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  1. 防災科研関係論文

Numerical assessment of the potential for future limnic eruptions at lakes Nyos and Monoun, Cameroon, based on regular monitoring data

https://nied-repo.bosai.go.jp/records/3935
https://nied-repo.bosai.go.jp/records/3935
79275519-38f3-48a7-ab89-6b4d268adbb9
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 ja
タイトル Numerical assessment of the potential for future limnic eruptions at lakes Nyos and Monoun, Cameroon, based on regular monitoring data
タイトル
言語 en
タイトル Numerical assessment of the potential for future limnic eruptions at lakes Nyos and Monoun, Cameroon, based on regular monitoring data
言語
言語 eng
著者 T. Kozono

× T. Kozono

ja T. Kozono

en T. Kozono.

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M. Kusakabe

× M. Kusakabe

ja M. Kusakabe

en M. Kusakabe

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Y. Yoshida

× Y. Yoshida

ja Y. Yoshida

en Y. Yoshida

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R. Ntchantcho

× R. Ntchantcho

ja R. Ntchantcho

en R. Ntchantcho

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T. Ohba

× T. Ohba

ja T. Ohba

en T. Ohba

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G. Tanyileke

× G. Tanyileke

ja G. Tanyileke

en G. Tanyileke

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J. V. Hell

× J. V. Hell

ja J. V. Hell

en J. V. Hell

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抄録
内容記述タイプ Other
内容記述 We assessed the potential for limnic eruptions at lakes Nyos and Monoun, Cameroon on the basis of numerical modelling and CO2 profiles obtained by regular monitoring of the lakes. The change through time of the profiles suggests one particular scenario for producing an eruption: a supply of CO2-undersaturated fluid from the lake bottom that induces upwards growth of the CO2-rich bottom layer, leading eventually to CO2 saturation at mid-depths of the lake. By using a numerical model for the ascent of a plume of CO2 bubbles, we found that under realistic conditions (e.g. a profile of CO2 as deduced from the regular monitoring data), a bubble plume generated from the middle depths of the lake can reach the lake surface with a high flux of CO2, which corresponds to a limnic eruption. In addition, we developed a numerical model to investigate how changes in the CO2 concentration at the lake bottom affect the dynamics of a two-phase flow in the controlled degassing pipe, using the recently observed CO2 profiles. This model enables us to estimate the CO2 concentrations at the lake bottom from the heights of fountains that are observable at the lake surface.
言語 en
書誌情報 en : Geological Society, London, Special Publication

巻 437, 号 1, p. 163-175, 発行日 2017-07
出版者
言語 en
出版者 Geological Society of London
ISSN
収録物識別子タイプ ISSN
収録物識別子 0305-8719
DOI
関連識別子 10.5194/nhess-17-861-2017
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