sustainability Article Reconstructing the History of Glacial Lake Outburst Floods (GLOF) in the Kanchenjunga Conservation Area, East Nepal: An Interdisciplinary Approach Alton C. Byers 1,*, Mohan Bahadur Chand 2 , Jonathan Lala 3, Milan Shrestha 4 , Elizabeth A. Byers 5 and Teiji Watanabe 2 1 Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, CO 80309, USA 2 Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan;
[email protected] (M.B.C.);
[email protected] (T.W.) 3 Department of Civil & Environmental Engineering, University of Wisconsin, Madison, WI 53706, USA;
[email protected] 4 School of Sustainability, Arizona State University, Tempe, AZ 85287, USA;
[email protected] 5 West Virginia Department of Environmental Protection, Charleston, WV 25304, USA;
[email protected] * Correspondence:
[email protected] Received: 2 June 2020; Accepted: 26 June 2020; Published: 3 July 2020 Abstract: An interdisciplinary field investigation of historic glacial lake outburst floods (GLOFs) in the Kanchenjunga region of Nepal was conducted between April and May, 2019. Oral history and field measurements suggested that at least six major GLOFs have occurred in the region since 1921. A remote sensing analysis confirmed the occurrence of the six GLOFs mentioned by informants, including two smaller flood events not mentioned that had occurred at some point before 1962. A numerical simulation of the Nangama GLOF suggested that it was triggered by an ice/debris avalanche of some 800,000 m3 of material, causing a surge wave that breached the terminal moraine and released an estimated 11.2 106 m3 1.4 106 m3 of water.