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Saturday, August 1, 2020 | History

2 edition of Backwater effects of piers and abutments found in the catalog.

Backwater effects of piers and abutments

H. K. Liu

Backwater effects of piers and abutments

by H. K. Liu

  • 322 Want to read
  • 12 Currently reading

Published by Colorado State University] in [Fort Collins, Colo .
Written in English

    Subjects:
  • Hydraulics.

  • Edition Notes

    Statementby H.K. Liu, J.N. Bradley, E.J. Plate.
    ContributionsBradley, J. N., Plate, Erich J., Colorado State University., United States. Bureau of Public Roads.
    The Physical Object
    Paginationxxv, 364 p. :
    Number of Pages364
    ID Numbers
    Open LibraryOL14220148M

    Potential effects of large woody debris accumulations on backwater, hydrodynamic loads on structures, and local scour at bridge piers along a section of an urban stream containing three bridge crossings were modeled using the computer program FST2DH. abutments and piers, and the effect of scour on backwater. Previously and concurrently with this work, the Iowa State Highway Commission and the Bureau of Public Roads sponsored studies of scour at bridge piers (8) and scour at abutments (7) at the Iowa Institute of Hydraulic Research at Iowa City. In the State Highway De­File Size: 2MB.

    TABLE OF CONTENTS ~ COMMENTARY ON PRELIMINARY DESIGN OF BRIDGES. C3 Preliminary C General the loss of material around piers, abutments, spur dikes and embankments. There are two conditions for contraction and local scour: clear-water and live-bed. pile bents, “tee” piers) all have an effect on local scour. Closely spaced piles File Size: 2MB. The overall backwater coefficient K* consists of a base curve coefficient, K b, to which are added incremental coefficients to account for the effect of piers, eccentricity, and skew. The value of K* is primarily dependent on the degree of constriction of the flow .

    elevations or backwater, exacerbate scour at piers, abutments and other structures, and increase hydraulic forces acting on piers, bridge decks and floodplain structures. Local scour around bridge abutments including effects of relative bed coarseness and blockage ratio. Peng Wu, a Ram Balachandar b. a Environmental Systems Engineering, University of Regina, Regina, Canada. b Civil and Environmental Engineering, University of Windsor, Windsor, by: 2.


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Backwater effects of piers and abutments by H. K. Liu Download PDF EPUB FB2

Backwater effects of piers and abutments. Fort Collins, Colo.: Colorado State University, Civil Engineering Section, (OCoLC) Document Type: Book: All Authors / Contributors: Hsin-Kuan Liu; Joseph N Bradley; Erich J Plate; Colorado State University.

Civil Engineering Section.; United States. Bureau of Public Roads. groundwork for the study into the backwater effects caused by bridge abutments and piers.

Up until the mid ’s, the vast majority of research related to backwater effects had either been through mathematical methods or empirical methods (Liu et al, ). Liu et al () provides a detailed. Colorado State University and documented in the publication “Backwater Effects of Piers and Abutments” (Liu, Bradley, & Plate, ).

A two-dimensional (2D) modelling scheme will inherently model the energy losses associated with contraction and expansion, but the reliability of the representation of the losses is dependent on the. Prepared by the Civil Engineering Section, Colorado State University, Fort Collins, Colo.

in cooperation with the U.S. Dept. of Commerce, Bureau of Public by: 7. Simplified application of Rehbock's formula for the backwater effect caused by bridge piers =: Vereinfachte Anwendung der Rehbock'schen Army Engineer Waterways Experiment Station) [Reh, Uwe] on *FREE* shipping on qualifying offers.

Simplified application of Rehbock's formula for the backwater effect caused by bridge piers =: Vereinfachte Anwendung der Rehbock'schen Author: Uwe Reh.

that the backwater effects of bridge piers have been a concern for at least years. Subsequent studies were done in the early part of the 20th century. The results that are most widely used were published by Yarnell innamely where y = increase in water level Backwater effects of piers and abutments book by the piers, y = flow depth, K = coefficient depending y yFile Size: KB.

Bridge piers on river channels can cause obstacles for flood flow by reducing the cross-sectional area and inducing local eddy currents and high flow velocities, which may destroy hydraulic structures. A two-dimensional numerical model was used to investigate the effects of bridge piers on river flood hazards in the Jialing River, China.

For the modeling, Mike 21 FM was used, which is an Author: Wen Wang, Kaibo Zhou, Haixiao Jing, Juanli Zuo, Peng Li, Zhanbin Li. the watercourse. In this report, backwater effects caused by bridges are considered. Backwater Effects Bridges which cross a river in more than one span have piers located in the watercourse, which force water to flow around them.

The abutments of bridges also generally protrude into the a greater backwater effect was seen for the The backwater rise value decreases gradually for all nose shapes with the increasing of the scour hole volume around piers. This phenomenon occurs due to the increase in water depth with increasing the scour hole which causes low water velocities and small values of head losses.

Part (2): Effect of Contraction Ratio. Chapter 3: BRIDGES: Introduction. Flood damage to bridges are typically caused by water overtopping decks, erosion of the streambed under piers and abutment footings, erosion of the embankments, and impact and accumulation of floating debris on the decks, piers, and abutments.

Backwater eifects'of piers'and abutments, Colorado State University, Civil Engineering Section, Report CER57HKL10, pp. Naylor, A.H. A method for Calculating the Size of Stone Needed f o r Closing end tipped Rubble Ba'nks in Rivers, C I R I A, Rep London, 56pp Stephenson, D., These piers will obstruct the flow and may cause an increase in water levels upstream of the bridge structure.

The water level increase caused by the presence of bridge piers is called backwater. In this experimental research, the backwater effects caused by bridge piers were investigated in the laboratory for different pier sizes and for aFile Size: 1MB.

Theoretical background for the methods USBPR method. The backwater, which is the difference of depths at section 1 for the affected and the original flows, h 1 ∗, is found by applying the energy equation between sections 1 and 3 of Fig. 1: (1) h 1 + α 1 V 1 2 2 g = h 3 + α 3 V 3 2 2 g + K ∗ α 2 Vn 2 2 2 g where h 1 and h 3 are the depths; α 1 and α 3 are the velocity head Cited by: Civil Engineering Practical Notes A-Z Vincent T.

CHU 2 CONTENTS Preface 3 serves to provide waterproofing effect to the back faces of abutments. By reducing the seepage of water through the concrete, the amount of The head loss induced by the bridge piers causes the backwater effect so that the water level upstream is increased.

A new design chart is proposed yielding a quadratic equation for estimating words: bridge piers, backwater, flood control, compound-channel flow, skewed crossing. (i) Local scouring at the piers and bed erosion may take place.

To avoid the damage to the foundation of piers, some protective layers of stone or concrete apron could be provided around the piers. (ii) The head loss induced by the bridge piers causes the backwater effect so that the water level upstream is increased.

These regulations shall consider the definition of the flow actions, the accepted risk for the water level modifications and riverbed scours, the shapes of the piers and abutments, or other bank obstacles. INTRODUCTION. RIVERBED EVOLUTION.

BEHAVIOUR OF FLOW AROUND OBSTACLES. SCOUR FORECAST AND BACKWATER ANALYSIS. ACTIONS ON PIERS AND ABUTMENTS. Use of Backwater in Designing Bridge Waterways JOSEPH N. BRADLEY, Hydraulic Research Engineer, Bureau of Public Roads scour at bridge abutments, scour around piers, and methods for alleviating the width of the abutment or fill had no significant effect on the backwater.

Books. A-Z of books and conference proceedings; About our eBooks; ICE bookshop; Book series; Subjects. Guide to Bridge Hydraulics.

Next > Prev Guide to Bridge Hydraulics, Second Edition Flow Patterns and Backwater Effects. Scour. Fish Passage and Habitat. Floating Ice. Floating Debris (Drift). The deterioration of bridge substructure is a serious concern across the United States.

The pier encasement is one of the most common practices for repairing and strengthening the bridge substructure. It is a rehabilitation process of existing pile piers during the repair or replacement of the bridge superstructure, which involves enclosing part of an existing pile pier with a polyethylene or Author: Abhijit Sharma Subedi.

2. Bridges often present preexisting obstructions to flow such as piers, abutments, etc., that affect various aspects offlow and sediment dynamics including velocity, flow directions, and backwater effects.

3. Bridges are located at the intersection ofhighways and rivers often presenting the.Full text of "Design and Construction of Hydraulic Flume and Backwater Effects of Semi-Circular Constrictions in a Smooth Rectangular Channel: Progress Report No.

2" See other formats DESIGN AND CONSTRUCTION OF HYDRAULIC FLUME AND BACKWATER EFFECTS OF SEMI- CIRCULAR CONSTRICTIONS IN A SMOOTH RECTANGULAR CHANNEL Progress Report- Ho* 2 ID; K«B* .Lot of research has been carried out on backwater effects from channel obstructions and a few studies related specifically to bridge piers (Charbenean and Holley, ).

Sreelash and Mudgal () conducted an experimental work to establish the drag characteristics of cylindrical piers with different slot-collar combinations.