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New model of hazard potential index based on slope land disturbance and regional carrying capacity: a case study of Namaxia District in Kaohsiung City, Taiwan

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Abstract

In the last few decades, the economic activities have been growing fast in slope land of Taiwan. To investigate the effect of slope disturbance by slope utilization on the landslide potential, this study employed the concepts of regional carrying capacity, natural environment, and slope utilization to establish a hazard potential index based on slope land disturbance (IHSD) to define the extent of slope development and utilization. Furthermore, combined with the product of the effective accumulated rainfall (EAR) and the maximum 3-h rolling rainfall intensity (I3Rmax), logistic regression was used to establish a landslide potential model. The results revealed that the landslide grid ratio had a tendency to increase as the IHSD interval value increased, when the IHSD value reached approximately 350 and the rainfall index EAR × I3Rmax exceeded 20,000 (mm2/3 h), landslide probability was high. Moreover, the overall accuracy of the landslide probability assessment model that was established using IHSD combined with rainfall indicators was approximately 78%. As the average rainfall index of each rainfall event increased, the number of historical disaster points located in such areas also generally increased.

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The data sets of geology data, rainfall data, satellite images, and topography data can be provided on request from the institutions and projects mentioned in the acknowledgements.

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Acknowledgements

This work was supported in part by grants from Taiwan Ministry of Science and Technology (MOST 107-2625-M-309-002 and MOST 108-2625-M-309-002).

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Correspondence to Chih-Ming Tseng.

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Chen, YR., Chang, CM., Tseng, CM. et al. New model of hazard potential index based on slope land disturbance and regional carrying capacity: a case study of Namaxia District in Kaohsiung City, Taiwan. Environ Earth Sci 80, 440 (2021). https://doi.org/10.1007/s12665-021-09736-x

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  • DOI: https://doi.org/10.1007/s12665-021-09736-x

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