Quantitative evaluation of debris flow provenance erosion based on Airborne Lidar Technology

ZHAO Cong; TIE Yongbo; LIANG Jingtao

doi:10.19826/j.cnki.1009-3850.2021.09004

2023 Vol. 43, No. 4

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Article navigation > Sedimentary Geology and Tethyan Geology > 2023 > 43(4): 808-816

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ZHAO Cong, TIE Yongbo, LIANG Jingtao. 2023. Quantitative evaluation of debris flow provenance erosion based on Airborne Lidar Technology. Sedimentary Geology and Tethyan Geology, 43(4): 808-816. doi: 10.19826/j.cnki.1009-3850.2021.09004

Citation:

ZHAO Cong, TIE Yongbo, LIANG Jingtao. 2023. Quantitative evaluation of debris flow provenance erosion based on Airborne Lidar Technology. Sedimentary Geology and Tethyan Geology, 43(4): 808-816. doi: 10.19826/j.cnki.1009-3850.2021.09004

Quantitative evaluation of debris flow provenance erosion based on Airborne Lidar Technology

1.
Sichuan Geological Survey/Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Chengdu 610081, China
2.
Chengdu Center, China Geological Survey (Geosciences Innovation Center of Southwest China), Chengdu 610218, China

More Information

Corresponding author: LIANG Jingtao, 550124235@qq.com

Received Date: 30 April 2021

Revised Date: 04 September 2021

Accepted Date: 13 September 2021

Publish Date: 31 December 2023

Abstract

Abstract

The material source is one of the three basic conditions for the formation of debris flow, and the change in erosion accumulation of the material source is an important index to measure the scale and frequency of debris flow. Currently, conventional techniques are still unable to achieve quantitative research on the change in source erosion accumulation. To solve this problem, this paper takes the gully debris flow at the back of the Qionghai water plant in Xichang City as an example, based on two periods of optical images and high-precision DEM (Digital Elevation Model) by LiDAR before and after the rainy season, carries out quantitative evaluation of debris flow provenance erosion. The results show that: the fire area of the basin is 65%, and there are slope erosion provenance, landslide provenance and gully accumulation sources in the basin. According to the superposition analysis of two high-precision DEM datasets, the source erosion amount of debris flow before and after the rainy season is 12209 cubic metres. The source erosion area is characterized by wide distribution, large number and scattered development. The debris flow is mainly caused by slope material source erosion, and the majority of the erosion thickness is within 0.5 m. Therefore, there will be high frequency debris flow in the future.
- High precision DEM /
- debris flow /
- airborne LiDAR /
- source erosion

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References

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