Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Utah State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 7051 - 7080 of 57396

Full-Text Articles in Entire DC Network

Hydraulic Performance Of Piano Key Weir With Linear And Curvilinear Profiles Of Outlet Keys, Prakash Kumar Sinha, Binit Kumar, Zulfequar Ahmad Oct 2022

Hydraulic Performance Of Piano Key Weir With Linear And Curvilinear Profiles Of Outlet Keys, Prakash Kumar Sinha, Binit Kumar, Zulfequar Ahmad

International Symposium on Hydraulic Structures

With rising demand for storing water in reservoirs, many spillways require modification by optimizing their shape for enhancing their discharge capacity. A Piano Key Weir (PK weir) is a modified weir and it is installed at the dams to augment the discharge capacity of the weir. Due to different geometrical configurations of PK weirs, the hydraulic performance of the weir is still in evolving research. In this study, hydraulic performance of two different models of PK weir is studied experimentally. All the configurations of both the PK weir are same except the shape of the outlet keys. The outlet key …

Go to article

River Aggradation-Degradation Under Sand Mining: Experimental And Numerical Studies, Nejib H. Abdullahi, Zulfequar Ahmad Oct 2022

River Aggradation-Degradation Under Sand Mining: Experimental And Numerical Studies, Nejib H. Abdullahi, Zulfequar Ahmad

International Symposium on Hydraulic Structures

Sand mining from the river for different purposes is a common cause of the failure of hydraulic structures. Its presence in a river causes intense bedload transport, which is crucial for designing and operating hydraulic structures. The flow characteristics and aggradation-degradation phenomenon in the vicinity of the sand mining pit have been analyzed with experimental and numerical approaches. The bed level evolution in the vicinity of the pit was measured using a pointer gauge for different temporal and equilibrium stage conditions. A numerical simulation was done using a three-dimensional computational fluid dynamics model, Flow-3D, which was used to compute the …

Go to article

2-D Simulation Of Flow Structures Over Dunes For Flow Characteristics Estimation, Mohammad Sharifi, Mohammad Reza Majdzadeh Tabatabai, Seyed Hossein Ghoreishi Najafabadi Oct 2022

2-D Simulation Of Flow Structures Over Dunes For Flow Characteristics Estimation, Mohammad Sharifi, Mohammad Reza Majdzadeh Tabatabai, Seyed Hossein Ghoreishi Najafabadi

International Symposium on Hydraulic Structures

Rivers have undulated beds, which are called bedforms. Depending on the hydraulic conditions, the bedforms have different types that cause resistance in the flow. Despite various research and experiments on bedforms, the topic is still debatable and requires further research. The present study is mainly focused on simulating the flow motion numerically on dunes in open channels to evaluate the effect of dune geometry on flow structure. Twenty-nine simulations were conducted to study the effect of the geometry of five types of dunes with different angles and heights under different hydraulic conditions and bed roughnesses. RANS and DES turbulence models …

Go to article

Predicting Riverbed Deformation During Floods For A Sustainable Design Of Headworks Structures, I. Joshi, U. Singh, M. B. Bishwakarma, Y. Kitamura, L. Lia Oct 2022

Predicting Riverbed Deformation During Floods For A Sustainable Design Of Headworks Structures, I. Joshi, U. Singh, M. B. Bishwakarma, Y. Kitamura, L. Lia

International Symposium on Hydraulic Structures

Understanding and predicting riverbed deformation during floods is important for the proper and sustainable design of headworks structures. Field-scale study of floods is challenging, and existing literature shows that mainly qualitative data (Photographic and Videographic) have been used in riverbed deformation studies. On the other hand, laboratory experiments allow studying floods in more detail and under a controlled environment. In this research, bed deformation of river channel during floods was investigated by conducting experiments in a curved flume. Parameters of the experiments were chosen with respect to gravel-cobbled River in Nepal. Four different floods with different magnitudes and durations were …

Go to article

An Experimental Study On Scour At Zero Degree Confluent Channels, Mohd Faisal Ansari, Mohammad Aamir, Zulfequar Ahmad Oct 2022

An Experimental Study On Scour At Zero Degree Confluent Channels, Mohd Faisal Ansari, Mohammad Aamir, Zulfequar Ahmad

International Symposium on Hydraulic Structures

This paper presents an experimental study on scour depth at the confluence of a mobile and a rigid bed open channel. Substantial momentum difference between the confluent channels controls flow hydrodynamics and mixing in the confluence hydrodynamic zone. Scour at the confluence of the channels is a threat to the stability of the structure separating the two channels. Results for bed morphology and maximum scour depth at the confluence for different hydraulic and geometric conditions in the channels are presented. Data analysis shows that the discharge ratio (ratio of discharge in mobile bed and total discharge downstream) and tailwater conditions …

Go to article

Commemorative Plaque, Bringing War Home Oct 2022

Commemorative Plaque, Bringing War Home

Bringing War Home Collection

The plaque was given to everyone in the very elite unit when they left Vietnam. Made of metal, wood and enamel in good, functional condition. Mass-produced and handmade by unknown maker, time, and location. Participant ID_00046, Object ID_00123

Go to article

Photographs Vietnam Agricultural Advisor, Bringing War Home Oct 2022

Photographs Vietnam Agricultural Advisor, Bringing War Home

Bringing War Home Collection

The photographs were taken during the AG Advisor Period (AG Advisor), whose role was to collaborate with local agricultural officials and foster positive sentiment towards the United States among the local population while stationed in Vietnam. Made of paper and photograph in good, functional condition. Handmade between 1962-63. Participant ID_00046, Object ID_00117

Go to article

Bracelet, Bringing War Home Oct 2022

Bracelet, Bringing War Home

Bringing War Home Collection

Given to the participant by aboriginal people in a ceremony on induction into the tribe. Handmade of metal in good, functional condition. Participant ID_00046, Object ID_00118

Go to article

Effect Of Diameter And Inlet-Depth On Hydro-Suction Performance Of A Suction Pipe, A. Jaiswal, Z. Ahmad, S. K. Mishra Oct 2022

Effect Of Diameter And Inlet-Depth On Hydro-Suction Performance Of A Suction Pipe, A. Jaiswal, Z. Ahmad, S. K. Mishra

International Symposium on Hydraulic Structures

Sedimentation in rivers and reservoirs leads to inundation of surrounding areas, topsoil degradation, low depth for navigation, loss of reservoir capacity, etc. Hydro-suction is a process of sediment removal in which sediment is sucked along with water using a suction pipe placed vertically on/above/below the sediment bed. This paper deals with the effect of diameter and inlet-depth of suction pipe on performance of hydro-suction. A series of experiments are performed using five suction pipes of diameter of 5.08×10-2 m, 7.62×10-2 m, 10.16×10-2 m, 12.70×10-2 m, and 15.24×10-2 m, placed at inlet depth of 0.015 m and 0.03 m, under discharge …

Go to article

Introduction And Investigation Of A Large-Scale Piano Key Weir Fabricated Via Rapid Prototyping, M. Oertel, B. Belay, X. Shen, H. Willems Oct 2022

Introduction And Investigation Of A Large-Scale Piano Key Weir Fabricated Via Rapid Prototyping, M. Oertel, B. Belay, X. Shen, H. Willems

International Symposium on Hydraulic Structures

Piano key weirs (PKW) are novel hydraulic structures, characterized by an increased discharge capacity, compared to regular weirs. Through the last decades, experimental studies have mainly focused on efficiency aspects and design regulations. Therefore, often small scaled experiments were conducted in hydraulics laboratories in which model geometries were produced with materials like acrylic glass. But also in recent practices, 3D printing techniques are being used to plot small-scaled piano key weir configurations up to 30 or 40 cm width. The present investigation focuses on a large-scale 3D printed PKW with a total width of 1 m featuring quarter round crest …

Go to article

Bed Load Computation For Gravel Particles In Gravel-Silt Mixture, U. K. Singh, S. Kumar, Z. Ahmad Oct 2022

Bed Load Computation For Gravel Particles In Gravel-Silt Mixture, U. K. Singh, S. Kumar, Z. Ahmad

International Symposium on Hydraulic Structures

Fluvial hydraulics deals with the process of erosion, transportation, and deposition of sediment in channels by the action of flowing water. This paper presents experimental results on bed load transport rate of gravel particles transported from mobile channel bed made of gravel-silt mixture. Gravel and sand particles were observed transported as bed load due to their coarser size while silt transported as suspended load. Bed load was collected at regular time interval of like 15 minutes, 30 minutes, 60 minutes, etc. Bed surface profile and water surface profile were measured spatially at an interval of 50 cm at the center …

Go to article

Preliminary Analysis Of The Effect Of Worked Wood Piles In Straight Channels, Deep Roy, Simone Pagliara Oct 2022

Preliminary Analysis Of The Effect Of Worked Wood Piles In Straight Channels, Deep Roy, Simone Pagliara

International Symposium on Hydraulic Structures

Eco-friendly low-head structures such as blunt nosed chevrons, wood bundles, worked wood piles etc. provide an effective solution to ensure grade and sediment load control in rivers, as well as to introduce morphological variations in the channel bed promoting biodiversity. Worked wood piles are usually installed near the outer bank in order to redirect the flow away from it, thus stabilizing the basin. Moreover, these structures increase the natural organic content in channels and create pronounced scour and dune features in their vicinity, giving shelter to a host of aquatic organisms and fish species. However, till date, a comprehensive analysis …

Go to article

Dak To Photographs, Bringing War Home Oct 2022

Dak To Photographs, Bringing War Home

Bringing War Home Collection

Photographs in good, functional condition. Of unknown production, maker, time, and location. Participant ID_00046, Object ID_00124

Go to article

Pipe, Bringing War Home Oct 2022

Pipe, Bringing War Home

Bringing War Home Collection

Given to the participant by aboriginal peoples as a gift. Handmade of metal and wood in good, functional condition. Participant ID_00046, Object ID_00119

Go to article

Machete And Sheath, Bringing War Home Oct 2022

Machete And Sheath, Bringing War Home

Bringing War Home Collection

Made of metal and plastic in good, functional condition. Mass-produced by the US Military contractor in the 1960s. Participant ID_00046, Object ID_00121

Go to article

Shrapnel, Bringing War Home Oct 2022

Shrapnel, Bringing War Home

Bringing War Home Collection

Pieces of shrapnel were found in the participant's bed after a shelling attack. Made of metal in fair, non-functional condition. Mass-produced by an unknown maker, time, and location. Participant ID_00046, Object ID_00122

Go to article

Local Scour Downstream Of Type-A Trapezoidal Piano Key Weir, Ch. A. Chooplou, A. Ghafouri, M. Ghodsian, M. Vaghefi Oct 2022

Local Scour Downstream Of Type-A Trapezoidal Piano Key Weir, Ch. A. Chooplou, A. Ghafouri, M. Ghodsian, M. Vaghefi

International Symposium on Hydraulic Structures

A major issue with weirs over erodible beds is the scour downstream, which can seriously challenge their stability. This paper presents experimental results on trapezoidal type-A piano key weirs having two values of bottom slopes keys (28o and 47o). Experiments were conducted in a recirculating channel 10 m long, 0.75 m wide and 0.8 m high. Approach flow depths in the range of 0.032 to 0.07 m, and tailwater depths in the range of 0.08 to 0.18 m were evaluated. It was observed that the bottom slope of weir keys significantly influences the scour depth, such that a 67.8% increase …

Go to article

Experimental Study On Three-Dimensional Velocity Near Piano Key Weirs, Binit Kumar, Zulfequar Ahmad Oct 2022

Experimental Study On Three-Dimensional Velocity Near Piano Key Weirs, Binit Kumar, Zulfequar Ahmad

International Symposium on Hydraulic Structures

A Piano key weir (PK weir) is a non-rectilinear spillway commonly used to augment the discharge capacity at the dams and diversion structures. Installation of such hydraulic structures may alter the flow characteristics, sediments transport and sedimentation in the river channels. The present study deals with an experimental investigation of three dimensional velocities near the two different laboratory models of PK weir having noses with an outlet overhangs. The purpose of this study is to observe the flow field in the vicinity of a one-cycle and two-cycle PK weir to understand the flow behavior of the weir that may be …

Go to article

Predicting Density-Driven Exchange Flows Through The West Crack Breach Of The Great Salt Lake Causeway With Cfd And Ann, B. M. Crookston, M. Rasmussen, E. Larsen, H. Kartchner, S. Dutta Oct 2022

Predicting Density-Driven Exchange Flows Through The West Crack Breach Of The Great Salt Lake Causeway With Cfd And Ann, B. M. Crookston, M. Rasmussen, E. Larsen, H. Kartchner, S. Dutta

International Symposium on Hydraulic Structures

The Great Salt Lake is of environmental and economic value yet is threatened by various factors including drought and water diversion for irrigation purposes. Management efforts are required to preserve this saline lake; such efforts include accurately estimating the exchange flow through an opening in a railroad causeway that divides the lake. This study investigated two modeling approaches for predicting these discharges, a physics-based computational fluid dynamics model and a data-driven artificial neural network model. Good agreement was found between both models, and the advantages each provides to water management efforts are noted. Results indicate that, regardless of the modeling …

Go to article

Hydrodynamics Of Permeable Horseshoe Obstacle In Fluvial Environment: A Physical Modelling, H. Chanson, H. K. Lee, W. Johnson Oct 2022

Hydrodynamics Of Permeable Horseshoe Obstacle In Fluvial Environment: A Physical Modelling, H. Chanson, H. K. Lee, W. Johnson

International Symposium on Hydraulic Structures

Along Australian inland waterways, a number of man-made horseshoe obstacles were built for centuries. The permanent structures interacted with the streamflow across a wide range of water discharges including when they are fully-submerged. Their use ranged from water holes and fish trap at low to moderate flows, to large bed roughness and turbulent manipulation at large water discharges. The aim of the study was to gain a sound physical understanding of the hydraulic operation of horseshoe obstacle across a broad range of submergence ratio, ranging from low flows and emergent obstacle to major floods with fully-submerged structures. In this laboratory …

Go to article

Near-Full-Scale Physical Modelling And Open-Channel Flow Velocity In A Fish-Friendly Culvert With Full-Height Sidewall Baffles, J. Hu, Y. Li, H. Chanson Oct 2022

Near-Full-Scale Physical Modelling And Open-Channel Flow Velocity In A Fish-Friendly Culvert With Full-Height Sidewall Baffles, J. Hu, Y. Li, H. Chanson

International Symposium on Hydraulic Structures

A near-full-scale physical modelling was performed on the oscillation and instability of open-channel flow in a fish-friendly culvert equipped with full-height sidewall baffles. High-resolution measurements of the instantaneous flow velocity were conducted using a Vectrino+ acoustic Doppler velocimeter (ADV). The physical results were marked by the existence of some low-frequency seiche phenomenon. A well-established triple decomposition technique was applied to the time series of free-surface and velocity time-series. The low-pass components confirmed a unique flow structure, consisting of a high-velocity zone in the main channel and a low-velocity flow reversal within the lateral cavities. The band-pass components corresponded to the …

Go to article

Physical And Numerical Model Studies Of Hirakud Dam Additional Spillway –A Case Study, V. P. Gadhe, S. R. Patnaik Oct 2022

Physical And Numerical Model Studies Of Hirakud Dam Additional Spillway –A Case Study, V. P. Gadhe, S. R. Patnaik

International Symposium on Hydraulic Structures

Stilling basins are frequently used as energy dissipaters to protect the downstream hydraulic structures from scouring. The stilling basin uses the hydraulic jump as the hydraulic element for dissipating energy in a specific structure. A Stilling basin type of energy dissipator is mainly used for economic reasons; therefore, the Stilling Basin II type has been used on high and earth dam spillways and large canal structures. Basin II type design aims to reduce the hydraulic jump length by installing accessories, such as chute blocks and dentated sill in the stilling basin. Hirakud Dam is one of the multipurpose projects. In …

Go to article

Flow Over Orifice Spillway: Physical And Numerical Study For Spillway Profile Design Of Hydroelectric Project, Sushma Vyas, Y. N. Srivastava Oct 2022

Flow Over Orifice Spillway: Physical And Numerical Study For Spillway Profile Design Of Hydroelectric Project, Sushma Vyas, Y. N. Srivastava

International Symposium on Hydraulic Structures

Many high dams on the upper Himalayan rivers which have very steep bed slopes are constructed with orifice type of Spillways with low level sluices for flood disposal and flushing of sediments. To assess the performance of spillway physica  model studies were conducted on a 1:50 scale 2-D sectional model. Physical model studies can have a wide range of outcomes depending on the purposes of the model study, although many physical models frequently analyse properties such as velocity patterns, discharge rating curves, water surface profiles, and pressures. The physical measurements highlighted that the spillway is subjected to negative pressures. To …

Go to article

Jet Scour In Cohesive And Non-Cohesive Soil, J. Di Nardi, M. Palermo, S. Pagliara, F. A. Bombardelli Oct 2022

Jet Scour In Cohesive And Non-Cohesive Soil, J. Di Nardi, M. Palermo, S. Pagliara, F. A. Bombardelli

International Symposium on Hydraulic Structures

A safe design of hydraulic structures depends on reliable estimations of the scour generated by the interaction between flow, structure, and bed sediments. Non-cohesive and cohesive soils are characterized by very different scour processes. Consequently, the behavior of the two soil types under scour has usually been studied separately. More specifically, cohesive soils are subjected to significant interparticle forces, which affect the properties of the material, resulting in different erosion mechanisms. Because of the complexity of the problem, erosion processes have been mainly investigated experimentally, resulting in a variety of case-dependent predicting equations. Recent theoretical advancements contributed to clarify the …

Go to article

Scour Downstream Of A Broad Crested Drowned Weir, Rajat Chauhan, Rakesh Kumar Chaudhary, Zulfequar Ahmad Oct 2022

Scour Downstream Of A Broad Crested Drowned Weir, Rajat Chauhan, Rakesh Kumar Chaudhary, Zulfequar Ahmad

International Symposium on Hydraulic Structures

A detrimental problem of scour downstream of a Bagmari Syphon in the feeder canal off taking from Farakka Barrage on the Ganga River, West Bengal, India has kindled our interest in understanding the scour process downstream of a broad crested drowned weir. A river was syphoned across the Feeder canal at Bagmari, flushing the top of the syphon with canal bed. However, the canal bed degraded over the years and resulted in exposure and protrusion of the syphon barrel above the canal bed and acting as a broad crested drowned weir. Due to the acceleration of flow over the barrel, …

Go to article

Calculating Local Pier Scour In Coarse-Bed Streams, D. C. Froehlich Oct 2022

Calculating Local Pier Scour In Coarse-Bed Streams, D. C. Froehlich

International Symposium on Hydraulic Structures

Streams can be divided into two broad classes based on the predominant composition of the alluvial material in which they are formed: sand-bed and coarse-bed. Coarse-bed streams are formed primarily in gravel and larger sediments. They are common in mountain and foothill regions, mainly where igneous and metamorphic bedrock exists, and in areas of glacial-fluvial deposits. A feature that characterizes nearly all coarse-bed streams is a surface covered by large sediment particles compared to those forming the substratum –an armor layer. The presence of an armor layer has a considerable influence on the physical processes that scour material from around …

Go to article

Plunge Pool Rock Scour Assessment By Fluid-Solid Coupling, E. F. R. Bollaert, M. Grünzner Oct 2022

Plunge Pool Rock Scour Assessment By Fluid-Solid Coupling, E. F. R. Bollaert, M. Grünzner

International Symposium on Hydraulic Structures

This paper presents a novel approach for detailed 2D numerical assessment of rock scour in plunge pools or unlined channels downstream of hydraulic structures. The approach is based on an automated coupling between the 3D hydraulics and the turbulence of an impacting jet (or any other turbulent flow environment) and the detailed bathymetric evolution with time of the rocky bottom that is being scoured, for a given flood event. Detailed flow hydraulics are thereby computed by the FLOW-3D® CFD software, allowing sound implementation of air entrainment and defining the main flow parameters at the water-rock interface. Bathymetric evolution with time …

Go to article

Laws Of Turbulence And The Estimation Of Turbulent Kinetic Energy Budget For Flow Through A Degraded Channel-Bed, Mosedul Sarkar, Sankar Sarkar Oct 2022

Laws Of Turbulence And The Estimation Of Turbulent Kinetic Energy Budget For Flow Through A Degraded Channel-Bed, Mosedul Sarkar, Sankar Sarkar

International Symposium on Hydraulic Structures

This present study focuses on the laws of turbulence and estimation of the turbulent kinetic energy (TKE) budget for flow over a bimodal degraded bed under equilibrium conditions. The analyses of turbulence were performed based on the three-dimensional velocity data captured by using a Vectrino velocimeter. The streamwise velocity and Reynolds shear stress profiles show an excellent agreement with the existing literature. In view of the advancement in the direction of bed degradation, the measured velocity data captured at different streamwise locations (before, on and after the maximum equilibrium depth of degradation) were further processed to explore the scaling laws …

Go to article

Numerical Modelling Of Scour And Flow Field For Two Different Arrangements Of Piers Using Ssiim Model, Sushant Kumar Biswal, Animesh Das Oct 2022

Numerical Modelling Of Scour And Flow Field For Two Different Arrangements Of Piers Using Ssiim Model, Sushant Kumar Biswal, Animesh Das

International Symposium on Hydraulic Structures

In this work, a numerical model Sediment Simulation In Intakes with Multiblock option (SSIIM) is developed to analyse the effect of pier spacing on the scour process around side by side and staggered piers. Both �� − �� and �� − �� turbulence models are employed to solve the eddy viscosity flow equations and their performances are evaluated. From the initial observations it is concluded that, when the spacing between the piers is negligible, then both the piers behave like a single pier and the scour depth is found to be more than 42% than that of a single pier. …

Go to article

Scour Geometry And Dune Formation Characteristics Around Customized Structure In Channels, Rajib Das, Subhasish Das, Michele Palermo, Deep Roy, Simone Pagliara Oct 2022

Scour Geometry And Dune Formation Characteristics Around Customized Structure In Channels, Rajib Das, Subhasish Das, Michele Palermo, Deep Roy, Simone Pagliara

International Symposium on Hydraulic Structures

In this study, an attempt is made to verify the scour geometry and location of the dunes at a channel downstream where various structures are used as flow barriers. Various structures such as a square structure with a vane attached to one side, a rhombus and two similar structures positioning eccentrically, are used to examine scour geometry and dune formation. Overall, six Clearwater tests are performed, three of which are of single structures and three are a combination of two similar structures. All tests are performed keeping approach flow depth, discharge and bed material fixed. The main focus of the …

Go to article

First Prev Next Last