Geomorphological characteristics of mountain slopes with landslides induced by rainfalls after the Iwate-Miyagi nairiku earthquake in 2008

Murakami, Wataru; Daimaru, Hiromu; Kaneko, Morio

doi:10.3313/jls.54.3

Cited by 1 publication

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Section: Evaluation Of the Influence Period Of The Expanding Landslid...mentioning

confidence: 99%

“…Previous studies have often reported that expanding landslides become more pronounced when a landslide caused by an earthquake is subjected to subsequent rainfall [10][11][12][36][37][38][39][40][41]. This is possibly because an earthquake caused cracks around the landslide area; the cracks become lines of weakness and the subsequent rainfall causes landslides [38,41]. In addition, it has been reported that even a small amount of rainfall after an earthquake, approximately 50-70% of the pre-earthquake rainfall, causes the landslide area to expand [10].…”

Section: Evaluation Of the Influence Period Of The Expanding Landslid...mentioning

confidence: 99%

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Time-Series Variation of Landslide Expansion in Areas with a Low Frequency of Heavy Rainfall

Koshimizu,

Uchida

2023

Geosciences

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After multiple simultaneous landslides caused by heavy rainfall, expanding landslides continue to occur for a certain duration. Evaluation of the influencing period of sediment yield due to expanding landslides is vital for comprehensive sediment management of the basin. In this study, we investigated a region with a low frequency of heavy rainfall that has not received its due level of attention until now. Consequently, the transition of expanding landslides depends on the transition of the number of remaining landslides, based on the difference in the frequency of heavy rainfall. Furthermore, the transition of expanding landslides depends on the maximum daily rainfall after the landslides. These findings indicate that “the number of remaining landslides” and “maximum daily rainfall after a landslide” are related factors that determine the period during which expanding landslides frequently occur. An estimation formula based on elapsed time was developed to calculate the number of remaining landslides. An empirical formula for the number of expanding landslides was obtained by multiplying the function of the daily maximum rainfall after the landslide by the estimation formula for the number of remaining landslides. The developed empirical formula can be used effectively for evaluation during periods when rainfall-induced landslides are subject to subsequent expansion.

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Section: Evaluation Of the Influence Period Of The Expanding Landslid...mentioning

confidence: 99%

Section: Evaluation Of the Influence Period Of The Expanding Landslid...mentioning

confidence: 99%

Time-Series Variation of Landslide Expansion in Areas with a Low Frequency of Heavy Rainfall

Koshimizu,

Uchida

2023

Geosciences

View full text Add to dashboard Cite

show abstract

Geomorphological characteristics of mountain slopes with landslides induced by rainfalls after the Iwate-Miyagi nairiku earthquake in 2008

Cited by 1 publication

References 1 publication

Time-Series Variation of Landslide Expansion in Areas with a Low Frequency of Heavy Rainfall

Time-Series Variation of Landslide Expansion in Areas with a Low Frequency of Heavy Rainfall

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