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    • Keywords


      Slope instability; landslide; Lesser Himalaya; remote sensing; radar interferometry.

    • Abstract


      Orogenic movements and sub-tropical climate have rendered the slopes of the Himalayan region intensely deformed and weathered. As a result, the incidences of slope failure are quite common all along the Himalayan region. The Lesser Himalayan terrane is particularly vulnerable to mass-movements owing togeological fragility, and many parts of it are bearing a high-risk of associated disaster owing to the high population density. An important step towards mitigation of such disasters is the monitoring of slope movement. Towards this, the Persistent Scatterer Interferometry (PSI) technique can be applied. In the present study, the PSI technique is employed in Lesser Himalayan town of Nainital in Uttarakhandstate of India to decipher and monitor slope movements. A total of 15 multi-date ENVISAT ASAR satellite images, acquired during August 2008 to August 2010 period, were subjected to PSI, which revealed a continuous creep movement along the hillslopes located towards the eastern side of the Nainital lake. The higher reaches of the hill seem to be experiencing accelerated creep of ~21mm/year, which decreases downslope to ~5mm/year. Based on spatial pattern of varying PSI Mean LOS Velocity (MLV) values, high (H), moderate (M), low (L) and very low (S) creeping zones have been delineated in thehillslopes. Given the long history of mass movements and continuously increasing anthropogenic activities in Nainital, these results call for immediate measures to avert any future disaster in the town.

    • Author Affiliations


      Akano Yhokha1 Pradeep K Goswami2 Chung-Pai Chang1 3 Jiun-Yee Yen4 Kuo-En Ching5 K Manini Aruche3

      1. Department of Earth Sciences and Institute of Geophysics, National Central University, Taoyuan, Taiwan.
      2. Centre of Advanced Study, Department of Geology, Kumaun University, Nainital, India.
      3. Centre for Space and Remote Sensing Research, National Central University, Taoyuan, Taiwan.
      4. Department of Natural Resource and Environment Studies, National Dong Hwa University, Hualien, Taiwan.
      5. Department of Geomatics, National Cheng-Kung University, Tainan, Taiwan.
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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