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

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY Geosciences (Switzerland) Pub Date : 2023-10-18 DOI:10.3390/geosciences13100314
Ken’ichi Koshimizu, Taro Uchida
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Abstract

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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低频率强降雨地区滑坡扩展的时间序列变化
强降雨引起多处滑坡同时发生后,在一定时间内继续发生扩大滑坡。滑坡扩展产沙影响期的评价对流域的综合治沙具有重要意义。在这项研究中,我们调查了一个低频强降雨地区,直到现在还没有得到应有的重视。因此,滑坡扩展的过渡取决于剩余滑坡数量的过渡,基于强降雨频率的差异。此外,滑坡扩展的过渡取决于滑坡发生后的最大日降雨量。这些结果表明,“剩余滑坡数量”和“滑坡后最大日降雨量”是决定扩大型滑坡多发期的相关因素。建立了一个基于时间的估算公式来计算剩余滑坡的数量。将滑坡发生后日最大降雨量函数与剩余滑坡数估算公式相乘,得到滑坡扩展数的经验公式。所建立的经验公式可以有效地用于降雨诱发滑坡后续扩展时期的评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geosciences (Switzerland)
Geosciences (Switzerland) Earth and Planetary Sciences-Earth and Planetary Sciences (all)
CiteScore
5.30
自引率
7.40%
发文量
395
审稿时长
11 weeks
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