The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses

Abstract We use multitemporal analyses based on Synthetic Aperture Radar differential interferometry (DInSAR) to study the slope adjacent to the large Punatsangchhu-I hydropower plant, a concrete gravity dam under construction in Bhutan since 2009. Several slope failures affected the site since 2013...

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Autores principales:	Benedetta Dini, Andrea Manconi, Simon Loew, Jamyang Chophel
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4cae0fd0b26a4717982f62737154178f
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spelling	oai:doaj.org-article:4cae0fd0b26a4717982f62737154178f2021-12-02T14:58:53ZThe Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses10.1038/s41598-020-65192-w2045-2322https://doaj.org/article/4cae0fd0b26a4717982f62737154178f2020-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-65192-whttps://doaj.org/toc/2045-2322Abstract We use multitemporal analyses based on Synthetic Aperture Radar differential interferometry (DInSAR) to study the slope adjacent to the large Punatsangchhu-I hydropower plant, a concrete gravity dam under construction in Bhutan since 2009. Several slope failures affected the site since 2013, probably as a consequence of toe undercutting of a previously unrecognised active landslide. Our results indicate that downslope displacement, likely related to the natural instability, was already visible in 2007 on various sectors of the entire valley flank. Moreover, the area with active displacements impinging on the dam site has continuously increased in size since 2007 and into 2018, even though stabilization measures have been implemented since 2013. Stabilisation measures currently only focus on a small portion of the slope, however, the unstable area is larger than previously evaluated. Highly damaged rock is present across many areas of the entire valley flank, indicating that the volumes involved may be orders of magnitude higher than the area on which stabilisation efforts have been concentrated after the 2013 failure. The results highlight that satellite-based DInSAR could be systematically used to support decision making processes in the different phases of a complex hydropower project, from the feasibility study, to the dam site selection and construction phase.Benedetta DiniAndrea ManconiSimon LoewJamyang ChophelNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-10 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Benedetta Dini Andrea Manconi Simon Loew Jamyang Chophel The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses
description	Abstract We use multitemporal analyses based on Synthetic Aperture Radar differential interferometry (DInSAR) to study the slope adjacent to the large Punatsangchhu-I hydropower plant, a concrete gravity dam under construction in Bhutan since 2009. Several slope failures affected the site since 2013, probably as a consequence of toe undercutting of a previously unrecognised active landslide. Our results indicate that downslope displacement, likely related to the natural instability, was already visible in 2007 on various sectors of the entire valley flank. Moreover, the area with active displacements impinging on the dam site has continuously increased in size since 2007 and into 2018, even though stabilization measures have been implemented since 2013. Stabilisation measures currently only focus on a small portion of the slope, however, the unstable area is larger than previously evaluated. Highly damaged rock is present across many areas of the entire valley flank, indicating that the volumes involved may be orders of magnitude higher than the area on which stabilisation efforts have been concentrated after the 2013 failure. The results highlight that satellite-based DInSAR could be systematically used to support decision making processes in the different phases of a complex hydropower project, from the feasibility study, to the dam site selection and construction phase.
format	article
author	Benedetta Dini Andrea Manconi Simon Loew Jamyang Chophel
author_facet	Benedetta Dini Andrea Manconi Simon Loew Jamyang Chophel
author_sort	Benedetta Dini
title	The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses
title_short	The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses
title_full	The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses
title_fullStr	The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses
title_full_unstemmed	The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses
title_sort	punatsangchhu-i dam landslide illuminated by insar multitemporal analyses
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/4cae0fd0b26a4717982f62737154178f
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The Punatsangchhu-I dam landslide illuminated by InSAR multitemporal analyses

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