Adopting the I3–R24 rainfall index and landslide susceptibility for the establishment of an early warning model for rainfall-induced shallow landslides

Wei, Lun-Wei; Huang, Chuen-Ming; Chen, Hongey; Lee, Chyi-Tyi; Chi, Chun-Chi; Chiu, Chen-Lung

doi:10.5194/nhess-18-1717-2018

Articles | Volume 18, issue 6

https://doi.org/10.5194/nhess-18-1717-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Landslide early warning systems: monitoring systems, rainfall...

https://doi.org/10.5194/nhess-18-1717-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 6

Research article

|

20 Jun 2018

Research article |

| 20 Jun 2018

Adopting the I₃–R₂₄ rainfall index and landslide susceptibility for the establishment of an early warning model for rainfall-induced shallow landslides

Lun-Wei Wei, Chuen-Ming Huang, Hongey Chen, Chyi-Tyi Lee, Chun-Chi Chi, and Chen-Lung Chiu

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Jan 2018	67	15	3	85
Feb 2018	54	9	7	70
Mar 2018	26	12	0	38
Apr 2018	15	7	2	24
May 2018	16	7	0	23
Jun 2018	128	63	8	199
Jul 2018	112	42	4	158
Aug 2018	58	30	5	93
Sep 2018	20	23	1	44
Oct 2018	24	25	4	53
Nov 2018	29	25	1	55
Dec 2018	20	17	1	38
Jan 2019	13	10	0	23
Feb 2019	12	12	1	25
Mar 2019	10	15	0	25
Apr 2019	9	9	1	19
May 2019	13	5	0	18
Jun 2019	29	22	0	51
Jul 2019	12	17	0	29
Aug 2019	11	5	1	17
Sep 2019	13	12	2	27
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Nov 2019	10	3	1	14
Dec 2019	16	10	1	27
Jan 2020	12	6	3	21
Feb 2020	9	12	2	23
Mar 2020	9	12	0	21
Apr 2020	14	13	0	27
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Jul 2020	19	23	8	50
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Mar 2021	10	8	0	18
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Jun 2021	15	11	0	26
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Feb 2022	15	5	2	22
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Dec 2022	44	7	0	51
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Jun 2024	21	12	2	35
Jul 2024	25	8	4	37
Aug 2024	22	17	4	43
Sep 2024	12	26	2	40
Oct 2024	26	20	0	46
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Dec 2024	9	14	2	25
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Short summary

The difference in susceptibility might lead to a difference in warning threshold for rainfall-induced landslides. Here we divided slope units into three susceptibility levels and established their thresholds separately. It was found that the threshold values gradually increased as the susceptibility decreased for the same alert level. This showed that classifying susceptibility and establishing thresholds separately might provide refined thresholds for disaster prevention.


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