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[[File:Death Valley Wash aerial.jpg|thumb|upright|[[Death Valley]] north of [[Stovepipe Wells]] has bajadas on both sides of the valley, more well developed on the [[Panamint Range]] side (far side in this aerial view from the northeast).]] |
[[File:Death Valley Wash aerial.jpg|thumb|upright|[[Death Valley]] north of [[Stovepipe Wells]] has bajadas on both sides of the valley, more well developed on the [[Panamint Range]] side (far side in this aerial view from the northeast).]] |
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A '''bajada''' consists of a series of coalescing [[alluvial fans]] along a mountain front. These fan-shaped deposits form by the deposition of sediment within a stream onto flat land at the base of a mountain.<ref name="agc.army"> |
A '''bajada''' consists of a series of coalescing [[alluvial fans]] along a mountain front. These fan-shaped deposits form by the deposition of sediment within a stream onto flat land at the base of a mountain.<ref name="agc.army">{{Cite web |title=Bajada {{!}} Deserts, Alluvial Fans, Floodplains {{!}} Britannica |url=https://www.britannica.com/science/bajada |url-status=live |archive-url=https://web.archive.org/web/20231202132028/https://www.britannica.com/science/bajada |archive-date=Dec 2, 2023 |access-date=2024-04-16 |website=www.britannica.com |language=en}}</ref> The usage of the term in landscape description or [[geomorphology]] derives from the [[Spanish language|Spanish]] word ''bajada'', generally having the sense of "descent" or "inclination".<ref>{{Cite book |url=http://archive.org/details/handyspanisheng00unkngoog |title=Handy Spanish-English and English-Spanish dictionary |date=1912 |publisher=New York, Philadelphia Hinds, Hayden & Eldredge, inc |others=University of Michigan}}</ref> |
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== Formation and occurrence == |
== Formation and occurrence == |
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[[File:Bajada - Izad Khast (Iran).jpg|thumb|Bajada in the desert of Iran]] |
[[File:Bajada - Izad Khast (Iran).jpg|thumb|Bajada in the desert of Iran]] |
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When a stream flows downhill, it picks up sediment along with other materials. As this stream emerges from a mountain front, the sediment carried begins to be deposited, such that coarser sediment is deposited closest to the base and the finer sediment grades outwards and deposits in a fan-shape away from the mountain face.<ref name="natgeo">National Geographic |
When a stream flows downhill, it picks up sediment along with other materials. As this stream emerges from a mountain front, the sediment carried begins to be deposited, such that coarser sediment is deposited closest to the base and the finer sediment grades outwards and deposits in a fan-shape away from the mountain face.<ref name="natgeo">{{Cite web |date=2015-06-26 |title=alluvial fan - National Geographic Education |url=https://web.archive.org/web/20150626143213/http://education.nationalgeographic.com/education/encyclopedia/alluvial-fan/?ar_a=1&ar_r=3 |access-date=2024-04-16 |website=web.archive.org}}</ref> The sediment is transported across a [[pediment (geology)|pediment]] into a closed basin where the bajadas grade back into a pediment, making the boundary difficult to distinguish. Bajadas frequently contain [[playa lakes]].<ref>Easterbrook, Don. Surface Processes and Landforms. Upper Saddle River: Prentice Hall, 1999. Print. P. 162. Accessed 9 October 2012.</ref> Bajadas are common in dry climates (e.g., the Southwestern US) where flash floods deposit sediment over time, although they are also common in wetter climates where streams are nearly continuously depositing sediment.<ref name="natgeo" /> |
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== References == |
== References == |
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Revision as of 00:00, 17 April 2024
A bajada consists of a series of coalescing alluvial fans along a mountain front. These fan-shaped deposits form by the deposition of sediment within a stream onto flat land at the base of a mountain.[1] The usage of the term in landscape description or geomorphology derives from the Spanish word bajada, generally having the sense of "descent" or "inclination".[2]
Formation and occurrence
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When a stream flows downhill, it picks up sediment along with other materials. As this stream emerges from a mountain front, the sediment carried begins to be deposited, such that coarser sediment is deposited closest to the base and the finer sediment grades outwards and deposits in a fan-shape away from the mountain face.[3] The sediment is transported across a pediment into a closed basin where the bajadas grade back into a pediment, making the boundary difficult to distinguish. Bajadas frequently contain playa lakes.[4] Bajadas are common in dry climates (e.g., the Southwestern US) where flash floods deposit sediment over time, although they are also common in wetter climates where streams are nearly continuously depositing sediment.[3]
References
- ^ "Bajada | Deserts, Alluvial Fans, Floodplains | Britannica". www.britannica.com. Archived from the original on Dec 2, 2023. Retrieved 2024-04-16.
- ^ Handy Spanish-English and English-Spanish dictionary. University of Michigan. New York, Philadelphia Hinds, Hayden & Eldredge, inc. 1912.
{{cite book}}: CS1 maint: others (link) - ^ a b "alluvial fan - National Geographic Education". web.archive.org. 2015-06-26. Retrieved 2024-04-16.
- ^ Easterbrook, Don. Surface Processes and Landforms. Upper Saddle River: Prentice Hall, 1999. Print. P. 162. Accessed 9 October 2012.
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