EGU22-6045, updated on 28 Mar 2022
https://doi.org/10.5194/egusphere-egu22-6045
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Integrated numerical modeling of a large debris flow in the Meilong catchment, China

Hui-Cong An, Chao-Jun Ouyang, and Fu-Lei Wang
Hui-Cong An et al.
  • Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences (CAS), Chengdu, China

On June 17, 2020, a large debris flow occurred in the Meilong catchment following a short-duration, high-intensity rainstorm. The debris flow was initiated by two shallow landsides upstream of the catchment and had a volume of approximately 7.7×105 m3. It blocked the river and then induced flooding, which caused a great loss to the local residents. Through a combination of field observation, image interpretation and laboratory experiments, the initiation mechanism, erosion depth along the main channel and deposition area of this debris flow were comprehensively analyzed. A sequentially integrated numerical model considering the vegetation interception, infiltration and runoff process was developed. Considering the spatial variations in the climatic, hydrological and geotechnical parameters, the whole process of debris flow initiation, motion, entrainment and deposition were simulated. The computational outcomes matched well with the field observation results. A combination of the proposed integrated model and spatially varying parameters can be used to effectively describe the debris flow characteristics in the initiation and propagation stages and provide significant insights into physical processes involved in such hazards.

How to cite: An, H.-C., Ouyang, C.-J., and Wang, F.-L.: Integrated numerical modeling of a large debris flow in the Meilong catchment, China, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-6045, https://doi.org/10.5194/egusphere-egu22-6045, 2022.

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