Multi-event assessment of typhoon-triggered landslide susceptibility in the Philippines
<p>There is a clear need to improve and update landslide susceptibility models across the Philippines. This is challenging, as landslides in this region are frequently triggered by temporally and spatially disparate typhoon events, and it remains unclear whether such spatially and/or temporall...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-03-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | https://nhess.copernicus.org/articles/23/1095/2023/nhess-23-1095-2023.pdf |
| _version_ | 1797870195002310656 |
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| author | J. N. Jones J. N. Jones G. L. Bennett C. Abancó M. A. M. Matera F. J. Tan |
| author_facet | J. N. Jones J. N. Jones G. L. Bennett C. Abancó M. A. M. Matera F. J. Tan |
| author_sort | J. N. Jones |
| collection | DOAJ |
| description | <p>There is a clear need to improve and update landslide susceptibility models across the Philippines. This is challenging, as landslides in this
region are frequently triggered by temporally and spatially disparate typhoon events, and it remains unclear whether such spatially and/or
temporally distinct typhoon events cause similar landslide responses, i.e. whether the landslide susceptibility for one typhoon event is similar
for another. Here, we use logistic regression to develop four landslide susceptibility models based on three typhoon-triggered landslide inventories
for the 2009 Typhoon Parma (local name Typhoon Pepeng), the 2018 Typhoon Mangkhut (local name Typhoon Ompong), and the 2019 Typhoon Kammuri (local
name Typhoon Tisoy). The 2009 and 2018 inventories were mapped across the same 150 <span class="inline-formula">km<sup>2</sup></span> region of Itogon in Benguet Province, whilst the
2019 event was mapped across a 490 <span class="inline-formula">km<sup>2</sup></span> region of Abuan in Isabela Province. The four susceptibility models produced are for the 2009,
2018, and 2019 inventories separately, as well as for the 2009 and 2018 inventories combined. Using the area under the receiver operator curve (AUROC) validation, the accuracy of the models is found to
be 78 %–82 % for the Itogon models and 65 % for the Abuan model. To assess landslide time dependency, we use the AUROC validation and the
Itogon models to quantify the degree to which susceptibility models derived from one event(s) in time can forecast/hindcast the landslides triggered
by another. We find that using a susceptibility model for a typhoon event in one year to forecast/hindcast a typhoon in another leads to a
6 %–10 % reduction in model accuracy compared to the accuracy obtained when modelling and validating each event separately. This suggests
some degree of time dependency in typhoon-triggered landslides in the Philippines. However, using a susceptibility model for two combined typhoon
events (2018 <span class="inline-formula">+</span> 2009) to forecast/hindcast each typhoon event separately led to just a 1 %–3 % reduction in model accuracy. This
suggests that combined multi-event typhoon-triggered landslide susceptibility models will be more accurate and reliable for the forecasting of
future typhoon-triggered landslides. Finally, by undertaking a high-level comparison of the Abuan and Itogon susceptibility models through space, we
preliminarily suggest that there may be spatial dependency in typhoon-triggered landslides in the Philippines but that further work into issues of spatial dependency in this region is required.</p> |
| first_indexed | 2024-04-10T00:24:33Z |
| format | Article |
| id | doaj.art-b1257e6f5b204b03b2b3d1c5a6c84742 |
| institution | Directory Open Access Journal |
| issn | 1561-8633 1684-9981 |
| language | English |
| last_indexed | 2024-04-10T00:24:33Z |
| publishDate | 2023-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj.art-b1257e6f5b204b03b2b3d1c5a6c847422023-03-15T12:59:11ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812023-03-01231095111510.5194/nhess-23-1095-2023Multi-event assessment of typhoon-triggered landslide susceptibility in the PhilippinesJ. N. Jones0J. N. Jones1G. L. Bennett2C. Abancó3M. A. M. Matera4F. J. Tan5AECOM, East Wing Plumer House, Plymouth, PL6 5DH, United KingdomCollege of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, United KingdomCollege of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, United KingdomFaculty of Earth Sciences, University of Barcelona, 08028 Barcelona, SpainSchool of Civil, Environmental and Geological Engineering, Mapúa University, Manila, PhilippinesSchool of Civil, Environmental and Geological Engineering, Mapúa University, Manila, Philippines<p>There is a clear need to improve and update landslide susceptibility models across the Philippines. This is challenging, as landslides in this region are frequently triggered by temporally and spatially disparate typhoon events, and it remains unclear whether such spatially and/or temporally distinct typhoon events cause similar landslide responses, i.e. whether the landslide susceptibility for one typhoon event is similar for another. Here, we use logistic regression to develop four landslide susceptibility models based on three typhoon-triggered landslide inventories for the 2009 Typhoon Parma (local name Typhoon Pepeng), the 2018 Typhoon Mangkhut (local name Typhoon Ompong), and the 2019 Typhoon Kammuri (local name Typhoon Tisoy). The 2009 and 2018 inventories were mapped across the same 150 <span class="inline-formula">km<sup>2</sup></span> region of Itogon in Benguet Province, whilst the 2019 event was mapped across a 490 <span class="inline-formula">km<sup>2</sup></span> region of Abuan in Isabela Province. The four susceptibility models produced are for the 2009, 2018, and 2019 inventories separately, as well as for the 2009 and 2018 inventories combined. Using the area under the receiver operator curve (AUROC) validation, the accuracy of the models is found to be 78 %–82 % for the Itogon models and 65 % for the Abuan model. To assess landslide time dependency, we use the AUROC validation and the Itogon models to quantify the degree to which susceptibility models derived from one event(s) in time can forecast/hindcast the landslides triggered by another. We find that using a susceptibility model for a typhoon event in one year to forecast/hindcast a typhoon in another leads to a 6 %–10 % reduction in model accuracy compared to the accuracy obtained when modelling and validating each event separately. This suggests some degree of time dependency in typhoon-triggered landslides in the Philippines. However, using a susceptibility model for two combined typhoon events (2018 <span class="inline-formula">+</span> 2009) to forecast/hindcast each typhoon event separately led to just a 1 %–3 % reduction in model accuracy. This suggests that combined multi-event typhoon-triggered landslide susceptibility models will be more accurate and reliable for the forecasting of future typhoon-triggered landslides. Finally, by undertaking a high-level comparison of the Abuan and Itogon susceptibility models through space, we preliminarily suggest that there may be spatial dependency in typhoon-triggered landslides in the Philippines but that further work into issues of spatial dependency in this region is required.</p>https://nhess.copernicus.org/articles/23/1095/2023/nhess-23-1095-2023.pdf |
| spellingShingle | J. N. Jones J. N. Jones G. L. Bennett C. Abancó M. A. M. Matera F. J. Tan Multi-event assessment of typhoon-triggered landslide susceptibility in the Philippines Natural Hazards and Earth System Sciences |
| title | Multi-event assessment of typhoon-triggered landslide susceptibility in the Philippines |
| title_full | Multi-event assessment of typhoon-triggered landslide susceptibility in the Philippines |
| title_fullStr | Multi-event assessment of typhoon-triggered landslide susceptibility in the Philippines |
| title_full_unstemmed | Multi-event assessment of typhoon-triggered landslide susceptibility in the Philippines |
| title_short | Multi-event assessment of typhoon-triggered landslide susceptibility in the Philippines |
| title_sort | multi event assessment of typhoon triggered landslide susceptibility in the philippines |
| url | https://nhess.copernicus.org/articles/23/1095/2023/nhess-23-1095-2023.pdf |
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