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Full-Text Articles in Engineering
Hazards At Low-Head Dams, Riley J. Olsen, Michael C. Johnson
Hazards At Low-Head Dams, Riley J. Olsen, Michael C. Johnson
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: Low-head dams are small structures that are built for many purposes, the most common being to impound small amounts of water for various uses. At certain flow conditions, a dangerous countercurrent, known as a roller, can form downstream of a low-head dam. This current possesses an upstream directed surface velocity that can effectively trap debris, as well as unsuspecting humans, at the downstream side of the dam. It is this current that is responsible for the deaths of many individuals that have ventured too close to these structures over the years. It is the objective of this study to …
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 1, Adam Witt, Fadi Wakim, Nathan Christensen
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 1, Adam Witt, Fadi Wakim, Nathan Christensen
International Junior Researcher and Engineer Workshop on Hydraulic Structures
No abstract provided.
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 3, Maria Trujillo, Bryan Heiner, Francois Rulot
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 3, Maria Trujillo, Bryan Heiner, Francois Rulot
International Junior Researcher and Engineer Workshop on Hydraulic Structures
No abstract provided.
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 5, Mohanad Khodier, Adam Witt, Maria Trujillo, Iordanis Moustakidis, Francois Rulot
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 5, Mohanad Khodier, Adam Witt, Maria Trujillo, Iordanis Moustakidis, Francois Rulot
International Junior Researcher and Engineer Workshop on Hydraulic Structures
No abstract provided.
Measurement Of Turbulence In Pressurized Pipe Flow Using Particle Image Velocimetry, Josh Mortensen
Measurement Of Turbulence In Pressurized Pipe Flow Using Particle Image Velocimetry, Josh Mortensen
International Junior Researcher and Engineer Workshop on Hydraulic Structures
Abstract: Invasive mussel species can cause problems at a variety of water resource facilities by colonizing within piping systems, significantly reducing flow capacity. Exposing mussels to intense turbulence as they enter the system may be effective in reducing mussel settlement downstream. To quantify turbulence in a pressurized pipe, Particle Image Velocimetry (PIV) measurements were made downstream of a newly developed pipe fitting designed to generate intense turbulence for mussel control. Two-dimensional (2D) velocity data were collected throughout the pipe profile at various distances downstream of the fitting and were analyzed to quantify hydrodynamic properties of the turbulent flow including dissipation …
Pumping Systems With Variable Reference Head: The Non-Visualized Problems, Boris Rodriguez C., Astrid Pérezo O., José Manuel Adriasola V.
Pumping Systems With Variable Reference Head: The Non-Visualized Problems, Boris Rodriguez C., Astrid Pérezo O., José Manuel Adriasola V.
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: In several industries, like the mining business, it is very common to observe high head pumping systems, which transport water to more than one discharge point. These discharge points could have, in some cases, variable discharge pressures and, furthermore, could be utilized as water sources (a water reservoir, for example) for other facilities using the same pipes that feed them (flow in double direction). Because of this particular design, the pumping systems can have different Total Dynamic Head (TDH) depending on the water level in the reservoir(s), resulting in a complication for the design and operation of the pumping …
Mean Velocity Effect In Bio-Fouled Pipes, Maria Ximena Trujillo, Juan Saldarriaga
Mean Velocity Effect In Bio-Fouled Pipes, Maria Ximena Trujillo, Juan Saldarriaga
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: The hydraulic resistance of pipes with biofilm surface coatings can be difficult to predict based on smooth-wall pipe theory. The impacts of biofilm growth in distribution networks and the influence of mean velocity in their development were studied in a recirculation model system at the Hydraulic Laboratory of Universidad de los Andes, using as nutrient a grass specie called “kikuyu” (s.p. Pennicetum clandestine), which is common in raw water sources of Bogotá, Colombia. Water flowed constantly through the system during 150 days, and biofilm measurements were taken from monitors installed on the pipe’s wall. Bio-fouling was observed for various …
Heat Exchanger System Piping Design For A Tube Rupture Event, Fadi Antoine Wakim, Pinar Cakir Kavcar, Mustafa Samad
Heat Exchanger System Piping Design For A Tube Rupture Event, Fadi Antoine Wakim, Pinar Cakir Kavcar, Mustafa Samad
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: Tube-rupture events in shell and tube heat exchangers can result in significantly high surge pressures. Steady state and dynamic methods can be used to assess the impacts of these events on heat exchanger system piping networks. This paper presents the findings of a set of dynamic surge simulations on the impacts of tube-rupture events in a Propane-Feed Gas Heat Exchanger System. Once adjacent piping design is considered, the Joukowsky formulation-based method is not always appropriate to estimate tube-rupture surge impacts. Dynamic simulations need to be conducted to assess the tube-rupture impact on piping systems due to the surge wave …
Water Level Sensors, What Works?, Bryan J. Heiner, Thomas W. Gill
Water Level Sensors, What Works?, Bryan J. Heiner, Thomas W. Gill
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: Water level sensors come in all shapes, sizes, and types and can range in price from a couple hundred to several thousand US dollars. This project utilizes real world examples from around the western United States to determine what level sensors work well and to document what characteristics may prevent them from providing accurate water level measurements in differing climates. Researchers have developed a calibration procedure that can be used in field or laboratory situations to obtain accurate calibrations of multiple types of water level sensors. Sensors that have been calibrated and installed are being monitored to determine their …
Cavitation In Hydraulic Structures-Bridging The Gap Between The Laboratory And The Real World, K. Warren Frizell
Cavitation In Hydraulic Structures-Bridging The Gap Between The Laboratory And The Real World, K. Warren Frizell
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: Recollections of a thirty-five-year career at the hydraulic laboratory of the Bureau of Reclamation are presented within the context of using all the tools at your disposal to reach the best possible answer to your research questions. Cavitation in hydraulic structures will be the main topic used to illustrate this premise, using historic examples and current research to demonstrate study approaches, testing techniques, and applied solutions to real world problems.
Conference Proceedings, Blake Tullis, Robert Jansson
Conference Proceedings, Blake Tullis, Robert Jansson
International Junior Researcher and Engineer Workshop on Hydraulic Structures
No abstract provided.
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 2, Francois Rulot, Riley Olsen, Gonzalo Duró
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 2, Francois Rulot, Riley Olsen, Gonzalo Duró
International Junior Researcher and Engineer Workshop on Hydraulic Structures
No abstract provided.
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 4, Gonzalo Duró, Mitch Dabling, Josh Mortensen, Boris Rodriguez, Fadi Wakim
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 4, Gonzalo Duró, Mitch Dabling, Josh Mortensen, Boris Rodriguez, Fadi Wakim
International Junior Researcher and Engineer Workshop on Hydraulic Structures
No abstract provided.
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 6, Boris Rodriguez, Josh Mortensen, Riley Olsen, Nathan Christensen, Mitch Dabling, Gonzalo Duró
International Junior Researcher And Engineer Workshop On Hydraulic Structures Session 6, Boris Rodriguez, Josh Mortensen, Riley Olsen, Nathan Christensen, Mitch Dabling, Gonzalo Duró
International Junior Researcher and Engineer Workshop on Hydraulic Structures
No abstract provided.
Staged And Notched Labyrinth Weir Hydraulics, Mitchell R. Dabling, Brian M. Crookston
Staged And Notched Labyrinth Weir Hydraulics, Mitchell R. Dabling, Brian M. Crookston
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: Replacement spillways are frequently required to pass revised and larger design storm events. Generally matching the outflow hydrograph of the existing spillway is also a common design requirement. Labyrinth spillways can increase spillway discharge capacity. Staged and notched sections of crest have been used in design to satisfy discharge hydrograph requirements. However, inadequate hydraulic design information is available specific to staged and notched labyrinth weirs. In this study, the flow characteristics of multiple staged and notched labyrinth weir configurations (laboratory-scale) were tested. Head-discharge relationships were evaluated experimentally and compared with computed results using superposition (predicting the discharge over the …
Physical Modeling And Cfd Comparison: Case Study Of A Hydro-Combined Power Station In Spillway Mode, Gonzalo Duró, Mariano De Dios, Alfredo López, Sergio O. Liscia
Physical Modeling And Cfd Comparison: Case Study Of A Hydro-Combined Power Station In Spillway Mode, Gonzalo Duró, Mariano De Dios, Alfredo López, Sergio O. Liscia
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: This study presents comparisons between the results of a commercial CFD code and physical model measurements. The case study is a hydro-combined power station operating in spillway mode for a given scenario. Two turbulence models and two scales are implemented to identify the capabilities and limitations of each approach and to determine the selection criteria for CFD modeling for this kind of structure. The main flow characteristics are considered for analysis, but the focus is on a fluctuating frequency phenomenon for accurate quantitative comparisons. Acceptable representations of the general hydraulic functioning are found in all approaches, according to physical …
Using Particle Image Velocimetry (Piv) System In Fish Passage Through Rehabilitated Culverts, Mohanad Khodier, Blake P. Tullis
Using Particle Image Velocimetry (Piv) System In Fish Passage Through Rehabilitated Culverts, Mohanad Khodier, Blake P. Tullis
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: The Particle Image Velocimetry (PIV) system was used to investigate fish passage behaviour through a circular, 0.61-m diameter pipe with evenly spaced baffles along the invert. A section of the pipe wall between two adjacent baffles was replaced with a transparent window (Lexan) and a water box placed outside of the pipe to create a tested section. The test was conducted for different pipe slopes 0.5, 1.5, 2.5, and 3.5%. For each slope, the pipe was tested for different flow rates 28.3, 56.6, and 85 l/s. Also, the PIV was used to produce the velocity vector field by post-processing …
The Effect Of Boulder Spacing On Flow Patterns Around Boulders Under Partial Submergence, Iordanis Moustakidis, Athanasios Papanicolaou, Achilleas Tsakiris
The Effect Of Boulder Spacing On Flow Patterns Around Boulders Under Partial Submergence, Iordanis Moustakidis, Athanasios Papanicolaou, Achilleas Tsakiris
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: This study focuses on documenting the influence of boulder spacing on flow patterns within an array of boulders in mountain streams. Boulder arrays modify the flow structures in their vicinity, which in turn regulate the depositional patterns. However, a critical literature review reveals that the effects of boulder spacing on flow have been overlooked. Herein, we hypothesize that the developing flow structures around boulders are controlled by the boulder spacing. The objective of this study is to map the surface flow structures around partially submerged boulders for two different boulder spacing scenarios: (1) λ/dc = 6 and (2) …
Dealing With Sedimental Transport Over Partly Non-Erodible Bottoms, François Rulot, Benjamin Dewals, Pierre Archambeau, Michael Pirotton, Sébastien Erpicum Hece
Dealing With Sedimental Transport Over Partly Non-Erodible Bottoms, François Rulot, Benjamin Dewals, Pierre Archambeau, Michael Pirotton, Sébastien Erpicum Hece
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: In depth-averaged flow and morphodynamic models using a finite volume discretization based on explicit time integration, a specific difficulty can arise during a computation: the computed sediment level can become lower than the level of a non-erodible bottom. The original developments presented in this paper enable correction of the non-physical sediment levels. The method, based on iterative limitation of the outward fluxes, is perfectly mass conservative and remains computationally efficient. The resulting model has been validated with several 1D benchmarks leading to configurations with sediment transport over a nonerodible bottom. Two interesting experimental benchmarks are highlighted in this paper …