| Abstract: | Scour data were collected during 1936-94 at 22 bridge sites in Mississippi. The drainage area of the bridge-scour sites ranged from 60.8 to 5,720 square miles, and the slope in the vicinity of each site ranged from 0.00011 to 0.00163 foot per foot. Measured pier-scour depths ranged from 0.6 to 20.4 feet. Measured total-scour depths at minimum-bed elevation ranged from 5.2 to 29.8 feet. Recurrence intervals of measured streamflow discharges ranged from less than 2 years to about 500 years. All of the Mississippi pier-scour depths were within 2.3 times the normal pier width, which agreed with previous research. Only 12 (6 percent) of the 190 measured pier-scour depths were greater than 1.1 times the normal pier width. Measured pier-scour depths were as much as 2.24 times a normal pier width of 3.3 feet. However, for pier widths greater than about 4 feet, measured pier-scour depths were significantly less than 2.3 times the normal pier width. An envelope-curve equation for the Mississippi pier-scour data was developed by relating pier-scour depth divided by normal pier width to measured approach-flow depth divided by normal pier width. The envelope-curve equation predictions could be used for reasonable verifi- cations of the HEC-18 pier-scour predictions, currently required for the design and mainte- nance of bridges over waterways in Mississippi. |
| Genre: | USGS Numbered Series |
| ProdID: | 30538 |
| Citation Author: | Wilson, K. V., Jr. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iv, 44 p. :ill., map ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
Earth Science Information Center, Open-File Reports Section [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 94-4241 |
| Citation Search Results Text: | Scour at selected bridge sites in Mississippi; 1995; WRI; 94-4241; Wilson, K. V., Jr. |
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| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Scour at selected bridge sites in Mississippi; 1995; WRI; 94-4241; Wilson, K. V., Jr. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1994/4241/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1994/4241/report.pdf |
| Date Other: | Fri, 1 Sep 1995 00:00 -0500 |
| Publisher: | U.S. Geological Survey ;
Earth Science Information Center, Open-File Reports Section [distributor], |
