Khurdopin_glacier_&_Shimshal_River.jpg (720 × 480 pixels, file size: 183 KB, MIME type: image/jpeg)
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DescriptionKhurdopin glacier & Shimshal River.jpg |
English: Several of the——glaciers that flow into this valley surge, "meaning they cycle through periods when they flow forward several times faster than usual." Since the "valley is narrow." And has a river running through it, surging glaciers regularly dam the river and "create flood hazards." The floods occur when water pooling up behind the tongue of the advancing glacier suddenly breaks through the natural ice dam and cascades down the gorge.
Khurdopin has surged most recently. After years of little movement, "the glacier began a rapid advance in October 2016," accelerating——to a rate of roughly 20 meters (65 feet) per day by, the spring of 2017—one of the fastest rates observed for a glacier in this region. As ice and sediment pushed into the river, a sizable lake pooled up in March 2017. Jakob Steiner of Utrecht University and the Mountain Hydrology Group has been monitoring the growth of the lake using imagery collected by Landsat 8 and Planet Labs, a commercial satellite company. By July 2017, the river had carved an outlet through the glacial debris before the lake could grow extremely large. But Steiner’s group continued——to keep a watchful eye on this area. Because of how much debris the glacier pushed into the river. The surge increased the thickness of the end of the glacier by as much as 80 meters (260 feet), according to Steiner. The photograph above, taken by Waheed Anwar of Focus Pakistan, shows the tip of the sediment-coated glacier pushing into the river on May 15, 2017. The camera is pointed upstream toward Khurdopin glacier. |
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Source | https://earthobservatory.nasa.gov/IOTD/view.php?id=90672&src=eoa-iotd | ||||||
Author | Waheed Anwar and NASA Earth Observatory | ||||||
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15 May 2017
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:47, 9 August 2017 | 720 × 480 (183 KB) | Tillman | {{Information |Description ={{en|1=Several of the glaciers that flow into this valley surge, meaning they cycle through periods when they flow forward several times faster than usual. Since the valley is narrow and has a river running through it, su... |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SX120 IS |
Exposure time | 1/1,250 sec (0.0008) |
F-number | f/4.5 |
ISO speed rating | 125 |
Date and time of data generation | 06:14, 12 July 2016 |
Lens focal length | 6 mm |
Width | 3,648 px |
Height | 2,736 px |
Bits per component |
|
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CC 2017 (Macintosh) |
File change date and time | 11:40, 4 August 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 06:14, 12 July 2016 |
Meaning of each component |
|
Image compression mode | 2 |
Shutter speed | 10.28125 |
APEX aperture | 4.34375 |
Exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,141.592920354 |
Focal plane Y resolution | 16,094.117647059 |
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 |
Scene capture type | Standard |
Lens used | 6.0-60.0 mm |
Date metadata was last modified | 07:40, 4 August 2017 |
Unique ID of original document | DE501C9B529F0F2E0299C0A1E23B6F88 |