Point Conception
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- Hundreds of Trekkers Missing in Nepal Flooding
Flooding in Nepal - Glacier Collapse
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256bits
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You might want to factual check for sensationalism in this one paragraph:
Equations
1. Potential Energy of 1 kg of water at height
E = m g h --> mass 1 kg, g = 9.81 m/s/s, h = 1200 m ( Assuming 1200m as height, and not glacial path length )
E = 11.8 kJ
Temperature rise of 1 kg water from heat addition Q
dt = Q / ( m Cp ) Q = 11.8 kJ, , = 1 kg, Cp = 4.2kJ / ( kg C )
dt = 2.8 C
Edit:
dt = Q / ( m Cp ) Q = 11.8 kJ, , = 1 kg, Cp = 2.050 kJ / ( kg C )
dt = 5.76 C
I would take the2.8 C 5.76 C temperature increase due to conversion of potential energy to heat energy to mean that the chunk of glacier ice had already approached melting temperature, lost its cohesive strength and broke away, travelled down the glacial valley on the incline ( not straight down ) and completely liquified into a slush ( ie disintegrated into a mixture of ice particles and water ) during decent.
Reaching warmer temperatures along the path 50 km further down the valley, all of the slush would become water.
Equations
1. Potential Energy of 1 kg of water at height
E = m g h --> mass 1 kg, g = 9.81 m/s/s, h = 1200 m ( Assuming 1200m as height, and not glacial path length )
E = 11.8 kJ
Temperature rise of 1 kg water from heat addition Q
dt = 2.8 C
Edit:
dt = Q / ( m Cp ) Q = 11.8 kJ, , = 1 kg, Cp = 2.050 kJ / ( kg C )
dt = 5.76 C
I would take the
Reaching warmer temperatures along the path 50 km further down the valley, all of the slush would become water.
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The videos are terrifying
https://www.nytimes.com/2026/08/26/world/asia/nepal-flood-glacier-ice-avalanche.html
Unfortunately I think we'll see more of this with glaciers continuing to melt.
https://www.nytimes.com/2026/08/26/world/asia/nepal-flood-glacier-ice-avalanche.html
Unfortunately I think we'll see more of this with glaciers continuing to melt.
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Point Conception said:
gmax137 said:
Greg Bernhardt said:
Agreed- I have never seen anything like that.
256bits
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Right. I incorrectly used the Cp for change in degree for water, instead of that for ice.Point Conception said:
Equations
1. Potential Energy of 1 kg of water at height
E = m g h --> mass 1 kg, g = 9.81 m/s/s, h = 1200 m ( Assuming 1200m as height, and not glacial path length )
E = 11.8 kJ
Temperature rise of 1 kg water from heat addition Q
dt = Q / ( m Cp ) Q = 11.8 kJ, , = 1 kg, Cp = 2.050 kJ / ( kg C )
dt = 5.76 C
The chunk of ice would have risen in temperature of 5.76 degrees C from the drop.
And then there is the phase change to water, as you have expressed.
Post #3 edited
sbrothy
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Greg Bernhardt said:
It sounds so bad I serioulsy don't want to look!
256bits
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Some discussion from Jakob Steiner, a geoscientist at the University of Graz in Austria
and Glaciologist Simon Cook, University of Dundee, Scotland.
Satellite image at the 1:42 mark.
and Glaciologist Simon Cook, University of Dundee, Scotland.
Satellite image at the 1:42 mark.
256bits
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Some video of the deluge. Viewer beware.
( I find she babbles a bit much, but that's just me, 229 subscribers she has )
1. Question of where all the water came from.
2. Blocked lake upriver posing a risk of secondary water cascade
3. Seismic recordings were that of the deluge ( not an earthquake in the normal sense )
( I find she babbles a bit much, but that's just me, 229 subscribers she has )
1. Question of where all the water came from.
2. Blocked lake upriver posing a risk of secondary water cascade
3. Seismic recordings were that of the deluge ( not an earthquake in the normal sense )