| Abstract: | The development of scour holes in the Connecticut River near the new Baldwin Bridge has been documented by comparing geophysical records collected before (1989), during (1990), and after (1992) bridge construction. Eight piers that support the 570-m (meter) span over the Connecticut River were protected by 12-m wide cofferdams during construction. The maximum flow during the study was equivalent to a 3-year recurrence-interval flood, indicating no significant floods. Fathometer data indicate that deep scour holes, 1.5 to 6.4 m deep, developed north of piers 6, 7, and 8. Scour holes, less than 1.3 m-deep, developed south of these piers. The deepest scour hole was north of pier 7, where data show a flat river bottom in 1989, a scour 3.3-m deep in 1990, and a scour hole 6.4-m deep in 1992. Continuous seismic-profiling (CSP) data show that a 1.5 -m deep scour hole north of pier 6 in 1990 was filled in with 1.5-m of material by 1992. No infilling was detected in the scour holes north of piers 7 and 8. Numerous subbottom reflectors from geologic layers, up to 7.6 -m deep were identified in the CSP records. |
| Genre: | Conference Paper |
| ProdID: | 70017996 |
| Citation Author: | Placzek, Gary; Haeni, Peter, F.; Trent, Roy |
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| Citation Editor: | Shen Hsieh WenSu S.T.Wen Feng |
| Citation End Page: | 2056 |
| Citation Issue: | pt 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Proceedings - National Conference on Hydraulic Engineering |
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| Citation Number Of Pages: | 6 |
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| Citation Publisher: | Publ by ASCE |
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| Citation Search Results Text: | Using geophysical data to assess scour development; 1993; Conference Paper; Proceedings - National Conference on Hydraulic Engineering; Placzek, Gary; Haeni, Peter, F.; Trent, Roy |
| Citation Start Page: | 2051 |
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| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Using geophysical data to assess scour development; 1993; Conference Paper; Proceedings - National Conference on Hydraulic Engineering; Placzek, Gary; Haeni, Peter, F.; Trent, Roy |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1993 00:00 -0600 |
| Publisher: | Publ by ASCE |
