Download Free Stream Channel Migration Effects On Bridge Approaches And Conveyance Book in PDF and EPUB Free Download. You can read online Stream Channel Migration Effects On Bridge Approaches And Conveyance and write the review.

The main objective of this project is to investigate channel protection techniques, especially those with low-cost and low-maintenance, for control of channel migration near bridge approaches. Such low cost techniques are more applicable to small streams than to large rivers. A literature review was conducted. Channel migration is mitigated either through protection of the bank and/or bed erosion and considerable deposition, or through instream structures to redirect the flow, or both. Useful control techniques include: instream structures such as bendway weirs, riprap and masonry revetment, bioengineering techniques such as willow posts, and geosynthetic membranes. Advantages and disadvantages of these techniques are summarized. Based on the information obtained from a survey of Illinois bridge sites and under the guidance of the Technical Review Panel, four sites were selected for further study of applicability of the protection techniques. For every site it has been identified that the meander pattern of the stream is a major factor for the scour and flow action endangering bridge safety. Therefore, the general goals of the suggested alternative actions are to stabilize and/or improve the stream meander alignment and to control and protect against local bank scour. The alternatives for a site range from positive "active" control structures to "passive" protection and sediment deposition enhancement. Generally, the more "active" alternatives are more costly but have less failure risk when compared to the more "passive" alternatives.
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.