing items 421-440 of 6886
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New Conceptual Framework for the Erosion of Fine Sediment from a Gravel Matrix Based on Experimental Analysis
(ASCE, 9/1/2020 1)An experimental nonintrusive methodology is proposed to estimate the spatially averaged erosion rate of fine sediment from a gravel bed. The experiments performed in a laboratory flume show a progressive slowdown of the ... -
Experimental and Theoretical Study of Local Scour around Three-Pier Group
(ASCE, 10/1/2020 )The prediction of bridge-pier scour has been mostly aimed for a single pier of various sizes, shapes, and alignments with flow. For the case of multiple piers, widely used manuals still recommend using single-pier scour ... -
Performance Optimization of Overshot Water Wheels at High Rotational Speeds for Hydropower Applications
(ASCE, 9/1/2020 1)Overshot water wheels are hydropower converters generally employed for head differences up to 6 m and maximum flow rates of 150−200 L/s per meter width. The maximum hydraulic efficiency (80%–85%) is constant for ... -
Low-Velocity Zone in Smooth Pipe Culvert with and without Streamwise Rib for Fish Passage
(ASCE, 9/1/2020 1)Unimpeded waterway connectivity is a requirement for all freshwater fish. While box culverts are considered the most effective design in terms of upstream fish passage, circular culverts are very common. Detailed hydrodynamic ... -
Flow Patterns and Turbulent Kinetic Energy Budget of Undular Jumps in a Narrow Flume
(ASCE, 9/1/2020 1)This paper presents results obtained from a detailed analysis of the experimental data of three hydraulic jumps with low Froude numbers (1.5–1.9) in a narrow flume. With the increasing Froude number, the three generated ... -
Impacts of Nodal Demand Allocations on Transient-Based Skeletonization of Water Distribution Systems
(ASCE, 9/1/2020 1)Urban water distribution systems (WDSs) are often skeletonized to enable efficient system analysis and management. While different methods are available to account for transient dynamics within the skeletonization processes, ... -
Experimental Investigation of Archimedes Screw Pump
(ASCE, 8/1/2020 1)There is essentially no experimental data on Archimedes screw pump performance available in the literature that is sufficiently detailed for model validation. Experiments were conducted on a laboratory scale (0.3-m diameter) ... -
Inverse Wave Reflectometry Method for Hydraulic Transient-Based Pipeline Condition Assessment
(ASCE, 8/1/2020 1)Established water distribution systems (WDSs) typically consist of pipelines buried underground that are aging and deteriorating, and as such, it is difficult to assess their condition for maintenance and replacement. This ... -
Response of the Minnesota River to Variant Sediment Loading
(ASCE, 9/1/2020 1)We perform an analysis of the response of a reach of the Minnesota River, US to changes in sediment loading, including sand and mud. The reach in question extends 160 km downchannel from Mankato to the confluence with ... -
Eulerian Deposition Model for Sediment Mixture in Gravel-Bed Rivers with Broad Particle Size Distributions
(ASCE, 10/1/2020 )Predicting sediment transport and river morphodynamics is a challenging task in gravel-bed rivers where sediment mixtures have various particle sizes. In this study, we derive a binary packing formula by introducing the ... -
Advection Problems with Spatially Varying Velocity Fields: 1D and 2D Analytical and Numerical Solutions
(ASCE, 8/1/2020 1)The advection equation is one of the most commonly used models in environmental fluid dynamics. Despite this, there exist very few analytical solutions to this equation for the case where the velocity field is spatially ... -
Towards an Operational Flow Forecasting System for the Upper Niagara River
(ASCE, 9/1/2020 1)The authors developed a Hydrologic Engineering Center–River Analysis System (HEC–RAS) model to serve as the key component of a new, first-of-its-kind, short-term operational flow forecasting system for the Niagara River. ... -
Analysis of Pressure Differences and Water Transverse Movement in a Partial-Flip Bucket
(ASCE, 9/1/2020 1)The partial-flip bucket is successfully applied to a spillway outlet design with an approximately 50 m/s flow velocity in Jinping-I Dam in Sichuan, China. The specific design of a part-flipped area on a floor results in ... -
Dam-Break Wave Propagation in Alpine Valley with HEC-RAS 2D: Experimental Cancano Test Case
(ASCE, 6/1/2020 1)Flood modeling by numerical solution of the two-dimensional (2D) shallow-water equations is ordinary practice. HEC-RAS 2D was recently released along with a suite of test cases showing the very good performance of the code ... -
Ranging of Turbulent Water Surfaces Using a Laser Triangulation Principle in a Laboratory Environment
(ASCE, 8/1/2020 1)A measuring system based on laser triangulation for ranging a turbulent water surface in a laboratory environment is presented in this paper. The system is composed of a light detection and ranging (LIDAR) device, serving ... -
Smooth and Stepped Spillway Modeling Using the SPH Method
(ASCE, 8/1/2020 1)The smoothed particle hydrodynamics (SPH) method was used to simulate the flow over smooth and stepped spillways in the nonaerated, skimming flow regime. Two-dimensional numerical simulations were carried out using the ... -
Air Demand of Low-Level Outlets for Large Dams
(ASCE, 8/1/2020 1)Low-level outlets are key safety elements of reservoir dams, especially for structures with high heads. Their main purpose is the regulation and—if required—rapid drawdown of the reservoir water level in case of maintenance ... -
Remote Estimation of Turbulence Intensity Variation in Open Channels
(ASCE, 9/1/2020 1)The open channel flow community has a history of using a set of universal exponential expressions to describe the vertical variation of turbulence intensity in open channel flows. All of these relationships contain an ... -
Axis Switching of Free-Falling Elliptical Water Jets
(ASCE, 7/1/2020 1)This study experimentally investigated the axis switching of free-falling water jets issued from an elliptical nozzle with an aspect ratio of 1.6. High-speed photography was used to capture the flow behaviors. The ... -
Energy Dissipation of Debris Flows over Stepped Gradients and Erodible Beds in Open Channel
(ASCE, 7/1/2020 1)Energy of debris flows in steep mountainous channels is mostly consumed by erosion, collision, and hydraulic jumps due to abrupt topographic changes. In this study, flume experiments were performed to study the energy ...