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The Local Scouring Phenomenon At Bridge Abutments Terminating In The Floodplain Zone
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Book Synopsis The Local Scouring Phenomenon at Bridge Abutments Terminating in the Floodplain Zone by : Salah Kouchakzadeh
Download or read book The Local Scouring Phenomenon at Bridge Abutments Terminating in the Floodplain Zone written by Salah Kouchakzadeh and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examines the local scouring phenomenon associated with bridge abutments exposed to combined main-channel (MC) and floodplain (FP) flows. The principal goal of the study was to develop and validate, based on a comprehensive physical-model testing programme that considered different abutment shapes, an improved relationship for predicting maximum scour depth. A relationship was established among sediment size, flow depth and longitudinal channel slope for initiating the threshold condition of bed material movement. This relationship facilitated the selection of sediment size and channel bed slope for the various experiments, which were performed in a compound channel under interacting (combined MC and FP flows) and non-interacting (isolated FP flow) conditions. Clear-water approach-flow conditions were utilized throughout the testing programme. A flow visualization technique was employed to study the various patterns of the combining flows in the MC/FP junction regions. It determined both the flow deflection angle and the extent of the influence zone (a portion of the channel width beyond the abutment) whose discharge, $Q\sb{w}$, contributes to the scour development. Maximum scour depths produced under interacting conditions were observed to be 15% to 30% greater than those observed for non-interacting conditions. This important observation clearly demonstrated the need to properly account for compound-channel effects in the simulation exercise. The scour prediction relationship presented herein is based on a dimensional analysis of the relevant parameters and incorporates the data obtained from the laboratory studies performed in a compound channel using vertical-wall, wing-wall, semi-circular, and spill-through abutment shapes. The model indicates a very good agreement between predicted and observed maximum scour depths for bridge abutments terminating in the FP zone.
Book Synopsis Maximum Scour Depth at Bridge Abutments Terminating in the Floodplain Zone by :
Download or read book Maximum Scour Depth at Bridge Abutments Terminating in the Floodplain Zone written by and published by . This book was released on 1997 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most previous laboratory studies of local scour at bridge abutments were performed in rectangular channels in which the distributions of flow velocity and bed shear stress were considered uniform in the transverse direction. In reality, however, bridge abutments usually terminate in the flood plain zone of rivers where velocity and shear stress are not uniformly distributed. This paper presents the results of a laboratory study performed to investigate the impact of lateral momentum of flow intercepted by abutment and flow related to a specific channel width at the abutment end, is a significant parameter to account for lateral momentum transfer and should be incorporated in the scour prediction formulation. Also, based on the discharge ratio, Froude number, and critical Froude number associated with the sediment size, a relationship for predicting maximum local scour depth at bridge abutments was proposed.
Book Synopsis Stream Stability and Scour at Highway Bridges by : Everett V. Richardson
Download or read book Stream Stability and Scour at Highway Bridges written by Everett V. Richardson and published by ASCE Publications. This book was released on 1999-01-01 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sponsored by the Water Resources Engineering (Hydraulics) Divsion of ASCE. This collection contains 75 papers and 321 abstracts presented at conferences sponsored by the Water Resources Engineering (Hydraulics) Division of ASCE from 1991 through 1998. The collection contains many new and expanded versions of the original papers and is designed to assist the practitioner with the concepts in evaluating stream instability and scour at bridges. Topics include: history of bridge scour research; bridge scour determination; stream stability and geomorphology; construction scour; instrumentation for measuring and monitoring; field measurement; computer and physical modeling of bridge scour; scour at culverts; and economic and risk analysis. One important paper contains 384 field measurements of local scour at piers made by the U.S. Geological Survey.
Book Synopsis Effects of Debris on Bridge Pier Scour by : Peter Frederick Lagasse
Download or read book Effects of Debris on Bridge Pier Scour written by Peter Frederick Lagasse and published by Transportation Research Board. This book was released on 2010 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Method for Rapid Estimation of Scour at Highway Bridges Based on Limited Site Data by : Steven R. Holnbeck
Download or read book Method for Rapid Estimation of Scour at Highway Bridges Based on Limited Site Data written by Steven R. Holnbeck and published by . This book was released on 1997 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of the Phenomenon of Local Scour Around Bridge Piers by : Nangantani Davies Godfrey Mtundu
Download or read book Experimental Study of the Phenomenon of Local Scour Around Bridge Piers written by Nangantani Davies Godfrey Mtundu and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scour Around Bridge Piers and Abutments by : Emmett Morgan Laursen
Download or read book Scour Around Bridge Piers and Abutments written by Emmett Morgan Laursen and published by . This book was released on 1956 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Local Scour at Bridge Abutments by : Deepak Man Singh Dongol
Download or read book Local Scour at Bridge Abutments written by Deepak Man Singh Dongol and published by . This book was released on 1994 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1997 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stream Instability, Bridge Scour, and Countermeasures: A Field Guide for Bridge Inspectors by : Transportation Dept., Federal Highway Administration
Download or read book Stream Instability, Bridge Scour, and Countermeasures: A Field Guide for Bridge Inspectors written by Transportation Dept., Federal Highway Administration and published by Government Printing Office. This book was released on with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: FHWA Publication No. FHWA-NHI-08-0106. February 2009. Explains the behavior of rivers in order to recognize changing conditions associated with unstable streams or scour at bridge foundations that may threaten the stability of the bridge. Provides tips and guidance on what to look for with regard to both stream instability, including lateral instability, degradation, and aggradation, and scour at bridges, including contraction scour, pier scour, and abutment scour. Also covered are plans of action and countermeasures, such as monitoring, flood watches, bridge closures, and river training countermeasures.
Book Synopsis Local Scour Around Bridge Abutments Under Ice Covered Conditions by : Peng Wu
Download or read book Local Scour Around Bridge Abutments Under Ice Covered Conditions written by Peng Wu and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Local scour refers to the sediment transport around hydraulic structures by flowing water. Excessive scour around the abutment can potentially cause damage to the bridge, which may also result in catastrophic consequences. Abutment scour refers to the local scour generated by the flow passing around bridge abutments. One of the challenging problems for hydraulic engineers is the prediction of maximum scour depth around abutments and pier foundations so that proper provisions can be made in the design and construction to mitigate the consequences. Despite significant research efforts to improve the understanding of scour related problems, abutment scour is still among the more complex and challenging problems. Over the past few decades, local scour around bridge abutments has received wide attention, and many researchers have contributed various studies on the topic. The current state knowledge on local scour still has insufficiently understood aspects, for example, ice accumulation has never been addressed in the abutment scour research. The impacts of ice cover has never been conducted. To fill this gap, the present research is conducted. The ice cover can change the channel morphology and flow field. It is well known that river ice affects the vertical and lateral distribution of flow in a channel. Additionally, because river ice affects the flow conditions, it potentially influence sediment transport. Hence, the scour around abutments is affected. In the present research, a series of large flume experiments are conducted. By adding different simulated ice covers in the flume, ice-covered flow can be generated. By comparing the scour profiles and maximum scour depth around two commonly used abutments in three non-uniform sediments, the ice cover impacts have been investigated. A significant increase can be noticed by adding ice cover. With the increase in ice cover roughness, the maximum scour depth increase correspondingly. Meanwhile, semi-circular abutment can generate a relatively small scour hole. Further.
Book Synopsis Canadian Journal of Civil Engineering by :
Download or read book Canadian Journal of Civil Engineering written by and published by . This book was released on 1997 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental and Numerical Study of Local Scour Around Side-by-side Bridge Piers Under Ice-covered Conditions by : Mohammad Reza Namaee
Download or read book Experimental and Numerical Study of Local Scour Around Side-by-side Bridge Piers Under Ice-covered Conditions written by Mohammad Reza Namaee and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Local scour around piers and abutments is one of the main causes of the collapse of many bridges constructed inside rivers. Many researchers have conducted various studies to predict the maximum depth of a scour hole around bridge piers and abutments. However, most of them have been done in small-scale laboratory flumes and specifically for the open channel condition. Besides, most of the existing research on bridge piers uses uniform sediment which is not an appropriate representative of natural river systems. This can result in excessively conservative design values for scour in low risk or non-critical hydrologic conditions. The most severe cases of bridge pier scouring occur in cold regions when the surface of water turns into ice in which, an additional boundary layer is being added to the water surface, which leads to significant changes in the flow field and scour pattern around bridge piers. Ice cover also causes the maximum flow velocity to move closer to the channel bed.
Book Synopsis Localized Scour at Bridge Piers on Graded Particle Streambeds by : Howard D. Copp
Download or read book Localized Scour at Bridge Piers on Graded Particle Streambeds written by Howard D. Copp and published by . This book was released on 1991 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document reports on results of research to develop a method for estimating depth of local scour at bridge piers that would provide an improved estimate from current methodology, i.e., one (or more) based on sand bed streams.
Book Synopsis Evaluating Scour at Bridges by : E. V. Richardson
Download or read book Evaluating Scour at Bridges written by E. V. Richardson and published by . This book was released on 1991 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document, Hydraulic Engineering Circular No. 18 (HEC-18), contains the state-of-knowledge and practice for dealing with scour at highway bridges. The procedures for designing new, replacement and rehabilitated bridges to resist scour are presented. Procedures are presented for evaluating the scour vulnerability of existing bridges as well as inspecting bridges for scour. The use of countermeasures to protect bridges evaluated as failure prone due to scour is also presented. This document replaces the Federal Highway Administration (FHWA) publication "Interim Procedures for Evaluating Scour at Bridges," which was issued with FHWA Technical Advisory 5140.20, "Scour at Bridges," in September 1988.
Book Synopsis Experimental Study of the Phenomenon of Local Scour Around Bridge Piers by : Nangantani Davies Godfrey Mtundu
Download or read book Experimental Study of the Phenomenon of Local Scour Around Bridge Piers written by Nangantani Davies Godfrey Mtundu and published by . This book was released on 1980 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scour at Bridge Crossings by : Emmett Morgan Laursen
Download or read book Scour at Bridge Crossings written by Emmett Morgan Laursen and published by . This book was released on 1958 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
