Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain Disasters
In this study, we use GIS and other analytical platforms to analyze the landslide distribution pattern in the July 2018 heavy rain disasters in the southern part of Hiroshima Prefecture in Japan in conjunction with chronological XRAIN (eXtended Radar Information Network) radar-acquired localized rai...
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| Format: | Article |
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MDPI AG
2023-08-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/13/8/245 |
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| author | José Maria dos Santos Rodrigues Neto Netra Prakash Bhandary |
| author_facet | José Maria dos Santos Rodrigues Neto Netra Prakash Bhandary |
| author_sort | José Maria dos Santos Rodrigues Neto |
| collection | DOAJ |
| description | In this study, we use GIS and other analytical platforms to analyze the landslide distribution pattern in the July 2018 heavy rain disasters in the southern part of Hiroshima Prefecture in Japan in conjunction with chronological XRAIN (eXtended Radar Information Network) radar-acquired localized rainfall data in order to better understand the relationship between rainfall characteristics and landslide probability. An analysis of event rainfall from the July 2018 disasters determines that landslide-inducing rainfall started from 8:30 AM on 5 July and continued until 7:30 AM on 7 July, accumulating to up to 368 mm in total precipitation, and that there were two intensity peaks, one around 7:30 PM on 6 July, and another one around 4:30 AM on 7 July. These two events are associated with particularly high landslide activity, which indicates that landslide activation is related to peak-intensity rainfall combined with accumulated continuous precipitation. The XRAIN data were also used together with landslide reports to calculate the intensity–duration (i.e., <i>I</i>-<i>D</i>) rainfall threshold for the area. The mean annual precipitation in the whole study area ranged between 2025 mm and 3030 mm, with an average value of about 2300 mm. The spatial distribution of rainfall throughout the sampled years indicates that rainfall is remarkably localized, with higher values concentrated on elevated areas. However, it was also observed that the maximum precipitation volumes are not so closely related to landslide occurrence, and the highest landslide activity was found in intermediate precipitation class zones instead. Correlating the localization patterns of event precipitation and mean annual precipitation using Pearson’s correlation coefficient, we found an <i>r</i> value of 0.55, which is considered a moderate correlation between the two datasets (i.e., event precipitation and mean annual precipitation). |
| first_indexed | 2024-03-10T23:54:03Z |
| format | Article |
| id | doaj.art-1c195dba56954c9f8f3861addfc978cf |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-10T23:54:03Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-1c195dba56954c9f8f3861addfc978cf2023-11-19T01:17:11ZengMDPI AGGeosciences2076-32632023-08-0113824510.3390/geosciences13080245Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain DisastersJosé Maria dos Santos Rodrigues Neto0Netra Prakash Bhandary1Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, JapanFaculty of Collaborative Regional Innovation, Ehime University, Matsuyama 790-8577, JapanIn this study, we use GIS and other analytical platforms to analyze the landslide distribution pattern in the July 2018 heavy rain disasters in the southern part of Hiroshima Prefecture in Japan in conjunction with chronological XRAIN (eXtended Radar Information Network) radar-acquired localized rainfall data in order to better understand the relationship between rainfall characteristics and landslide probability. An analysis of event rainfall from the July 2018 disasters determines that landslide-inducing rainfall started from 8:30 AM on 5 July and continued until 7:30 AM on 7 July, accumulating to up to 368 mm in total precipitation, and that there were two intensity peaks, one around 7:30 PM on 6 July, and another one around 4:30 AM on 7 July. These two events are associated with particularly high landslide activity, which indicates that landslide activation is related to peak-intensity rainfall combined with accumulated continuous precipitation. The XRAIN data were also used together with landslide reports to calculate the intensity–duration (i.e., <i>I</i>-<i>D</i>) rainfall threshold for the area. The mean annual precipitation in the whole study area ranged between 2025 mm and 3030 mm, with an average value of about 2300 mm. The spatial distribution of rainfall throughout the sampled years indicates that rainfall is remarkably localized, with higher values concentrated on elevated areas. However, it was also observed that the maximum precipitation volumes are not so closely related to landslide occurrence, and the highest landslide activity was found in intermediate precipitation class zones instead. Correlating the localization patterns of event precipitation and mean annual precipitation using Pearson’s correlation coefficient, we found an <i>r</i> value of 0.55, which is considered a moderate correlation between the two datasets (i.e., event precipitation and mean annual precipitation).https://www.mdpi.com/2076-3263/13/8/245the July 2018 heavy rain disasterslandslidessouthern HiroshimaXRAIN datarainfall patternrainfall threshold |
| spellingShingle | José Maria dos Santos Rodrigues Neto Netra Prakash Bhandary Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain Disasters Geosciences the July 2018 heavy rain disasters landslides southern Hiroshima XRAIN data rainfall pattern rainfall threshold |
| title | Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain Disasters |
| title_full | Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain Disasters |
| title_fullStr | Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain Disasters |
| title_full_unstemmed | Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain Disasters |
| title_short | Influence of Localized Rainfall Patterns on Landslide Occurrence—A Case Study of Southern Hiroshima with eXtended Radar Information Network Data during the July 2018 Heavy Rain Disasters |
| title_sort | influence of localized rainfall patterns on landslide occurrence a case study of southern hiroshima with extended radar information network data during the july 2018 heavy rain disasters |
| topic | the July 2018 heavy rain disasters landslides southern Hiroshima XRAIN data rainfall pattern rainfall threshold |
| url | https://www.mdpi.com/2076-3263/13/8/245 |
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