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Evaluation of historical scour at selected stream crossings in Indian

By:
and
Edited by:
Shen Hsieh WenSu S.T.Wen Feng

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Abstract

Geophysical data were collected by means of ground-penetrating radar and tuned transducer systems to estimate the historical scour at ten bridges in Indiana. These geophysical data were used to compare and evaluate the results of 13 published pier-scour equations. In order to make this comparison, it was assumed that the measured historical scour was associated with the peak historical discharge. Because the geophysical data were not sufficient to map the lateral extent of the refilled scour hole, local scour could not be isolated from concentration scour. For the evaluation, computed contraction scour and pier scour were used in combination with the existing channel geometry to determine a computed bed elevation. This computed bed elevation was compared to be minimum historic bed elevation estimated from the geophysical data. None of the selected pier-scour equations, when combined with the contraction-scour equation, accurately represented the historical scour at all of the study sites. On the basis of the limited data presented, the equations currently recommended by the Federal Highway Administration provided a combination of accuracy and safety, required by design equations, equal to or better than the other equations evaluated.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Evaluation of historical scour at selected stream crossings in Indian
ISBN:
0872629201
Issue:
pt 2
Year Published:
1993
Language:
English
Publisher:
Publ by ASCE
Publisher location:
New York, NY, United States
Larger Work Title:
Proceedings - National Conference on Hydraulic Engineering
First page:
2231
Last page:
2236
Number of Pages:
6
Conference Title:
Proceedings of the National Conference on Hydraulic Engineering
Conference Location:
San Francisco, CA, USA
Conference Date:
25 July 1993 through 30 July 1993