Abstract
When performing a landslide susceptibility analysis, a model is usually established on the basis of a multi-temporal or event-triggered landslide inventory. Because multi-temporal landslide inventories for most areas are rarely available, an event-triggered landslide inventory is often used, but the result depends on the selection of single event. In order to establish a landslide susceptibility model with a good prediction performance, the present study tried to find out how to select a single event-triggered landslide inventory, and investigated the effect of various combinations of event inventories. We selected Shihmen reservoir watershed as the research area, conducted a logistic regression analysis to build 23 event-based landslide susceptibility models and one multi-year landslide susceptibility model, and estimated the performance of these models. In addition, this study further assessed the influence of event characteristics on the model prediction performance, used the above results to merge two different events, and then established models based on these combinations. The results indicated that when establishing an event-based landslide susceptibility model, selecting events with suitable rainfall return periods and landslide density can yield robust models with relatively high predictive ability. Furthermore, the combination of two events which negatively correlate with each other in rainfall spatial distributions can enhance a model’s predictive ability and modeling efficiency.
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Abbreviations
- ACC:
-
Accuracy
- AUROC:
-
Area under the receiver operating characteristic curve
- AUSRC:
-
Area under the success rate curve
- DEM:
-
Digital elevation model
- FPR:
-
False positive rate
- LISA:
-
Local indicators of spatial association
- ROC:
-
Receiver operating characteristic
- SRC:
-
Success rate curve
- TPR:
-
True positive rate
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Acknowledgements
The authors would like to thank the Water Resources Agency, MOEA, Taiwan for providing rainfall data, and C.L. Hsueh for her work on the event-based landslide inventories. We sincerely thank anonymous reviewers for helpful comments on earlier drafts of the manuscript.
Funding
This work was supported by the Ministry of Science and Technology, Taiwan, under Grant No. MOST 108–2625-M-005–003.
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Conceptualization: CYW; Methodology: CYW and SYL; Formal analysis and investigation: CYW and SYL; Writing—original draft preparation: CYW and SYL; Writing—review and editing: CYW; Funding acquisition: CYW. All authors read and approved the final manuscript.
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Appendices
Appendix 1
Overview of the satellite image data used over the period of 1996 to 2015
Typhoon event | Pre-event satellite image | Post-event satellite image | ||||||
---|---|---|---|---|---|---|---|---|
Date | Resolution | Band | Source | Date | Resolution | Band | Source | |
1-Herb | 1996/01/01 | 10.0 m | Pan | SPOT 2 | 1996/11/08 | 10.0 m | Pan | SPOT 2 |
2-Xangsane | 2000/10/11 | 10.0 m | Pan | SPOT 1 | 2001/03/15 | 10.0 m | Pan | SPOT 2 |
3-Toraji | 2001/03/15 | 10.0 m | Pan | SPOT 2 | 2001/08/22 | 10.0 m | Pan | SPOT 2 |
4-Nari | 2001/08/22 | 10.0 m | Pan | SPOT 2 | 2001/10/13 | 10.0 m | Pan | SPOT 2 |
5-Aere | 2004/02/10 | 2.5 m | Pan | SPOT 5 | 2004/11/02 | 2.5 m | Pan | SPOT 5 |
6-Haitang | 2005/03/16 | 2.5 m | Pan | SPOT 5 | 2005/07/25 | 2.0 m | Pan | FORMOSAT 2 |
7-Matsa | 2005/07/25 | 2.0 m | Pan | FORMOSAT 2 | 2005/08/16 | 2.0 m | Pan | FORMOSAT 2 |
8-Talim | 2005/08/16 | 2.0 m | Pan | FORMOSAT 2 | 2005/09/09 | 2.0 m | Pan | FORMOSAT 2 |
9-Longwang | 2005/09/09 | 2.0 m | Pan | FORMOSAT 2 | 2005/11/11 | 2.5 m | Pan | SPOT 5 |
10-Shanshan | 2005/11/11 | 2.5 m | Pan | SPOT 5 | 2006/10/20 | 2.5 m | Pan | SPOT 5 |
11-Krosa | 2007/08/28 | 2.5 m | Pan | SPOT 5 | 2007/12/21 | 2.5 m | Pan | SPOT 5 |
12-Jangmi | 2008/08/24 | 2.0 m | Pan | FORMOSAT 2 | 2008/11/02 | 2.5 m | Pan | SPOT 5 |
13-Morakot | 2009/05/08 | 2.5 m | Pan | SPOT 5 | 2009/08/20 | 2.5 m | Pan | SPOT 5 |
14-Parma | 2009/08/20 | 2.5 m | Pan | SPOT 5 | 2009/10/21 | 2.5 m | Pan | SPOT 5 |
15-Fanapi | 2010/04/01 | 2.5 m | Pan | SPOT 5 | 2010/09/22 | 2.0 m | Pan | FORMOSAT 2 |
16-Megi | 2010/09/22 | 2.0 m | Pan | FORMOSAT 2 | 2010/11/01 | 2.0 m | Pan | FORMOSAT 2 |
17-Meari | 2011/04/20 | 2.0 m | Pan | FORMOSAT 2 | 2011/07/28 | 2.0 m | Pan | FORMOSAT 2 |
18-Nanmadol | 2011/07/28 | 2.0 m | Pan | FORMOSAT 2 | 2011/09/17 | 2.0 m | Pan | FORMOSAT 2 |
19-Talim(2) | 2011/09/17 | 2.0 m | Pan | FORMOSAT 2 | 2012/07/02 | 2.0 m | Pan | FORMOSAT 2 |
20-Saola | 2012/07/02 | 2.0 m | Pan | FORMOSAT 2 | 2012/08/15 | 2.0 m | Pan | FORMOSAT 2 |
21-Soulik | 2012/08/15 | 2.0 m | Pan | FORMOSAT 2 | 2013/08/04 | 2.0 m | Pan | FORMOSAT 2 |
22-Matmo | 2013/08/04 | 2.0 m | Pan | FORMOSAT 2 | 2014/08/25 | 2.0 m | Pan | FORMOSAT 2 |
23-Soudelor | 2015/04/15 | 2.0 m | Pan | FORMOSAT 2 | 2015/09/18 | 2.0 m | Pan | FORMOSAT 2 |
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Wu, CY., Lin, SY. Event-based landslide susceptibility models in Shihmen watershed, Taiwan: accounting for the characteristics of rainfall events. Environ Monit Assess 194, 405 (2022). https://doi.org/10.1007/s10661-022-10075-y
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DOI: https://doi.org/10.1007/s10661-022-10075-y