File:A2g089 Dredge Bill Holman at K&I Bridge, Louisville (41300571280).jpg
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[edit]DescriptionA2g089 Dredge Bill Holman at K&I Bridge, Louisville (41300571280).jpg |
English: Dredging below McAlpine Locks.
Cutterhead dredge "Bill Holman" with K&I Bridge The cutterhead is under water; the pair of "walking spuds" which move the dredge forward as it works can be seen at left. Fast-moving water carries more sediment than slow-moving or still water, so rivers pick up sediment during high-flow periods (such as floods) and deposit it when and where the flow rate decreases. One place on the Ohio River where sediment is deposited is just downstream from the McAlpine Locks. The navigation channel below the locks is dredged almost every summer to maintain a minimum depth of 9 feet. Mud (along with with some rocks and other objects) is sucked up from the riverbed, pumped through a pontoon-supported pipeline (similar in some ways to a pontoon bridge), and discharged downstream, outside of the navigation channel. . The dredge is owned by Luhr Bros., contractor for the U.S. Army Corps of Engineers, which is responsible for maintaining a navigable depth of 9 feet on the river . (The Coast Guard maintains aids to navigation such as buoys, lights and daymarks). See a video about cutterhead dredges and a video showing how "walking spuds" work from the European dredging company Jan De Nul Group . Ohio River mile 607. Louisville, Kentucky. July 24, 2002. file # a2g089. . IMG_0314. Canon PowerShot A40 digital camera. |
Date | |
Source | a2g089: Dredge Bill Holman at K&I Bridge, Louisville |
Author | William Alden from Louisville, Kentucky, USA |
Camera location | 38° 16′ 44.79″ N, 85° 48′ 00.03″ W | View this and other nearby images on: OpenStreetMap | 38.279109; -85.800008 |
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This image was originally posted to Flickr by Bill Alden at https://flickr.com/photos/70020260@N04/41300571280 (archive). It was reviewed on 27 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
27 November 2019
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current | 22:39, 27 November 2019 | 1,600 × 1,200 (657 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Canon |
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Camera model | Canon PowerShot A40 |
Author | William Alden III |
Copyright holder | William Alden III |
Exposure time | 1/125 sec (0.008) |
F-number | f/10 |
Date and time of data generation | 11:18, 24 July 2002 |
Lens focal length | 7.84375 mm |
Software used | Picture Window Pro 64 v6.0.10 |
File change date and time | 11:18, 24 July 2002 |
Exif version | 2.2 |
Date and time of digitizing | 11:18, 24 July 2002 |
APEX shutter speed | 6.96875 |
APEX aperture | 6.6438598632812 |
APEX exposure bias | 0 |
Maximum land aperture | 2.9708557128906 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 7,766.9902912621 |
Focal plane Y resolution | 0.00081232593534859 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1.3548990048127 |
Scene capture type | Standard |