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

Civil and Environmental Engineering Commons

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

18784 Full-Text Articles 20617 Authors 4846580 Downloads 118 Institutions

All Articles in Civil and Environmental Engineering

Faceted Search

18784 full-text articles. Page 1 of 401.

Pavements Analysis And Design, Yang Huang, Kamyar Mahboub 2016 University of Kentucky

Pavements Analysis And Design, Yang Huang, Kamyar Mahboub

Kamyar C. Mahboub

No abstract provided.


Cfd Study Of Decay Function Of Wall Shear Stress With Scour Around Complex-Shape Bridge Pier, Chen Li 2016 University of Nebraska

Cfd Study Of Decay Function Of Wall Shear Stress With Scour Around Complex-Shape Bridge Pier, Chen Li

Civil Engineering Theses, Dissertations, and Student Research

Pier scour problem is close related to the safety of bridges. The Federal Highway Administration of the United State also has a great interest in studying the relation between hydraulic loadings and scour depth. The current technological problem of directly measuring hydraulic loadings on a dynamic bed using physical experiments and the weak capacity to simulate the real scour processes with CFD methods inspired the development of a hybrid approach by combining them to study pier scour.

This research specifically focuses on the CFD part of the hybrid method. A series of three-dimensional (3-D) CFD models were developed with unsteady ...


The Role Of Physical And Numerical Modeling In Design Development Of The Priest Rapids Fish Bypass, T. C. Lyons, M. Politano, C. Dotson, L. J. Weber, D. Hay 2016 IIHR-Hydroscience & Engineering, University of Iowa

The Role Of Physical And Numerical Modeling In Design Development Of The Priest Rapids Fish Bypass, T. C. Lyons, M. Politano, C. Dotson, L. J. Weber, D. Hay

6ᵗʰ International Symposium on Hydraulic Structures

This paper describes a number of years of physical and numerical modelling that were instrumental in the development of the final fish bypass design at Priest Rapids Dam. Three physical models and multiple numerical models were used to guide the design of the fish bypass including its location on the dam, impact on forebay and tailrace flow patterns, intake configuration, design flow rates, flow control scheme, tailrace egress, potential for scour near the dam, potential impacts on total dissolved gas (TDG), impacts on spillway and powerhouse operation, and overall fish friendliness of the bypass.

Throughout those years of design work ...


South Channel Dam Rehabilitation Project - Successfully Addressing Dam Rehabilitation Challenges, M. D. Graeser, M. C. Jensen 2016 Alden Research Laboratory, Inc.

South Channel Dam Rehabilitation Project - Successfully Addressing Dam Rehabilitation Challenges, M. D. Graeser, M. C. Jensen

6ᵗʰ International Symposium on Hydraulic Structures

The Post Falls South Channel Dam is located on the Spokane River in Post Falls, Idaho. The concrete gravity dam was constructed in 1906 and was recently rehabilitated. The rehabilitation project included several design elements; the primary objectives were the replacement of the six spillway gates and hoists and significant rehabilitation of the concrete. The South Channel Dam rehabilitation encountered several challenges due to the age and condition of the existing structure, the large scale of the rehabilitation, and the location of the project. The concrete rehabilitation addressed several challenges which are presented in detail. The existing concrete consisted of ...


Technical Developments In Fish Exclusion, Guidance, And Collection Materials, A. L. Peters 2016 Pacific Netting Products

Technical Developments In Fish Exclusion, Guidance, And Collection Materials, A. L. Peters

6ᵗʰ International Symposium on Hydraulic Structures

Construction of mills, dams and other structures in rivers and streams, and the withdrawal of water for irrigation or cooling industrial facilities vital to social and economic progress, have impacted the survival of marine life. Barriers and guidance or collection nets can protect fish and aquatic species while allowing water to flow unimpeded for commercial and industrial use. However, nets can attract aquatic growth, fill with debris, degrade with environmental stress, and be expensive to operate and maintain.

A closer look at the technical developments of materials and net designs in diverse settings can offer guidance that will be of ...


Optimizing A New Flow Diversion Structure For The Planned Expanding Of The Spillway For The Malter Dam In Germany Using A Physical Hydraulic Model, J. Schmidt, J. Wieland, J. Jensen 2016 University of Siegen

Optimizing A New Flow Diversion Structure For The Planned Expanding Of The Spillway For The Malter Dam In Germany Using A Physical Hydraulic Model, J. Schmidt, J. Wieland, J. Jensen

6ᵗʰ International Symposium on Hydraulic Structures

The State Reservoir Administration of Saxony is planning to expand the spillway discharge capacity of the 102-year-old Malter Dam. After a catastrophic flood in 2002, updated hydrologic modeling indicated that the design discharges for the dam had increased significantly. As a result, the original spillway discharge capacity was insufficient to pass the revised design flows. A design concept was developed to add a second spillway and stilling basin to the dam, and to pass flow into this spillway using a novel vertical flow separator. The design and performance of this system was evaluated using a 1:25-scale physical model. The ...


Minimum Pressure Calculation Of Vortex For Stilling Basin With Step-Down Floor, Xia Quing-fu, Liu Zhi-ping, Guo Xin-lei 2016 China Institute of Water Resources and Hydropower Research

Minimum Pressure Calculation Of Vortex For Stilling Basin With Step-Down Floor, Xia Quing-Fu, Liu Zhi-Ping, Guo Xin-Lei

6ᵗʰ International Symposium on Hydraulic Structures

The horizontal vortex flow in the stilling basin with step-down floor is the special problem of hydraulics. In the horizontal vortex, the vortex flow streamline is assumed to be elliptical. According to the hydrodynamics of continuous and motion differential equations, the vortex pressure, vorticity, and other hydraulic characteristics are deduced in the vortex. The concept of velocity attenuation coefficient is proposed in this work, and a movement connection condition is established. The relationship between the minimum pressure of the vortex flow and the downstream water depth is studied, and a formula to calculate the minimum pressure is given. Compared with ...


Impacts Of Tailwater On The Design Of Several Stilling Basins In The Usa, L. E. Shearin-Feimster 2016 Schnabel Engineering

Impacts Of Tailwater On The Design Of Several Stilling Basins In The Usa, L. E. Shearin-Feimster

6ᵗʰ International Symposium on Hydraulic Structures

The dissipation of excess energy from flows exiting a spillway is often needed to prevent or reduce to acceptable levels conceivable negative impacts to the downstream channel, spillway, and dam (e.g., erosion, undermining). The optimization of a hydraulic jump type stilling basin using general purpose published design methodologies (i.e., USBR, SAF, etc.) for a project can be challenging, as these methodologies may not account for all site specific conditions and structure formulations by designers. Also, it is not often clear to a designer as to which flow rates (and corresponding flood events) will have the greatest influence on ...


Evaluation Of Spillway Stilling Basin Performance And Reservoir Sediment Flushing In A Physical Model Case Study: Due Hydroelectric Project In Ecuador, Ali Habibzadeh, Brian Hughes, Hernan Barahona 2016 Northwest Hydraulic Consultants Ltd.

Evaluation Of Spillway Stilling Basin Performance And Reservoir Sediment Flushing In A Physical Model Case Study: Due Hydroelectric Project In Ecuador, Ali Habibzadeh, Brian Hughes, Hernan Barahona

6ᵗʰ International Symposium on Hydraulic Structures

The Due Hydroelectric Project is a proposed 50 MW run-of-river hydroelectric project being developed by Hidroalto SA. The project will be located on the Rio Due in Ecuador. The civil works of the intake facility will be comprised of a 133.45 m wide diversion weir, with two overflow spillways and six gated sluice channels; a four bay intake structure with sediment excluder; and, a fish bypass facility. Northwest Hydraulic Consultants (NHC) evaluated the initial design of the Due intake and spillway facilities using a 1:35 Froude-scaled physical model for river discharges ranging from the intake design discharge of ...


St. Mary Diversion Dam – Case Study Of A 100 Year Old Diversion, B. J. Heiner, J. Wagner 2016 U.S. Bureau of Reclamation

St. Mary Diversion Dam – Case Study Of A 100 Year Old Diversion, B. J. Heiner, J. Wagner

6ᵗʰ International Symposium on Hydraulic Structures

After 100 years of service, the St. Mary Diversion Dam is being replaced with a new design that will provide more effective fish passage and protection. The diversion is located in northern Montana, adjacent to the east side of Glacier National Park. It diverts water from the St. Mary River 1.21 km (0.75 mile) downstream of Lower St. Mary Lake. The existing 60.35-meter-long and 1.83-meter-high (198-foot-long and 6-foot-high) concrete weir diverts up to 24 cubic meters per second (850 cubic feet per second) design flow from the St. Mary River into the North Fork of the ...


Study On Layout Pattern Of Filling And Emptying System In Datengxia Shiplock, Yingzhou Wu, Hui Chen, Yaozu Jiang, Min Fan 2016 Changjiang River Scientific Research Institute

Study On Layout Pattern Of Filling And Emptying System In Datengxia Shiplock, Yingzhou Wu, Hui Chen, Yaozu Jiang, Min Fan

6ᵗʰ International Symposium on Hydraulic Structures

Datengxia Shiplock is the super-high head single-lift shiplock with the largest chamber in the world. The single filling and emptying capacity of Datengxia Shiplock is much larger than that of Three Gorges Shiplock. Due to huge kinetic energy of flow during filling and emptying, there are significant problems in term of berthing conditions in the chamber and flow cavitation at valve section. Measured in the model with layout of filling and emptying system and valve operation mode similar to those of Three Gorges Shiplock, the mooring force in the chamber is higher than double of the permissible value specified. Given ...


Repair Of Failing Spirit Lake Outlet Tunnel At Mount St. Helens, J. P. Britton, S. K. Askelson, C. M. Budai, D. H. Scofield 2016 U.S. Army Corps of Engineers

Repair Of Failing Spirit Lake Outlet Tunnel At Mount St. Helens, J. P. Britton, S. K. Askelson, C. M. Budai, D. H. Scofield

6ᵗʰ International Symposium on Hydraulic Structures

The 18 May 1980 eruption of Mount St. Helens resulted in one of the largest debris avalanches recorded in history. The debris avalanche blocked the natural outlet of Spirit Lake. To prevent an uncontrolled and catastrophic lake break-out, the U.S. Army Corps of Engineers (USACE) constructed the Spirit Lake Outlet Tunnel from 1984 to 1985. Because Spirit Lake is located in the Mount St. Helens National Volcanic Monument, the project was transferred to the U.S. Forest Service (USFS) for ownership and management. During original tunnel construction, the most difficulty occurred within the 90-m-wide Julie and Kathy L. shear ...


Application Of The Optical Flow Method To Velocity Determination In Hydraulic Structure Models, D. B. Bung, Daniel Valero 2016 University of Applied Sciences FH Aachen

Application Of The Optical Flow Method To Velocity Determination In Hydraulic Structure Models, D. B. Bung, Daniel Valero

6ᵗʰ International Symposium on Hydraulic Structures

Optical flow estimation is used in Computer Vision for detection of moving obstacles in a sequence of images. The optical flow (OF) is defined as the displacement of brightness patterns between two sequent images. In this paper,this method is applied to high-speed images taken in hydraulic structure models for determination of velocity fields.Water is seeded with tracer particles in two cases and is self-aerated in a third case. It will be shown that the OF method gives valuable results which compare well to other velocity measurements, e.g. by Particle ImageVelocimetry. The OF method is generally more time-consuming ...


A Hydraulic Jump Stilling Basin With Six Legs Concrete Elements, Mahmood Shafai Bejestan, P Chahardahcherik 2016 Shahid Chamran University, Ahvaz, Iran

A Hydraulic Jump Stilling Basin With Six Legs Concrete Elements, Mahmood Shafai Bejestan, P Chahardahcherik

6ᵗʰ International Symposium on Hydraulic Structures

The hydraulic jump stilling basins are among the kinetic energy dissipater structures which are commonly designed downstream of gates, chutes and drop structures. The geometric dimensions of this structure depend mostly to the hydraulic jump characteristics as well as the quantities of the uplift pressure. In the present paper series of experimental tests have been conducted for a basin which its bed is covered with six-legs concrete(SLC) element tied together. The elements are placed on the top of alluvial bed to study the characteristics of the jump. Tests were performed for different flow conditions (Froude number ranged from 5 ...


Fish Passage Behavior Behavior Through Baffled And Nonbaffled Culvert, M. A. Khodier, Blake P. Tullis 2016 Utah State University

Fish Passage Behavior Behavior Through Baffled And Nonbaffled Culvert, M. A. Khodier, Blake P. Tullis

6ᵗʰ International Symposium on Hydraulic Structures

Culverts can have a negative impact on fish passage. Installing baffles inside culverts can potentially improve culvert fish passage by decreasing the flow velocity and increasing the flow depth. Fish passage behaviors of wild brown trout through a small prototype-scale (0.6 m diameter), 18.3 m in length, baffled, and non-baffled culverts were observed in the laboratory for a variety of discharges and pipe slopes (up to 6%). The baffle height and spacing was 0.15 and 0.9 times the culvert diameter, respectively. The correlation between successful fish passage, sample fish population, and the fish length was evaluated ...


Study On The Proceeding Of Hydraulic Problem Of Simulating Natural Fish Passage, Zhijuan Wang, Qingyuan Yang, Minghai Huang, Yong He 2016 Yangtze Rizer Scientific Research Institute

Study On The Proceeding Of Hydraulic Problem Of Simulating Natural Fish Passage, Zhijuan Wang, Qingyuan Yang, Minghai Huang, Yong He

6ᵗʰ International Symposium on Hydraulic Structures

Fish passage in water conservancy projects is an important means of improving river connectivity, and reducing the impact on the ecological environment. Simulating natural fish passage, which aims at the purpose of the river ecological corridor by the means of ecological optimization on the structure and section type based on the traditional fish passage, is promoted and applied in recent years gradually. At the same time, the hydraulic research related to the simulating natural fish passage has made great progress. In this paper, we firstly collected and summarized the research experience of the domestic and foreign typical fish passage, analyzed ...


Optimization Of Air Entrained Grout Enriched Roller Compacted Concrete For Improving Freeze-Thaw Resistance Of Hydraulic Structures, E. S. Musselman, R. J. Flynn, G. J. Zimmer, J. R. Young PE 2016 Villanova University

Optimization Of Air Entrained Grout Enriched Roller Compacted Concrete For Improving Freeze-Thaw Resistance Of Hydraulic Structures, E. S. Musselman, R. J. Flynn, G. J. Zimmer, J. R. Young Pe

6ᵗʰ International Symposium on Hydraulic Structures

Roller compacted concrete (RCC) is frequently used to construct gravity dams, stepped spillways, and to armor earthen embankments for passing extreme floods. Early experience on RCC dam applications in the 1980s showed a tendency for seepage to develop along the lift lines. Therefore, RCC dam designers started including an upstream facing system as a watertight barrier. An alternative facing material that has been used extensively overseas and is starting to gain more widespread acceptance in the United States is Grout Enriched RCC (GERCC). The grout enriched method of face construction has been shown to be less expensive than other facing ...


Evaluation Of Flexible Barrier And Sabo Dam To Control Effects Of Debris Flow In Santo Domingo Ravine, J. W. Cabrera Cabrera, L. F. Castillo Navarro 2016 Universidad Nacional de Ingenieria - Peru

Evaluation Of Flexible Barrier And Sabo Dam To Control Effects Of Debris Flow In Santo Domingo Ravine, J. W. Cabrera Cabrera, L. F. Castillo Navarro

6ᵗʰ International Symposium on Hydraulic Structures

Coast of Peru is characterized for the presence of ephemeral creeks which drain water only on wet season. The extremely dry soil and pebble combined with precipitation produce debris flow in a seasonal geodynamic. This is the case of Santo Domingo ravine which is located at eastern Lima, and drains their water to Rimac River. In this article the vulnerability of villages near to Santo Domingo ravine by debris flow and use of flexible barrier and sabo dams are analyzed. In a first stage, the liquid hydrograph to a 100 years return period was built and a solid hydrograph, a ...


Numerical Investigation Of Cavitation Characteristics Of Chamfered Offsets Into-The-Flow, R. Esmaili, S. A.A. Salehi Neyshabouri, A. R. Zarrati 2016 Utah State University

Numerical Investigation Of Cavitation Characteristics Of Chamfered Offsets Into-The-Flow, R. Esmaili, S. A.A. Salehi Neyshabouri, A. R. Zarrati

6ᵗʰ International Symposium on Hydraulic Structures

Cavitation is initiated when the localized pressure in the flow is reduced to the vapor pressure of the water. Surface irregularities are the main reason for reduction of pressure to vapor pressure when the flow velocity is sufficiently high. Cavitation potential also depends on the shape of the irregularity and the orientation of the irregularity compared to the direction of flow. Cavitation characteristics of chamfered offsets into-the-flow with two different slopes of 1:2 and 1:5 and two different heights of 5 mm and 12 mm are investigated numerically using the realizable k-ε turbulence model and volume of fluid ...


Physical Modeling Of An Aerating Stepped Spillway, S. Erpicum, M. Lodomez, J. Savatier, P. Archambeau, B. J. Dewals, M. Pirotton 2016 Liege University

Physical Modeling Of An Aerating Stepped Spillway, S. Erpicum, M. Lodomez, J. Savatier, P. Archambeau, B. J. Dewals, M. Pirotton

6ᵗʰ International Symposium on Hydraulic Structures

To mitigate the negative effects on the water quality in the downstream river of a projected large dam, and in particular to increase the dissolved oxygen concentration during low flow periods within the first 10 years of dam operation, an aerating weir has been designed and tested on a physical model at the Laboratory of Engineering Hydraulics (HECE) of the Liege University. The design of the structure has been done considering data from the literature. The selected solution is a 3 m high stepped spillway designed to operate in nappe flow conditions within the range of design discharges (25 – 100 ...


Digital Commons powered by bepress