Preliminary risk assessment of 22 glacial lakes following the April 2015 earthquake

Multi spectral WorldView02  image of the Thulagi, resolution : 2.5m/pixel
Multi spectral WorldView02 image of the Thulagi, resolution : 2.5m/pixel

Following the earthquake that hit Nepal in April 2015, some of the glacial lakes have probably been affected.

 

In august 2015, two members of GDH went to Kathmandu to collaborate with the Department of Hydrology and Meteorology (DHM) so as to carry out a preliminary hazard analysis of the 21 lakes considered most at risk.

 

To carry out this work, high-resolution satellite images and digital elevation models were used. During the study, we noticed that the Chola Tsho was still presenting a risk therefore, we decided to include it in the study.

 

The top five priorities regarding the 22 lakes is as follows:

  1. Tsho Rolpa
  2. Imja Tsho
  3. Thulagi lake
  4. Lower Barun and Chola Tsho
  5. Lumding Tsho

 

The aim of this study is to give a priority order of the lakes where it is urgent to carry out a thorough site investigation in order to develop a full scale hazard map.

 

During out stay in Kathmandu, we also trained an engineer from DHM to Geographic Information System (GIS) softwares.    

The data to make this map was kindly provided by ICIMOD. The 22nd lake does not appear here as it was not part of the initial list.
The data to make this map was kindly provided by ICIMOD. The 22nd lake does not appear here as it was not part of the initial list.

 

 

 

GDH would like to thank the IRIS foundation for having kindly funded this study and mission to Kathmandu.