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GLACIER LAKE OUTBURST AND ITS PROCESS |
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by Swesha Dhamala | 28-03-2020 20:50
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A moraine dammed lake burst is a dangerous threat of GLOF in Nepal. Moraine dam materials are solely the debris consisting of large boulders, gravels, sand, silt, clay and dead glacier ice. Hence a lake formed by a moraine is usually a quite unstable condition. A moraine dammed glacier lake could burst in two ways a. a. dam breaks due to some external effects and b. Self-destruction due to the aging of moraine dam A. External triggers for a lake burst. Water in lakes overtopping carries a sufficient energy\to break a moraine dam easily. Once a beach is created on a moraine dam it leads to positive feedback for lake outburst running water excavates sand and erodes the breach wider and deeper which brings about further increase in the release of running water the over topping of lake water is caused by a big wave which us generated by a huge mass falling down in a lack such as snow or glacier avalanche from the steep slopes beside the lake and also advancing , sliding, and calving of he mother glacier into lake. Earthquake is an external trigger contributing to a lake burst. b. Self destruction of a moraine dam The self destruction of a moraine dam is also caused by the spontaneous failure of the well weathered dam slope and leakage from the networks of drainage conduits developed in dam. The dam break is closely correlated with the water level of the dam. The dam break is closely related with water level of the dam. The shape and size of the conuduits may change from season to season and year to year being frozen / diapered in the winter and being reopened during summer. Also a small conduit occasionally grows to a large conduit due to erosion by water. These drainage conduits tend to weaken the dam as a whole whereby the dam collapses spontaneously due to water pressure without particular triggering action.
Image source: RAOnline.CH
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26 Comments
thank you for the report
Posted 18-08-2020 18:32
Really informative, thank you for sharing
Posted 31-03-2020 00:37
it was Great, keep writing
Posted 30-03-2020 15:36
Thank you Jasmine.
Posted 30-03-2020 14:56
Greetings
I do hope everything is going well..
Thank you so much for sharing your report..
It was awesome to go through it and know about glacier lake outburst ans its process..
Hope to learn more from you..
Green cheers
Regards
Jasmine karki
Posted 29-03-2020 22:41
Thank you Rachu.
Posted 29-03-2020 19:12
Thank you Sameer.
Posted 29-03-2020 19:11
Great report.
Keep writing
Posted 29-03-2020 16:10
Thank you for sharing.
Keep writing.
Posted 29-03-2020 09:18
Thank you Susmita.
Posted 29-03-2020 01:37
Hello
I hope you are doing well
Thank you so much for this report
Green cheers
Warm regards
Susmita
Posted 29-03-2020 01:26
Thank you Rijana.
Posted 29-03-2020 00:15
Thanks for your report
Posted 28-03-2020 23:42
Thank you Anjila.
Posted 28-03-2020 23:29
Thank you Sonika.
Posted 28-03-2020 23:28
Hello Swesha,
I hope you are going great. Thankyou for the report.
GREEN CHEERS!
Regards,
Anjila
Posted 28-03-2020 22:39
Thank you sonika.
Posted 28-03-2020 21:32
Thank you Ganga.
Posted 28-03-2020 21:25
Thank you Ramesh
Posted 28-03-2020 21:24
Thank you Apsara.
Posted 28-03-2020 21:24
Hello Swesha!!
Thank you for sharing this with us!!
Keep on writing!!
GREEN CHEERS!!
Regards,
Sonika
Posted 28-03-2020 21:23
It is very informative, Keep writing such report.
Posted 28-03-2020 21:07
It is very informative.
Keep writing such report.
Posted 28-03-2020 21:07
It is very informative, Keep writing such wonderful report.
Posted 28-03-2020 21:06
Thank you Soyam.
Posted 28-03-2020 20:58
Hello Swesha!!
It is very informative.
Keep writing such report.
Warm regards,
Soyam
Posted 28-03-2020 20:57