At first glance I could not breath for a while as spotted this strange thing -with shape of a torus- under the water surface. It looks as it were the spot where water drains under the bedrock, so thought, probably it can be a Cover-subsidence sinkhole (?) leading to some kind of an underground reservoir, but how sand-torus has been formed is still a mistery for me.
On image slide below you can see phases of the process:
# Phase1 - Drainage - The torus exists - overlay (ArcGIS/esri imagery 2011-2014) # Phase2 - Water has gone, bedrock partly visible (GE imagery 2014) # Phase3 - Desert sand returned (GE imagery 2018)
[slide];https://res.cloudinary.com/syzygy/image/upload/v1592983088/desert.sinkhole.phase1_b6qso8.jpg,Phase1 - Drainage - The torus exists - overlay (ArcGIS/esri imagery 2011-2014);https://res.cloudinary.com/syzygy/image/upload/v1592983089/desert.sinkhole.phase2_nsly02.jpg,Phase2 - Water has gone, bedrock partly visible (GE imagery 2014);https://res.cloudinary.com/syzygy/image/upload/v1592983088/desert.sinkhole.phase3_nmto1e.jpg,Phase3 - Desert sand returned (GE imagery 2018)[/slide]
Later, on the same day's afternoon when I have spotted it, a strange coincidence heated up my suspicion about this must be some kind of a drain-hole. Accidentally I have spilled some water on a dirty spot of the garden, and where water have found a quicker way to go underneath (an ants' tunnel or something), the torus shape has been formed in miniature:
Of course, maybe it has nothing to do with that desert feature, only interesting similarity could have grabbed my imagination...
So... any explanations on what is it and how it formed?
KitsuneFox: syzygy - posts I have made here do not receive much attention. I may do a detailed writeup of the now lost Edgemont Park in PA, one of the first electrified trolley parks in the world, but still debating. I'm missing 1 key bit of information.
Aug 17, 2021 10:38:20 GMT
syzygy: BRUTAL! Cars as if were matchboxes in a model town... Brilliant infos you share here in shoutbox - why not you post these?
Aug 16, 2021 17:36:00 GMT
KitsuneFox: In the early morning, before sunrise, of Augusts 11th, 12th, and 13th is reported to be the best viewing time for the Perseids meteor shower.
Aug 10, 2021 10:32:11 GMT
KitsuneFox: Davidson Seamount is the tallest known fully underwater mountain in the world, measuring 7,480 feet base to peak.
Aug 5, 2021 0:02:27 GMT
syzygy: ...and about other hills and humps... stone cold wisdom! ( :
Jul 28, 2021 14:13:17 GMT
KitsuneFox: Mount Wycheproof in Australia is the shortest recognized mountain on the world. It stands at 141 feet base to peak. A mineral named 'Wycheproofite' is mined near the location, and is the only known place it's found.
Jul 28, 2021 10:13:47 GMT
syzygy: Cool! Great extra info series about "all stars" highest mountains on Earth!
Jul 22, 2021 6:25:22 GMT
KitsuneFox: Mount Chimborazo in Ecuador is the highest mountain on Earth, as measured from the center of the planet. The peak is over 6,800 feet further away than Mount Everest, and is the closest land on earth to outer space.
Jul 22, 2021 0:13:35 GMT
SpiderX22: Big news in the Aircraft in Flight database (in Transportation) -> HUGE changes. Thanks RaveyThirteen for your post -> will be changing ownership of the collection (hopefully for me lol) -> look forward to this!
Jul 20, 2021 21:02:26 GMT