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Final step of the 32-year Lake Nyos degassing adventure: Natural CO2 recharge is to be balanced by discharge through the degassing pipes
Journal of African Earth Sciences ( IF 2.3 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jafrearsci.2019.103575
Michel Halbwachs , Jean-Christophe Sabroux , Gaston Kayser

Abstract In wake of the lakes Monoun and Nyos disasters, the aim of the Nyos Organ Pipes Program was clearly to mitigate the hazard of a limnic eruption at both lakes in the coming decades. Due to the carbon dioxide natural recharge of the Nyos lake water, the self-siphon degassing pipes had been progressively scaled up since 1992 in order to liberate most of the CO2 content of the lake in a reasonable time. One of the pipes was also fine-tuned to exactly counterbalance for the CO2 recharge on the long term. In less than thirty years, both objectives have been met by a team of French scientists, engineers and technicians. Here we show that the continuous operation of no more than a single degassing pipe, as already installed in Lake Nyos since 2001 and refurbished in 2011, could match the natural CO2 recharge rate. The safeguarding, without any human intervention, of a visible water jet, equally feasible at Lake Monoun, will sustain the awareness of scientists and institutions in charge, and will perpetuate their commitment to decrease the risk of a new disaster among the Nyos and Monoun lakeside residents.

中文翻译:

32 年尼奥斯湖脱气冒险的最后一步:通过脱气管道排放来平衡自然二氧化碳补给

摘要 在莫诺恩湖和尼奥斯湖灾难之后,尼奥斯器官管计划的目标显然是在未来几十年减轻这两个湖泊的湖泊喷发的危险。由于 Nyos 湖水的二氧化碳自然补给,自 1992 年以来,自虹吸脱气管道逐步扩大规模,以便在合理的时间内释放湖中的大部分 CO2 含量。其中一根管道也进行了微调,以精确平衡长期二氧化碳补给。在不到三十年的时间里,一个由法国科学家、工程师和技术人员组成的团队实现了这两个目标。在这里,我们表明,自 2001 年以来已经在尼奥斯湖安装并在 2011 年翻新的不超过一根脱气管的连续运行可以与自然二氧化碳补给率相匹配。保障,
更新日期:2020-07-01
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