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Results of Repeat Bathymetric and Velocimetric Surveys at the Amelia Earhart Bridge on U.S. Highway 59 Over the Missouri River at Atchison, Kansas, 2009-2013.
| 题名： | Results of Repeat Bathymetric and Velocimetric Surveys at the Amelia Earhart Bridge on U.S. Highway 59 Over the Missouri River at Atchison, Kansas, 2009-2013. |
| 作者： | Huizinga, R. J. |
| 关键词： | Bridges; Channel Bed Elevations; Channels(waterways); Floods; Guidelines; Highway Bridges; Maps; Missouri River; Scour; Stability; Velocimeter Surveys |
| 摘要： | Bathymetric and velocimetric data were collected six times by the U.S. Geological Survey, in cooperation with the Kansas Department of Transportation, in the vicinity of Amelia Earhart Bridge on U.S. Highway 59 over the Missouri River at Atchison, Kansas. A multibeam echosounder mapping system and an acoustic Doppler current meter were used to obtain channel-bed elevations and depth-averaged velocities for a river reach approximately 2,300 feet long and extending across the active channel of the Missouri River. The bathymetric and velocimetric surveys provide a snapshot of the channel conditions at the time of each survey, and document changes to the channel-bed elevations and velocities during the course of construction of a new bridge for U.S. Highway 59 downstream from the Amelia Earhart Bridge. The baseline survey in June 2009 revealed substantial scour holes existed at the railroad bridge piers upstream from and at pier 10 of the Amelia Earhart Bridge, with mostly uniform flow and velocities throughout the study reach. After the construction of a trestle and cofferdam on the left (eastern) bank downstream from the Amelia Earhart Bridge, a survey on June 2, 2010, revealed scour holes with similar size and shape as the baseline for similar flow conditions, with slightly higher velocities and a more substantial contraction of flow near the bridges than the baseline. Subsequent surveys during flooding conditions in June 2010 and July 2011 revealed substantial scour near the bridges compared to the baseline survey caused by the contraction of flow; however, the larger flood in July 2011 resulted in less scour than in June 2010, partly because the removal of the cofferdam for pier 5 of the new bridge in March 2011 diminished the contraction near the bridges. Generally, the downstream part of the study reach exhibited varying amounts of scour in all of the surveys except the last when compared to the baseline. During the final survey, velocities throughout the study a |
| 报告类型： | 科技报告 |
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