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GLACIER LAKE OUTBURST AND ITS PROCESS

by Swesha Dhamala | 28-03-2020 20:50 recommendations 0

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

  • Sushma Sapkota says :
    Really informative, thank you for sharing
    Posted 31-03-2020 00:37

  • Sushma Sapkota says :
    it was Great, keep writing
    Posted 30-03-2020 15:36

  • Jasmine Karki says :
    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

  • Rachu Khanal says :
    Great report.
    Keep writing
    Posted 29-03-2020 16:10

  • Sameer Singh says :
    Thank you for sharing.
    Keep writing.
    Posted 29-03-2020 09:18

  • Susmita Adhikari says :
    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

  • Anjila Pandey says :
    Hello Swesha,
    I hope you are going great. Thankyou for the report.
    GREEN CHEERS!
    Regards,
    Anjila
    Posted 28-03-2020 22:39

Sonika Pariyar

  • Sonika Pariyar says :
    Hello Swesha!!

    Thank you for sharing this with us!!
    Keep on writing!!

    GREEN CHEERS!!
    Regards,
    Sonika
    Posted 28-03-2020 21:23

  • Ganga Timilsina says :
    It is very informative, Keep writing such report.
    Posted 28-03-2020 21:07

  • Ramesh Oli says :
    It is very informative.
    Keep writing such report.
    Posted 28-03-2020 21:07

  • Apsara Sapkota says :
    It is very informative, Keep writing such wonderful report.
    Posted 28-03-2020 21:06

  • Soyam Dhamala says :
    Hello Swesha!!

    It is very informative.
    Keep writing such report.

    Warm regards,
    Soyam
    Posted 28-03-2020 20:57

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