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B-Roll w/narration - Thermokarst-cave ice is formed through thermal erosion, where surface water vertically migrates downward into the ground and along the ice wedge. Then the surface water can flow laterally along the ice wedge, eroding underground conduits for water flow. The conduit of water can eventually refreeze and form thermokarst-cave ice. The ice is similar to lake and river ice with occurrence of columnar ice, however these columns point inward toward the center of the conduit, instead of downward like lake and river ice, due to the freezing front coming from all sides. Commonly surrounding the thermokarst-cave ice is reticulate-chaotic cryostructure, where saturated sediments that are often emplaced by the intruded water refreeze in a unique pattern. Interestingly, ice veins will cross-cut some of the thermokarst-cave ice and reticulate-chaotic cryostructure as the ice wedges continue to grow after the thermal erosion event.
| Date Taken: | 11.02.2017 |
| Date Posted: | 02.14.2018 08:37 |
| Category: | B-Roll |
| Video ID: | 584567 |
| VIRIN: | 171002-A-ND890-001 |
| Filename: | DOD_105315383 |
| Length: | 00:00:48 |
| Location: | FOX, ALASKA, US |
| Downloads: | 11 |
| High-Res. Downloads: | 11 |
This work, Thermokarst-cave ice - Permafrost Tunnel Research Facility, by David Gray, identified by DVIDS, must comply with the restrictions shown on https://www.dvidshub.net/about/copyright.
