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Author : Vernon R. Bonner
Publisher : Unknown
Page : 26 pages
File Size : 48,5 Mb
Release : 1996
Category : Bridges
ISBN : UCR:31210024979765
Author : Gary W. Brunner
Publisher : Unknown
Page : 84 pages
File Size : 52,8 Mb
Release : 1995
Category : Bridges
ISBN : UCR:31210025038561
Author : A. David Parr
Publisher : Unknown
Page : 72 pages
File Size : 50,5 Mb
Release : 2007
Category : Bridges
ISBN : NWU:35556034506147
Most analyses of bridge hydraulics for flood flows are performed using the Army Corps of Engineers HEC-RAS (Hydrologic Engineering Centers River Analysis System) computer program. This study was carried out to compare results of HEC-RAS bridge modeling with experiments performed in a laboratory flume. The study was intended to add some insight into the effect of bridge hydraulic features such as ineffective flow regions, weir overflow and flow through skewed bridges. This insight should be useful for bridge engineers in HEC-RAS bridge modeling endeavors. A laboratory flume was constructed specifically for this project. The flume cross section has a main channel region and relatively wide left and right overbank regions. Different bridge scenarios were modeled. Froude number similarity was used to "scale up" model parameters and create prototype HEC-RAS hydraulic models simulating laboratory model conditions. Water surface profiles were compared for corresponding HEC-RAS and laboratory results.
Author : Transportation Association of Canada
Publisher : Thomas Telford
Page : 206 pages
File Size : 51,7 Mb
Release : 2004
Category : Computers
ISBN : 0727732625
Basic hydraulic considerations - Channel types and behaviour relation to bridges - Basic hydraulic requirements - Hydraulic design procedures Hydrologic estimates - Statistical frequency analysis - Runoff modeling - Empirical methods - High water levels and stage-discharge relations - Extreme floods and risk Scour protection and channel control - Scour protection around bridge foundations - Erosion protection of banks and slopes - Design of rock riprap - Cannel control works Hydraulic aspects of construction, inspection and maintenance - Construction - Inspection - Maintenance Special problems - Tidal crossings - Inland basic crossings - Waves and waves protection - Physical modeling of bridge problems - Alluvial fans - Debris flow and torrents
Author : John H. Hunt
Publisher : Unknown
Page : 88 pages
File Size : 43,8 Mb
Release : 1995
Category : Backwater
ISBN : UCR:31210025038579
Author : Peter Frederick Lagasse
Publisher : Transportation Research Board
Page : 177 pages
File Size : 52,8 Mb
Release : 2010
Category : Technology & Engineering
ISBN : 9780309118347
TRB's National Cooperative Highway Research Program (NCHRP) Report 653: Effects of Debris on Bridge Pier Scour explores guidelines to help estimate the quantity of accumulated, flow event debris, based on the density and type of woody vegetation and river bank condition upstream and analytical procedures to quantify the effects of resulting debris-induced scour on bridge piers. The debris photographic archive, the survey questionnaire and list of respondents, and the report on the field pilot study related to development of NCHRP 653 was published as NCHRP Web-Only Document 148: Debris Photographic Archive and Supplemental Materials for NCHRP Report 653.
Author : Gary W. Brunner
Publisher : Unknown
Page : 16 pages
File Size : 51,8 Mb
Release : 1994
Category : HEC-RAS (Computer program)
ISBN : UCR:31210024723205
Author : A. David Parr
Publisher : Unknown
Page : 188 pages
File Size : 50,6 Mb
Release : 2000
Category : DOS-WSPRO (Computer program)
ISBN : UIUC:30112104621757
The Kansas Department of Transportation (KDOT) and most bridge consultants in Kansas have been using the DOS-WSPRO program and the KDOT scour spreadsheets to perform bridge hydraulics and scour analysis for the past several years. Unfortunately, DOS-WSPRO is a DOS program that is no longer supported and there is no metric version. Consequently, the newer Windows-based hydraulics program HEC-RAS (Hydrologic Engineering Center River Analysis System) developed by the U.S. Army Corps of Engineers appears to be a logical choice to succeed DOS-WSPRO as the basic flow model in KDOT's bridge design and scour analysis program. HEC-RAS has gained considerable popularity in the engineering community and offers many options not previously available to hydraulic modelers. It also has a scour module and has an option, the WSPRO bridge analysis routine (henceforth called HR-WSPRO). This study compared the HEC-RAS program with the DOS-WSPRO program and examined the HEC-RAS program with regard to scour analysis. The possibility of using the existing KDOT scour spreadsheets with output from the HR-WSPRO bridge routine was also considered. Finally, a literature review was performed to determine if any updates in the scour methods and new approaches to special conditions, such as the effect of debris or pressure flow affecting pier scour, were available.
Author : Dennis Lyn,Sayan Dey,Siddharth Saksena,Venkatesh Merwade
Publisher : Unknown
Page : 128 pages
File Size : 47,9 Mb
Release : 2019-02
Category : Electronic
ISBN : 1622605063
Current INDOT policy requires that culvert-like structures with spans greater than 20 ft be treated for purposes of hydraulic analysis as a bridge, and hence mandates the use of software such as HEC-RAS for predicting the headwater, rather than the culvert-specific software, HY-8. In this context, culvert-like structures are assumed to have a standard inlet geometry (e.g., such as those already modeled in HY-8) and a constant barrel geometry. The present study examines the technical basis of this policy, and whether the policy could be revised to allow the application of simpler culvert-hydraulics analysis and HY-8 to culvert-like structures with spans greater than 20 ft. Laboratory experiments were performed with model box culverts of span 1.5 ft and two streamwise lengths, 2.1 ft and 8 ft, and performance curves describing the variation of headwater with discharge were obtained. The effects of bed roughness, the presence or absence of a cover (if present, the rise was 0.5 ft), and a range of tailwater levels, were investigated. The laboratory observations were compared with predictions by HY-8 and HEC-RAS models, and the model performance assessed. In general, HY-8 predictions were found to be as good as, and in some cases superior to, the HEC-RAS predictions, for both long and short culvert-like structures. This was attributed to the empirical information in HY-8 being more tailored to the specific standardized geometry of culvert-like structures, and the automatic inclusion of roughness effects, whereas HEC-RAS, at least when used with default coefficients and settings, relied on generic coefficients and neglected roughness effects. It was therefore recommended that a change in INDOT policy allowing large-span culvert-like structures to be analyzed using conventional culvert hydraulics would be technically justified for problems where the structure could be considered in isolation and accurate input data are available.
Author : J. Paul Guyer, P.E., R.A.
Publisher : Guyer Partners
Page : 30 pages
File Size : 54,5 Mb
Release : 2020-03-12
Category : Technology & Engineering
ISBN : 8210379456XXX
Introductory technical guidance for civil engineers and construction managers interested in hydraulic analysis for bridge design in flowing water, such as rivers. Here is what is discussed: 1. INTRODUCTION 2. HYDRAULIC MODELING CRITERIA AND SELECTION 3. SELECTING UPSTREAM AND DOWNSTREAM MODEL EXTENT 4 IDENTIFYING AND SELECTING MODEL BOUNDARY CONDITIONS.
Author : Anonim
Publisher : Unknown
Page : 658 pages
File Size : 41,8 Mb
Release : 2007
Category : Electronic
ISBN : NWU:35556036811677
Author : Donald W. Knight,Caroline Hazlewood,Rob Lamb,Paul G. Samuels,Koji Shiono
Publisher : CRC Press
Page : 606 pages
File Size : 48,5 Mb
Release : 2018-03-05
Category : Science
ISBN : 9781351654647
Practical Channel Hydraulics is a technical guide for estimating flood water levels in rivers using the innovative software known as the Conveyance and Afflux Estimation System (CES-AES). The stand alone software is freely available at HR Wallingford’s website www.river-conveyance.net. The conveyance engine has also been embedded within industry standard river modelling software such as InfoWorks RS and Flood Modeller Pro. This 2nd Edition has been greatly expanded through the addition of Chapters 6-8, which now supply the background to the Shiono and Knight Method (SKM), upon which the CES-AES is largely based. With the need to estimate river levels more accurately, computational methods are now frequently embedded in flood risk management procedures, as for example in ISO 18320 (‘Determination of the stage-discharge relationship’), in which both the SKM and CES feature. The CES-AES incorporates five main components: A Roughness Adviser, A Conveyance Generator, an Uncertainty Estimator, a Backwater Module and an Afflux Estimator. The SKM provides an alternative approach, solving the governing equation analytically or numerically using Excel, or with the short FORTRAN program provided. Special attention is paid to calculating the distributions of boundary shear stress distributions in channels of different shape, and to appropriate formulations for resistance and drag forces, including those on trees in floodplains. Worked examples are given for flows in a wide range of channel types (size, shape, cover, sinuosity), ranging from small scale laboratory flumes (Q = 2.0 1s-1) to European rivers (~2,000 m3s-1), and large-scale world rivers (> 23,000 m3s-1), a ~ 107 range in discharge. Sites from rivers in the UK, France, China, New Zealand and Ecuador are considered. Topics are introduced initially at a simplified level, and get progressively more complex in later chapters. This book is intended for post graduate level students and practising engineers or hydrologists engaged in flood risk management, as well as those who may simply just wish to learn more about modelling flows in rivers.
Author : Gary Dyhouse,Haestad Methods, Inc
Publisher : Unknown
Page : 752 pages
File Size : 54,6 Mb
Release : 2003
Category : CD-ROMs
ISBN : UOM:39015058862247
Introduction to floodplain modeling and management - Introduction to open channel hydraulics - Hydraulic modeling tools - Planning for floodplain modeling studies - Data needs, availability, and development - Bridge modeling - Culvert modeling - Data review, calibration, and results analysis - The U.S. national flood insurance program - Floodway modeling - Channel modification - Advanced floodplain modeling - Mobile boundary situations and bridge scour - Unsteady flow modeling - Importing and exporting files with HEC-RAS.
Author : Dr Les Hamill
Publisher : CRC Press
Page : 388 pages
File Size : 49,9 Mb
Release : 1998-12-03
Category : Technology & Engineering
ISBN : 0419205705
The design of bridges across rivers and streams is a major component of many civil engineering projects. The size of waterways must be kept reasonably small for reasons of economy and yet be large enough to allow floods to pass. Bridge Hydraulics is the first book to consider both arched and rectangular waterway openings in detail and to describe all of the main methods of analysis. With clear examples and relevant case studies, using both laboratory models and full- size bridges in the field, it is not only a thorough and accessible introduction to bridge hydraulics, but also a guide that will enable engineers to produce authoritative analyses and more effective designs.
Author : Anonim
Publisher : DIANE Publishing
Page : 44 pages
File Size : 48,8 Mb
Release : 2024-06-15
Category : Electronic
ISBN : 9781428984752
