Kim, Dong Eun Seong, Yeong Bae Choi, Kwang Hee Yu, Byung Yong 2024-01-20T01:34:36Z 2024-01-20T01:34:36Z 2022-01-25 2017-04 1672-6316 https://pubs.kist.re.kr/handle/201004/122868 The concentration of cosmogenic Be-10 in riverine sediments has been widely used as a proxy for catchment-wide denudation rate (CWDR). One of the key assumptions of this approach is that sediments originating from sub-basins with different erosional histories are well mixed. A tragic debris flow occurred in the Seti River watershed, central Nepal, on May 5, 2012. This catastrophic debris flow was triggered by slope failure on the peak of Annapurna IV and resulted in many casualties in the lower Seti Khola. However, it provided an opportunity to test the assumption of equal mixing of sediments in an understudied rapidly eroding watershed. This study documents the CWDR of Be-10 to evaluate the extent of the influence of episodic erosional processes such as debris flow on the spatio-temporal redistribution of 10Be concentrations. Our data show that the debris flow caused little change in CWDR across the debris flow event. In addition to isotopic measurement, we calculated denudation rates by using the modeled concentrations in pre- and post-landslide sediments based on the local 10Be production rate. The modeled result showed little change across the event, indicating that the debris flow in May 2012 played a minor role in sediment evacuation, despite the rapid erosion in the catchment. Our study concludes that although the 2012 event caused many casualties and severe damage, it was a low-magnitude, high frequency event. English SCIENCE PRESS Role of debris flow on the change of Be-10 concentration in rapidly eroding watersheds: a case study on the Seti River, central Nepal Article 10.1007/s11629-016-4282-y 1 JOURNAL OF MOUNTAIN SCIENCE, v.14, no.4, pp.716 - 730 JOURNAL OF MOUNTAIN SCIENCE 14 4 716 730 N scie scopus 000399086200009 2-s2.0-85016575429 Environmental Sciences Environmental Sciences & Ecology Article EROSION RATES COSMOGENIC RADIONUCLIDES DENUDATION RATES HALF-LIFE RAINFALL HIMALAYAS INCISION RELIEF DISEQUILIBRIUM PRECIPITATION Seti River Beryllium-10 (Be-10) Catchment-wide denudation rate (CWDR) Debris flow Episodic erosional processes