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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Numerical assessment of the potential for future limnic eruptions at lakes Nyos and Monoun, Cameroon, based on regular monitoring data
Geological Society Special Publication, Volume 437, No. 1, Year 2017
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Description
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. © 2017 The Author(s).
Authors & Co-Authors
Kusakabe, Minoru
Japan, Toyama
University of Toyama
Yoshida, Yutaka
Japan, Morioka
Yoshida Consulting Engineer Office
Ntchantcho, Romaric
Cameroon, Yaounde
Institute of Research for Geology and Mining
Ohba, Takeshi
Japan, Tokyo
Tokai University
Tanyileke, Gregory Z.
Cameroon, Yaounde
Institute of Research for Geology and Mining
Hell, Joseph Victor
Cameroon, Yaounde
Institute of Research for Geology and Mining
Statistics
Citations: 6
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1144/SP437.8
ISSN:
03058719
Study Approach
Qualitative
Study Locations
Cameroon