Characteristics of sediment dynamics following large-scale sediment supply events in mountain watersheds in Japan

Izumiyama, Hiroaki; Uchida, Tatsuo; Horie, Katsuya; Sakurai, Wataru

doi:10.1016/j.geomorph.2020.107301

Cited by 2 publications

(1 citation statement)

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“…In particular, when earthquakes and heavy rainfall cause multiple simultaneous landslides, sediment runoff occurs downstream over a longer duration [1][2][3], causing damage to houses and infrastructure in downstream areas. Therefore, it is vital to understand sediment dynamics as a sediment transport system after large-scale sediment supply events, such as earthquakes or heavy rainfall [4].…”

Section: Introductionmentioning

confidence: 99%

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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