File:Medano Creek Wave (52769379221).jpg
![File:Medano Creek Wave (52769379221).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Medano_Creek_Wave_%2852769379221%29.jpg/800px-Medano_Creek_Wave_%2852769379221%29.jpg?20230330163743)
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Summary
[edit]DescriptionMedano Creek Wave (52769379221).jpg |
Medano Creek and Sand Creek exhibit a globally rare phenomenon call surge flow, a stream flowing in rhythmic waves on sand. Three elements are needed to produce waves: a relatively steep gradient to give the stream a high velocity; a smooth, mobile creekbed with little resistance; and sufficient water to create surges. In late spring, these elements combine to make waves at Great Sand Dunes. As water flows across sand, sand dams or antidunes form on the creekbed, gathering water. When the water pressure is too great, the dams break, sending down a wave about every 20 seconds. In wet years, waves can surge over 15 inches (38 cm) high! NPS/Patrick Myers |
Date | |
Source | Medano Creek Wave |
Author | Great Sand Dunes National Park and Preserve |
Licensing
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This image was originally posted to Flickr by Great Sand Dunes National Park and Preserve at https://flickr.com/photos/94707653@N06/52769379221. It was reviewed on 30 March 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark. |
30 March 2023
Public domainPublic domainfalsefalse |
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This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information. | ![]() |
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current | 16:37, 30 March 2023 | ![]() | 6,000 × 4,000 (17.78 MB) | Юрий Д.К. (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D7100 |
Exposure time | 1/1,000 sec (0.001) |
F-number | f/9 |
ISO speed rating | 400 |
Date and time of data generation | 13:20, 10 June 2019 |
Lens focal length | 70 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop 24.3 (Windows) |
File change date and time | 21:43, 24 March 2023 |
Y and C positioning | Centered |
Exposure Program | Shutter priority |
Exif version | 2.21 |
Date and time of digitizing | 13:20, 10 June 2019 |
Meaning of each component |
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APEX aperture | 6.3398500267809 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Light source | Cloudy weather |
DateTime subseconds | 00 |
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Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 105 mm |
Scene capture type | Standard |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Lens used | TAMRON SP 70-300mm F4-5.6 Di VC USD A005N |
Serial number of camera | 2658815 |
Flash | Flash did not fire, compulsory flash suppression |
Image width | 6,000 px |
Image height | 4,000 px |
Bits per component |
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Compression scheme | Uncompressed |
Height | 4,000 px |
Width | 6,000 px |
Pixel composition | RGB |
Number of components | 3 |
Date metadata was last modified | 15:43, 24 March 2023 |
Rating (out of 5) | 0 |
Unique ID of original document | 803F918A60A5639C1DB4FF05028543B1 |