by JohnD » Sun Apr 22, 2012 2:30 pm
Interesting simulation here:
http://www.youtube.com/watch?v=tsNGcjPP0Zg
Takes some time to form any actual barchans, but eventually they are there, complete with 'drips' from the horns.
This is more diagrammatic, but shows how small dunes can "pass through" larger.
http://www.youtube.com/watch?v=Q_7VtpYQ ... re=related
Here's a water sluice simulation that shows very clearly the development of the slip face, in differently dark strata.
http://www.youtube.com/watch?v=cJo0fTpJ ... re=related
There seem to be no time lapse videos of real dunes at all !
Here is a short field trip tutorial on sand dunes.
Your tutor (I don't know him) is speaking exclusively about terrestrial dunes, but I suspect that much of what he says, including the ancient lake bed, will be true on Mars.
http://www.youtube.com/watch?v=sQ9mwsPv ... re=related
But some fun.
This shows how running water forms ever changing ripples, as in the sluice:
http://www.youtube.com/watch?v=l76v0kJ8 ... re=related
Scale that up - and its surf time!
http://www.youtube.com/watch?v=lImQH0RD ... re=related
John
Interesting simulation here:
http://www.youtube.com/watch?v=tsNGcjPP0Zg
Takes some time to form any actual barchans, but eventually they are there, complete with 'drips' from the horns.
This is more diagrammatic, but shows how small dunes can "pass through" larger.
http://www.youtube.com/watch?v=Q_7VtpYQFVI&feature=related
Here's a water sluice simulation that shows very clearly the development of the slip face, in differently dark strata.
http://www.youtube.com/watch?v=cJo0fTpJypg&feature=related
There seem to be no time lapse videos of real dunes at all !
Here is a short field trip tutorial on sand dunes.
Your tutor (I don't know him) is speaking exclusively about terrestrial dunes, but I suspect that much of what he says, including the ancient lake bed, will be true on Mars.
http://www.youtube.com/watch?v=sQ9mwsPvElE&feature=related
But some fun.
This shows how running water forms ever changing ripples, as in the sluice:
http://www.youtube.com/watch?v=l76v0kJ8rgo&feature=related
Scale that up - and its surf time!
http://www.youtube.com/watch?v=lImQH0RD0NU&feature=related
John