Timeline for What produces these distinct shapes in the Rub' al Khali seen from space?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Jun 17, 2018 at 10:37 | comment | added | user12525 | A great example what fractality is | |
| Dec 25, 2017 at 4:51 | vote | accept | uhoh | ||
| Dec 9, 2020 at 4:26 | |||||
| Jun 20, 2017 at 3:48 | comment | added | uhoh | I'm just thinking that adding an image of an example pointy structure (or at least a semi-permanent link) explaining that pointy structures are not uncommon would make the answer more complete and more interesting for future readers. It's always good to pull important points made in comments back into the answers themselves. To me it's important to leave the best possible learning experience for those who come and read here later. | |
| Jun 20, 2017 at 3:31 | comment | added | Knob Scratcher | No edit necessary; it's already in there! ......."Because dunes reorient only at their crest terminations with a change in wind regime, the rate of formation of a new pattern of small dunes is typically faster than the rate of reorientation of the existing pattern, resulting in the superposition of simple patterns to give rise to complex patterns. Complex patterns are distinct from spatial changes in a simple pattern, and from the type of superposition that characterizes compound/complex dunes." | |
| Jun 20, 2017 at 3:17 | comment | added | uhoh | OK, that's great! Do you think it's possible to add that back into the answer? I thought the points and steps were really unique. If they are not, then that information in the answer could wrap this question up nicely. | |
| Jun 20, 2017 at 3:15 | comment | added | Knob Scratcher | Pointy ends are a standard feature of many dunes (even on Mars!), particularly Barchan dunes: google.com/…. If you can imagine winds shifting to one direction for a prolongued period, then shifting back, you can easily imagine these pointy tails smeared and superposed in complex geometries. | |
| Jun 20, 2017 at 3:12 | comment | added | uhoh | I'll stop by the library in a few days and take a look at the papers. Thanks for the links! | |
| Jun 20, 2017 at 3:06 | comment | added | uhoh |
Ugh, anyone who's driven a car over a washboard road will cringe seeing that photo :) This is a great introduction to self-organization and periodicity. +1 However, I'm still interested if there has been any kind of possible explanation for, or discussions of the "stair steps" northward and sharp, pointy extensions southward. So I've asked Is there any understanding how such a distinct pattern could be formed? about the stair steps and pointy extensions.
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| Jun 20, 2017 at 2:53 | history | answered | Knob Scratcher | CC BY-SA 3.0 |