Difference between revisions of "Sapping"
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[[File:Canyonlands NP18.jpg|thumb|right|300px|The two canyons at center-left in this photo from Canyonlands National Park in Utah have the ''theater-shaped'' heads typical of valley features shaped by groundwater sapping.]] | [[File:Canyonlands NP18.jpg|thumb|right|300px|The two canyons at center-left in this photo from Canyonlands National Park in Utah have the ''theater-shaped'' heads typical of valley features shaped by groundwater sapping.]] | ||
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| + | [[File:Nirgal Vallis Close-up.JPG|thumb|left|300px|Probable valleys made by sapping Close-up of Nirgal Vallis, as seen by themis. Location is 27.6 S and 315.2 E. Image is 18.3 km wide.]] | ||
Many channels have been seen on Mars that look like ones created by groundwater sapping here on Earth.<ref>Gulick, V. 2001. Origin of the Valley Networks on Mars: a Hydrological Perspective. Geomorphology. volume = 37. issue = 3–4. 41–268</ref> <ref>Sharp, R. P., & Malin, M. C. 1975. Channels on Mars. Geological Society of America Bulletin. 86(5). 593–609.</ref> | Many channels have been seen on Mars that look like ones created by groundwater sapping here on Earth.<ref>Gulick, V. 2001. Origin of the Valley Networks on Mars: a Hydrological Perspective. Geomorphology. volume = 37. issue = 3–4. 41–268</ref> <ref>Sharp, R. P., & Malin, M. C. 1975. Channels on Mars. Geological Society of America Bulletin. 86(5). 593–609.</ref> | ||
Latest revision as of 09:44, 16 August 2021
Sapping is a type of erosion where the ground seems to have collapsed into wide valleys. Steep-sided U-shaped valleys of fairly uniform width with box-like, "theater-shaped" headwalls are characteristic of sapping. [1] Sapping is caused by water in the ground moving laterally until it eventually seeps out and creates its ampitheater-like shape. Valleys made by sapping occur throughout the world including in England, Colorado, Hawai’i, New Zealand, and other places. [2]
Many channels have been seen on Mars that look like ones created by groundwater sapping here on Earth.[3] [4]
See also
References
- ↑ Kocher, R. and J. Piper. 1986. Morphology of Large Valleys on Hawaii: Evidence for Groundwater Sapping and Comparisons with Martian Valleys. Journal of Geophysical Research. volume = 91. Issue = B13|pages = 175–192.
- ↑ Nash, D. 1996. GROUNDWATER SAPPING AND VALLEY DEVELOPMENT IN THE HACKNESS HILLS, NORTH YORKSHIRE, ENGLAND. Earth Surface Processes and LandformsVolume 21, Issue 9 p. 781-795
- ↑ Gulick, V. 2001. Origin of the Valley Networks on Mars: a Hydrological Perspective. Geomorphology. volume = 37. issue = 3–4. 41–268
- ↑ Sharp, R. P., & Malin, M. C. 1975. Channels on Mars. Geological Society of America Bulletin. 86(5). 593–609.
