Limits to hydropower expansion in the Himalayas

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Fig_S1_GEARTH_blog
The Upper Trishuli 3A hydropower project following the Gorkha Earthquake in 2015. Red lines are mapped coseismic landslides.

The 2015 Gorkha earthquake in Nepal caused severe losses in the hydropower sector. The country temporarily lost ~20% of its hydropower capacity, and >30 hydropower projects were damaged. In our paper that was just published in Geophysical Research Letters, we show that the projects hit hardest were those that were affected by earthquake‐triggered landslides. These projects are located along very steep rivers with towering sidewalls that are prone to become unstable during strong seismic ground shaking. A statistical classification based on a topographic metric that expresses river steepness and earthquake ground acceleration is able to approximately predict hydropower damage during future earthquakes, based on successful testing of past cases. Thus, our model enables us to estimate earthquake damages to hydropower projects in other parts of the Himalayas. We find that >10% of the Himalayan drainage network may be unsuitable for hydropower infrastructure given high probabilities of high earthquake damages.

Of course, we conducted the analysis primarily using TopoToolbox. A few functions that we used and partly developed for the purpose of our analysis are

  • STREAMobj/chitransform
  • STREAMobj/mchi
  • STREAMobj/smooth
  • STREAMobj/hillslopearea

References

Schwanghart, W., Ryan, M., Korup, O., 2018. Topographic and seismic constraints on the vulnerability of Himalayan hydropower. Geophysical Research Letters, in press. [DOI: 10.1029/2018GL079173]

see also Nature News article by Jane Qiu, 2018. Landslides pose threat to Himalayan hydropower dream. [DOI: 10.1038/d41586-018-06212-8]

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