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Author Topic: River ice and Discharge  (Read 5574 times)

Aluminium

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Re: River ice and Discharge
« Reply #50 on: May 25, 2020, 11:01:05 AM »
I did not find way but saved one graph in 2019.

Another source shows graphs for 2017-2020, 13-years average, min and max.

+10 metres in one day. It sounds dangerous.

gerontocrat

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Re: River ice and Discharge
« Reply #51 on: May 25, 2020, 02:11:49 PM »
I did not find way but saved one graph in 2019.

Another source shows graphs for 2017-2020, 13-years average, min and max.

+10 metres in one day. It sounds dangerous.
And is normal!

That site (e.g. https://allrivers.info/gauge/lena-gms-dzhardzhan )  is magic. I access using google. Google asks me if I want to translate. I click English, then on each page I access after a few seconds the english arrives.

Just had a quick look, but could get lost in it for hours. e.g. first iage.

And attached is some graphed flow data from an old science paper (2006)
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paolo

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Re: River ice and Discharge
« Reply #52 on: May 25, 2020, 02:41:14 PM »
Gerontocrat,
No translation, but clicking around...
It seems to me that this year is exceptional, below the picture with the years 2016, 2017, 2018, 2019 and 2020 ...

paolo

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Re: River ice and Discharge
« Reply #53 on: May 27, 2020, 09:38:24 AM »
update

grixm

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Re: River ice and Discharge
« Reply #54 on: May 27, 2020, 12:23:57 PM »
The ice in the Gulf of Ob seems to have shattered, meaning that essentially the Ob river is free flowing all the way to the arctic ocean.
« Last Edit: May 27, 2020, 12:36:34 PM by grixm »

Aluminium

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Re: River ice and Discharge
« Reply #55 on: May 27, 2020, 01:13:48 PM »
allrivers.info shows current water temperature sometimes. For example, a station in the Lena delta got 0.2°C. 1.5°C was in Karaul (north of Dudinka). 2.0°C was in Chersky (on the Kolyma River).

blumenkraft

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Re: River ice and Discharge
« Reply #56 on: May 28, 2020, 09:17:31 PM »
Lena Delta

Jim Hunt

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Re: River ice and Discharge
« Reply #57 on: May 29, 2020, 11:06:32 AM »
Lena Delta

How did it manage that?

I've waiting for the clouds to clear on WorldView for days without any luck :(
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blumenkraft

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Re: River ice and Discharge
« Reply #58 on: May 29, 2020, 12:40:37 PM »
Well, since Sentinel 2 is so damn hi-res, even a small hole in the clouds can give you a good peek, Jim. ;)

Aluminium

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Re: River ice and Discharge
« Reply #59 on: May 29, 2020, 11:20:11 PM »
Water level reached 2622 cm in Kyusyur. It's not too far from the highest in 13 years. 2803 cm was in 2014 with daily discharge 173000 m3/s.

Aluminium

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Re: River ice and Discharge
« Reply #60 on: May 31, 2020, 11:34:39 PM »
2789 cm. Ice Queen of rivers is just 14 cm below the highest level in 13 years.

uniquorn

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Re: River ice and Discharge
« Reply #61 on: June 03, 2020, 09:58:40 AM »
Probably ridging near the ice edge preventing most surface meltwater reaching the sea. One arc of meltwater to the west looks like it is refreezing as it reaches the ice edge. Does meltwater pass under the ice as well? According to Hugh French in 'The Periglacial Environment', yes. Not sure whether that applies to that area of the delta though.
edit: took the coastline out to make it easier to see which parts of the delta have melted.
« Last Edit: June 03, 2020, 03:58:51 PM by uniquorn »

Aluminium

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Re: River ice and Discharge
« Reply #62 on: June 03, 2020, 03:17:07 PM »
May 24 - June 3. Dry land near the delta is flooded with river ice.

oren

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Re: River ice and Discharge
« Reply #63 on: June 03, 2020, 09:27:27 PM »
For some reason the gif is not playing for me.

Aluminium

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Re: River ice and Discharge
« Reply #64 on: June 03, 2020, 10:27:13 PM »
For some reason the gif is not playing for me.
I have no idea why. Sometimes I need to download an attached image manually and open it.

oren

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Re: River ice and Discharge
« Reply #65 on: June 03, 2020, 10:44:31 PM »
It does work in Chrome but not in MS Edge. Whatever...

grixm

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Re: River ice and Discharge
« Reply #66 on: June 05, 2020, 11:44:33 AM »
Not that it mattered much at this point, but the final ice of the Yenisei Gulf has broken up, meaning that there is free surface flow in the entire Yenisei river into the ocean.

blumenkraft

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Re: River ice and Discharge
« Reply #67 on: June 05, 2020, 01:58:27 PM »
Lena Delta (middle), 2019 vs. 2020

JayW

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Re: River ice and Discharge
« Reply #68 on: June 12, 2020, 11:12:31 AM »
Shortwave infrared bands on VIIRS shows the Lena river is now flowing into the Laptev, albeit in one little spot.

Contrast boosted for detail, click to run.
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blumenkraft

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Re: River ice and Discharge
« Reply #69 on: June 12, 2020, 11:38:00 AM »
Wow, that's amazing! Great job spotting it, Jay!

grixm

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Re: River ice and Discharge
« Reply #70 on: June 12, 2020, 02:19:42 PM »
You can see it clearly on worldview too:

binntho

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Re: River ice and Discharge
« Reply #71 on: June 13, 2020, 06:57:39 AM »
Perhaps the most interesting aspect of this discharge is the strong current along the coast - could it be wind driven?

EDIT: Having taken a closer look, it's clear that the current is to the west at beginning, but reversing towards the end of the animation. Could this be tidal movement?  :-X
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JayW

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Re: River ice and Discharge
« Reply #72 on: June 13, 2020, 01:12:14 PM »
Perhaps the most interesting aspect of this discharge is the strong current along the coast - could it be wind driven?

EDIT: Having taken a closer look, it's clear that the current is to the west at beginning, but reversing towards the end of the animation. Could this be tidal movement?  :-X
As soon as we have consecutive cloud free days in the area, I'll post a loop.  I'm not sure the animation I posted is long enough to be too sure.
  Initial thoughts would be ocean driven current that's modulated by tides.  Not sure there's quite enough open water for wind driven currents yet,  but I can't say with any certainty.
Edit: having said that,  a westerly wind at the ice edge there could be creating this effect.  I won't speculate further until we see more of it.
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JayW

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Re: River ice and Discharge
« Reply #73 on: June 20, 2020, 09:13:23 AM »
Edit: forgot to say it's the Lena river delta, in case it wasn't clear.
Roughly 84 hour loop.  Contrast boosted.  I'll speculate further.  Looks to me like the ocean current is the main driver, especially with more ice cover.  I do see what looks like a small tidal influence, but it's not driving things.  However as the ice melts and/or gets pushed out, the winds are playing an increasing role.  As theopen water expands, I'll zoom out to see how the water is spreading into the Laptev.  One last note, and this is highly speculative, but the sediment rich water spilling out appears to warm with the heating of the sun.

Click to animate.
« Last Edit: June 20, 2020, 09:54:51 AM by JayW »
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oren

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Re: River ice and Discharge
« Reply #74 on: June 20, 2020, 09:41:32 AM »
JayW - this animation is simply amazing. Thanks.

binntho

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Re: River ice and Discharge
« Reply #75 on: June 20, 2020, 01:35:48 PM »
JayW - this animation is simply amazing. Thanks.
Second that!
because a thing is eloquently expressed it should not be taken to be as necessarily true
St. Augustine, Confessions V, 6

Phoenix

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Re: The 2020 melting season
« Reply #76 on: July 19, 2020, 08:43:31 PM »
Attaching a research paper regarding the delayed July 2012 release of the Mackenzie River contents. A very influential event in the 2012 record which 2020 is chasing.

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013GL058956
« Last Edit: July 19, 2020, 09:10:20 PM by oren »