Abstract
Kathmandu Kyirong Highway (KKH) is one of the most strategic Sino-Nepal highways. Low-cost mitigation measures are common in Nepalese highways, however, they are not even applied sufficiently to control slope instability since the major part of this highway falls still under the category of feeder road, and thus less resources are made available for its maintenance. It is subjected to frequent landslide events in an annual basis, especially during monsoon season. The Gorkha earthquake, 2015 further mobilized substantial hillslope materials and damaged the road in several locations. The aim of this research is to access the dynamic landslide susceptibility considering pre, co and post seismic mass failures. We mapped 5,349 multi-temporal landslides of 15 years (2004–2018), using high resolution satellite images and field data, and grouped them in aforementioned three time periods. Landslide susceptibility was assessed with the application of ‘certainty factor’ (CF). Seventy percent landslides were used for susceptibility modelling and 30% for validation. The obtained results were evaluated by plotting ‘receiver operative characteristic’ (ROC) curves. The CF performed well with the ‘area under curve’ (AUC) 0.820, 0.875 and 0.817 for the success rates, and 0.809, 0.890 and 0.760 for the prediction rates for respective pre, co and post seismic landslide susceptibility. The accuracy for seismic landslide susceptibility was better than pre and post-quake ones. It might be because of the differences on completeness of the landslide inventory, which might have been possibly done better for the single event based co-seismic landslide map** in comparison with multitemporal inventories in pre and post-quake situations. The results obtained in this study provide insights on dynamic spatial probability of landslide occurrences in the changing condition of triggering agents. This work can be a good contribution to the methodologies for the evaluation of the dynamic landslide hazard and risk, which will further help to design the efficient mitigation measures along the mountain highways.
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23 December 2020
The “ALOS PULSAR DEM” is incorrect in the original article. The correct one should be “ALOS PALSAR DEM”.
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Acknowledgements
This research got financial support from major project of National Natural Science Foundation of China (Grant No.41941017 and 41790432), Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDY-SSW-DQC006), International Partnership Program, Chinese Academy of Sciences (Grant number 131551KYSB20180042), Strategic Priority Research Program, Chinese Academy of Sciences (Grant No XDA20030301), and Organization for women in Science for Develo** World (OWSD) and Swedish International Development Corporation Agency (SIDA). The authors thank to Mr. Biren G C, Mr. Anil Regmi, Mr. Ashok Maharjan, and Mr. Rupesh Chhetri for assisting field investigation and survey.
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Dhakal, S., Cui, P., Su, Lj. et al. Landslide susceptibility assessment at Kathmandu Kyirong Highway Corridor in pre-quake, co-seismic and post-quake situations. J. Mt. Sci. 17, 2652–2673 (2020). https://doi.org/10.1007/s11629-020-6314-x
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DOI: https://doi.org/10.1007/s11629-020-6314-x