[HOT] What's water?
suzan at suzanreed.com
Mon May 4 04:07:49 UTC 2015
I mapped dry streams. Can someone experienced check my work yesterday? I
also saw waterways in areas where no water could run, as in forests or over
land without any waterway. I also questioned some paths could be wsterways.
Good to check Newbie work!
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On May 3, 2015 9:01:14 PM Prabhas Pokharel <prabhas.pokharel at gmail.com> wrote:
> On Mon, May 4, 2015 at 9:33 AM, Pat Tressel <ptressel at myuw.net> wrote:
> > ;-)
> > I'm seeing some rivers mapped in areas that didn't have high-res imagery,
> > that (in the DG imagery) cross over dry land, or through areas were tree
> > tops are visible against a dark background that could be either water or
> > shadow -- it's a dark gray-purple. What I'm interpreting as the actual
> > river channel is more turquoise and has (what look like) white rapids. The
> > imagery has no clouds, and land looks fairly dry, so this imagery may,
> > perhaps, be dry season.
> > Note the previously mapped rivers in this area are very rough -- points
> > are far apart -- which implies they were mapped from low-res imagery.
> > Some questions:
> > Is there a large change in water volume in rivers during the dry season?
> > I'm wondering if water recedes to the deepest channel, and does show more
> > whitewater then.
> Yes, changes in water volumes between wet and dry season can be immense in
> Nepal. Some stream beds may also go dry in the dry season.
> I would guess that some mountain streams may behave as you suggested, but
> generally, my expectation would be for more whitewater in the wet season.
> > Do trees grow in standing water (deep enough to appear dark) in Nepal?
> > That's not unheard of -- it's true in the Everglades in Florida. Or is an
> > area with treetops and dark between more likely dry but shadowed?
> Generally, most of the water in Nepal flows fast (we have lots of elevation
> changes), and there are very rarely trees growing in standing/moving water
> as in Florida.
> I don't understand your second question.
> > Thanks!
> > -- Pat
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> Prabhas Pokharel
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