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Book Estimates of Bridge Scour at Two Sites on the Virgin River Southeastern Nevada Using a Sediment transport Model and Historical Geomorphic Data

Download or read book Estimates of Bridge Scour at Two Sites on the Virgin River Southeastern Nevada Using a Sediment transport Model and Historical Geomorphic Data written by Marsha M. Hilmes and published by . This book was released on 1997 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Estimates of Bridge Scour at Two Sites on the Virgin River Southeastern Nevada Using a Sediment transport Model and Historical Geomorphic Data

Download or read book Estimates of Bridge Scour at Two Sites on the Virgin River Southeastern Nevada Using a Sediment transport Model and Historical Geomorphic Data written by Marsha M. Hilmes and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Water resources Investigations Report

Download or read book Water resources Investigations Report written by and published by . This book was released on 1997 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Publications of the Geological Survey

Download or read book Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1997 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book New Publications of the Geological Survey

Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1997 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book New Publications of the U S Geological Survey

Download or read book New Publications of the U S Geological Survey written by and published by . This book was released on 1997 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Scour at Bridge Sites in Delaware Maryland and Virginia

Download or read book Scour at Bridge Sites in Delaware Maryland and Virginia written by Donald C. Hayes and published by . This book was released on 1996 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Bridge scour Analysis on Cuchillo Negro Creek at the Interstate 25 Crossing Near Truth Or Consequences New Mexico

Download or read book Bridge scour Analysis on Cuchillo Negro Creek at the Interstate 25 Crossing Near Truth Or Consequences New Mexico written by Scott D. Waltemeyer and published by . This book was released on 1995 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Method for Rapid Estimation of Scour at Highway Bridges Based on Limited Site Data

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 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Scour at Contracted Bridges

Download or read book Scour at Contracted Bridges written by and published by . This book was released on 2006 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of NCHRP Project 24-14 was to collect field data from which processes affecting scour magnitude in contracted bridge openings could be identified, to support verification of physical and numerical model studies, and to improve guidelines for applying scour-prediction methods at contracted bridge sites. The objectives were accomplished by the collection and analysis of data at 15 bridge sites. A combination of real-time and post-flood data collection activities provided comprehensive field data sets. Detailed directional velocity data were collected throughout the reaches affected by the bridge where flood and site conditions permitted (4 of 15 sites). In addition, streambed, stream bank and floodplain material properties were described. Raw data were reduced and assembled into a database accessible through the World Wide Web (http://ky.water.usgs.gov/Bridge%5fScour/BSDMS/index.htm). Scour predictions based on the methods provided in HEC-18 were compared to the observed scour at each site. Flow velocity and depth data obtained from real-time investigations along with post-flood topographic surveys were used to develop and calibrate two-dimensional hydraulic models (RMA-2 and FESWMS) at two sites. One-dimensional hydraulic models (HEC-RAS or WSPRO) were developed for all sites where sufficient cross sectional data were collected or available. The velocities obtained from numerical simulations were compared to measured velocities. The observations and measured data demonstrate the inaccuracies of the current scour prediction methods as specified in HEC-18 related to contraction scour and abutment and the effectiveness of the Melville and Dongol method for predicting scour at a pier with debris. Measured flow-velocity distributions and those computed from the one-dimensional and two-dimensional models were compared. Scour topography computed with the two-dimensional hydraulic model and two-dimensional sediment transport model were compared. Recommendations for future research that will advance scour-prediction methods were provided including suggested modifications to the Strategic Plan for Scour Research (NCHRP Project 24-8). Appendix A, 10 case studies, is provided.

Book Pilot Study Collection of Bridge scour Data

Download or read book Pilot Study Collection of Bridge scour Data written by Robert D. Jarrett and published by . This book was released on 1987 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Field Observations and Evaluations of Streambed Scour at Bridges

Download or read book Field Observations and Evaluations of Streambed Scour at Bridges written by U. S. Department Of Transportation and published by CreateSpace. This book was released on 2015-03-12 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge piers and highway embankments leading to a bridge often obstruct the flow of floodwaters, causing an increase in velocity and the development of vortices. The increased velocity and vortices often cause scour near the bridge foundations. The damage to and failure of bridges caused by scour are problems of national concern. This report describes the results of the second USGS national field-data collection and analysis study on scour at bridges, funded by FHWA. The database originally developed during the first national study has been enhanced and many scour measurements added, including measurements of abutment and contraction scour. Sufficient local pier scour data are now available to permit a detailed analysis of local pier scour. Scour depths computed from published pier scour equations are compared to the field measurements. Many commonly cited dimensionless variables believed to control the depth of scour are evaluated and compared with equations developed from laboratory data. The effect of the size and gradation of the bed material on the depth of scour is investigated, and a correction factor for the HEC-18 pier scour equation is proposed. Available data are insufficient to permit a detailed investigation of contraction and abutment scour; however, some basic comparisons and qualitative observations are presented on the basis of a review of the literature. The results of scour analyses for two contracted bridges are compared with real-time field data.