Instability index derived from a landslide inventory for watershed stability assessment and mapping

Cheng Chien Liu, Ming Hsun Ko, Huei Lin Wen, Kuei Lin Fu, Shu Ting Chang

Research output: Contribution to journalArticle

Abstract

Watersheds represent natural units of social–ecological systems and affect crop productivity. Extreme weather events accelerate the natural erosion process by triggering more landslides in watersheds. To achieve the land degradation neutrality set up by the UN’s Sustainable Development Goals, it is necessary to assess and map spatiotemporal landslides in watersheds. This paper proposes an innovative approach to calculating the instability index by preparing an annual landslide inventory, determining the optimum sub-watershed, compensating for shadow effects on the time series of the landslide area ratio, and classifying the standard deviations to different levels of instability. Taking the Qingquan watershed as an example, the instability index calculated for 22 sub-watersheds makes it possible to identify hot spots that are prone to collapse. This new index can also be used to evaluate the effectiveness of watershed management before and after completion of a specific engineering project, as well as to update the latest upriver situation to evaluate current management practices and develop strategies for future planning. Based on this new approach, the Soil and Water Conservation Bureau of Taiwan assesses the stability of 28 watersheds, and the results are made available on the Big Geospatial Information System.

Original languageEnglish
Article number145
JournalISPRS International Journal of Geo-Information
Volume8
Issue number3
DOIs
Publication statusPublished - 2019 Mar

Fingerprint

Landslides
Watersheds
landslide
watershed
neutrality
management
time series
erosion
UNO
Taiwan
information system
sustainable development
conservation
productivity
engineering
water
planning
event
Soil conservation
Water conservation

All Science Journal Classification (ASJC) codes

  • Geography, Planning and Development
  • Computers in Earth Sciences
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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title = "Instability index derived from a landslide inventory for watershed stability assessment and mapping",
abstract = "Watersheds represent natural units of social–ecological systems and affect crop productivity. Extreme weather events accelerate the natural erosion process by triggering more landslides in watersheds. To achieve the land degradation neutrality set up by the UN’s Sustainable Development Goals, it is necessary to assess and map spatiotemporal landslides in watersheds. This paper proposes an innovative approach to calculating the instability index by preparing an annual landslide inventory, determining the optimum sub-watershed, compensating for shadow effects on the time series of the landslide area ratio, and classifying the standard deviations to different levels of instability. Taking the Qingquan watershed as an example, the instability index calculated for 22 sub-watersheds makes it possible to identify hot spots that are prone to collapse. This new index can also be used to evaluate the effectiveness of watershed management before and after completion of a specific engineering project, as well as to update the latest upriver situation to evaluate current management practices and develop strategies for future planning. Based on this new approach, the Soil and Water Conservation Bureau of Taiwan assesses the stability of 28 watersheds, and the results are made available on the Big Geospatial Information System.",
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Instability index derived from a landslide inventory for watershed stability assessment and mapping. / Liu, Cheng Chien; Ko, Ming Hsun; Wen, Huei Lin; Fu, Kuei Lin; Chang, Shu Ting.

In: ISPRS International Journal of Geo-Information, Vol. 8, No. 3, 145, 03.2019.

Research output: Contribution to journalArticle

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