open access

https://hdl.handle.net/2115/97225

Role of road network for prevention and mitigation of runoff-induced geo-disaster under climate change

英語

Coupled analysis

2024-07

Elsevier

Transportation geotechnics

47

101283

Under the climate change in recent years, heavy rainfalls that break observation records almost every year around the world have caused various geo-disasters. In particular, the frequent occurrence of torrential rainfall induced geo-disasters is accompanied by an increase in water-soil complex disasters caused by surface and seepage flows. For example, it has been reported in Japan that a large amount of rainwater, which cannot infiltrate into the soil ground, flows down the paved surface as a water channel, eroding and collapsing the natural slopes, embankments and cut slopes at the downstream. The Intergovernmental Panel on Climate Change (IPCC) forecasts that both the frequency of torrential rainfall and the amount of rainfall will continue to increase as extreme weather events become more frequent in the future. For this reason, there is a high possibility that record-breaking torrential rainfall will be observed, and that slope disasters at the unexpected locations along roads, which differ from the conventional mechanisms of slope failures, will emerge due to surface and seepage flows. Therefore, this study introduces a wide-area slope stability analysis considering rainfall infiltration and runoff useful for the risk assessment of water-soil complex landslide disasters with torrential rainfalls, which are expected to increase in various parts of the world in the future. In the end, based on case studies of actual geodisasters with the proposed analysis, this study clarifies the perspectives necessary for the risk assessment of transportation infrastructures such as a road pavement, which is the outflow path of surface flow, and the disaster prevention and mitigation measures, and explain the role of road network as a linear structure under the climate change.

学術雑誌論文

Accepted Manuscript

Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

© <2024>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

2214-3912