ASSESSING the AFFECTED AREA of TYPHOON-INDUCED LANDSLIDES and DEBRIS FLOWS

Chen Hsiao Hsuan, Chiang Shou Hao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Typhoon events are often accompanied by short-duration intense rainfall. If the slopes are steep and rich in loose soil, rocks, or colluvium, it is prone to induce significant debris flows and landslides, causing heavy casualties and economic losses. The occurrence of debris flows and landslides is influenced by geology, topography, and the hydrological environment. To assess the affected area of the combined process, the landslide and debris flow requires an integrated modeling framework. This study proposed an integrated slope stability model which combines infinite slope stability analysis and debris flow simulation to predict the initiation of typhoon-induced shallow landslides and runout paths. The landslide event induced by Typhoon Saola in Heping Village, Xiulin Township, Hualien County on August 2, 2012, is selected as the study case. By investigating geological, hydrological parameters, and topographic characteristics, the model is expected to predict the affected area of landslides and debris flows in the study areas. Satellite imagery was used to effectively estimate regional parameters for the model application, including vegetation index and topographic variables. Preliminary modeling outcomes, including the landslide location and its runouts, will be validated by comparing with the high-resolution optical image and in-situ investigation data. The research results can be used as a reference for the assessment of the affected area of landslides and debris flows in the future.

Original languageEnglish
Title of host publication42nd Asian Conference on Remote Sensing, ACRS 2021
PublisherAsian Association on Remote Sensing
ISBN (Electronic)9781713843818
StatePublished - 2021
Event42nd Asian Conference on Remote Sensing, ACRS 2021 - Can Tho, Viet Nam
Duration: 22 Nov 202126 Nov 2021

Publication series

Name42nd Asian Conference on Remote Sensing, ACRS 2021

Conference

Conference42nd Asian Conference on Remote Sensing, ACRS 2021
Country/TerritoryViet Nam
CityCan Tho
Period22/11/2126/11/21

Keywords

  • Debris Flow
  • Integrated Slope Stability Model
  • Shallow Landslide
  • Typhoon Saola
  • Vegetation Index

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