报告题目：Understanding of cascading hazards for risk-informed decision making in the Himalayas  

报告人：Basanta Raj Adhikari

单位：Tribhuvan University, Nepal

时间：2022年10月27日下午15:00-17:00（周四）

ZOOM ID： 991 6405 7391

ZOOM密码：123456

报告人简介（150字左右）：

Dr. Basanta Raj Adhikari has done his PhD in Earth Science from the University of Vienna, Austria. Currently, he is a deputy director at Centre for Disaster Studies, Institute of Engineering, Tribhuvan University, Nepal and Distinguished Associate Professor (part-time) at the Institute for Disaster Management and Reconstruction, Sichuan University, China. His main research interests are on tectonics of the Himalaya, climate change, hill-slope movement and human interaction, Himalayan sediment flux generation, landslide Early Warning System, Multi-hazard risk assessment, community based disaster risk reduction and nature-based solutions. He has published more than 60 scientific research papers and book chapters and received various recognitions for his work in the field of earth science and disaster risk reduction. He has received various recognitions for his work in the field of earth science i.e., “young affiliates” (The World Academy of Sciences), “Sichuan 1000 Talents.

报告内容简介（150字左右）：

Nepal Himalaya is one of the seismically active mountain belts in the world with several kilometers of relief and very prone to catastrophic mass failure. The collision between Indian and Eurasian plates resulted numerous tectonic faults/thrusts and highly deformed rocks, which are responsible for triggering many earthquake of different scales. High grade of rock weathering and subsequent torrential rainfall are directly related to increase the numerous geo-hazard problems i.e., landslides, debris flow, and floods, etc. The Mw 7.8 Gorkha Earthquake-2015 has ruptured a 150-km long section of the Himalayan décollement and triggered many co-seismic landslide in the central Nepal. Moreover, rainfall-driven floods and glacial lake outburst floods are constant threat to the livelihoods and infrastructures. The recent events such as Seti Flood (2012), Chamoli flood (2021) and Melamchi debris flow (2021) have shown the scale of devastation in the Nepal Himalaya. The Seti Flood was created due to a large rock slope failure occurred at Sabque Crique, Annapurna range, Nepal. The collapsed material transported the whole material deposited in the upstream of the Seti River creating large scale debris flow. More than 70 people lost their lives and many infrastructures were collapsed. Similarly, the catastrophic debris flow at Melamchi Bazaar killed at least 5 people and damaged major infrastructures including Melamchi Water Supply Project. This debris flow caused wide-spread aggradation along tens of kilometer of Melamchi River corridor, with up to 15 meters of deposition in the town of Melamchi Bazaar. The source of these deposits lie in the upper catchment of the Melamchi River at an elevation of ~3600m, where ~ 100 million m3 sediments was stored behind a paleo-landslide dam. These cascading events highlight the importance of understanding paleo-landslide dam, glacial moraine or other geomorphic process in the mountain catchment. Moreover, the coupling effect of reoccurring earthquake and strong Asian monsoon have negative impacts to the livelihood in the mountainous region. This is because most of the human settlements lie within the large scale landslides and river corridors. Therefore, it is utmost necessity to map and locate geomorphic and tectonic features to understand the potential hazards in the mountain ecosystem.

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