4:15 PM - 5:00 PM
[O01-02] Challenge in landform change research toward resilient societies
★Invited Papers
Keywords:Anthropocene, land use, complex disaster, earth surface processes, geomorphic system, 2024 Noto Peninsula Earthquake
Associated with the 2024 Noto Peninsula Earthquake (Mw 7.5), shallow sea bottom uplift over 4m to form marine terrace level, tsunami with a maximum wave height of over 5 m to erode or build coastal morphology, over two thousand landslides and debris flows to change slope morphology, and liquefaction and lateral flow of landfills and alluvium occurred simultaneously in wide areas. We can say that such a chain of various landform changes produced the complex disaster. Landform changes killed people and ordinally life, destroyed roads and ports to failure the regional socioeconomic systems. This disaster remind deeply that various kind of landforms chained together change suddenly and abruptly in wide areas on which we live. Landforms of the Noto Peninsular have developed through the interaction between Quaternary uplift, land sliding, fluvial and coastal processes. The large earthquake affected wider areas along the Japan sea coastal region. And the landforms have been changing toward the new equilibrium state while influenced by the earthquake impact.
Considering that the recurrence interval of the same magnitude events may be a few thousand years, we need to know more clearly the past event history by learning the present devastating event as a key to the past. This is mainly because that the past can be a key to understand the future, and the future prediction gives us a key to encouraging behavioral change toward more resilient and sustainable land use and social systems. In such context, the history should consider human acceleration in Anthropocene. Adding to natural landform development, we must understand the composite landforms produced by both anthropogenic and natural agency. Coexistence of pure natural, pure artificial, and artificially induced landforms, and arise of anthropogenic landforms gives new mission and more important meaning to landform change research.
Landforms stand for geodiversity because of their common visibility, and play a role as interface between atmosphere, ocean, and the solid earth systems. And besides, landforms are the ground to support ecosystems and human societies. Thus, knowing the newly appeared landforms in the future after the destruction of the present landforms is the key to design the sustainable and more resilient land use against natural disasters. Field work of real landforms is fascinating, may evoke to think why there are such landforms, and to connect their meaning with multi-time-space Earth systems. Such experience may give new perspective on nature.
In this talk, I would like to introduce, 1) tsunami intrusion through artificially fixed river channels and liquefaction in reclaimed land by 2011 off the Pacific coast of Tohoku Earthquake, 2) slope failure covered with weathering crust, and incomplete avulsion of debris flow channel by 2018 July heavy rainfall, 3) gravel river channel cut and multi river bank destructions by 2019 Typhoon Hagibis, and 4) slope development by landslides triggered by 2024 Noto Peninsula Earthquake. In short, landform change research is changing their main point from traditional scientific discipline to describe solid earth surface morphology to integrated science to research geo-interface between natural earth system and human socioeconomic system. I try to introduce a small part of the challenge to get out of chaos.
Considering that the recurrence interval of the same magnitude events may be a few thousand years, we need to know more clearly the past event history by learning the present devastating event as a key to the past. This is mainly because that the past can be a key to understand the future, and the future prediction gives us a key to encouraging behavioral change toward more resilient and sustainable land use and social systems. In such context, the history should consider human acceleration in Anthropocene. Adding to natural landform development, we must understand the composite landforms produced by both anthropogenic and natural agency. Coexistence of pure natural, pure artificial, and artificially induced landforms, and arise of anthropogenic landforms gives new mission and more important meaning to landform change research.
Landforms stand for geodiversity because of their common visibility, and play a role as interface between atmosphere, ocean, and the solid earth systems. And besides, landforms are the ground to support ecosystems and human societies. Thus, knowing the newly appeared landforms in the future after the destruction of the present landforms is the key to design the sustainable and more resilient land use against natural disasters. Field work of real landforms is fascinating, may evoke to think why there are such landforms, and to connect their meaning with multi-time-space Earth systems. Such experience may give new perspective on nature.
In this talk, I would like to introduce, 1) tsunami intrusion through artificially fixed river channels and liquefaction in reclaimed land by 2011 off the Pacific coast of Tohoku Earthquake, 2) slope failure covered with weathering crust, and incomplete avulsion of debris flow channel by 2018 July heavy rainfall, 3) gravel river channel cut and multi river bank destructions by 2019 Typhoon Hagibis, and 4) slope development by landslides triggered by 2024 Noto Peninsula Earthquake. In short, landform change research is changing their main point from traditional scientific discipline to describe solid earth surface morphology to integrated science to research geo-interface between natural earth system and human socioeconomic system. I try to introduce a small part of the challenge to get out of chaos.