DOI: 10.5194/hess-23-4707-2019
论文题名: Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation
作者: Boehrer B. ; Von Tümpling W. ; Mugisha A. ; Rogemont C. ; Umutoni A.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 11 起始页码: 4707
结束页码: 4716
语种: 英语
Scopus关键词: Carbon dioxide
; Dissolution
; Lakes
; Methane
; Pressure sensors
; Surveys
; Accurate measurement
; Direct measurement
; Dissolved carbon dioxide
; Gas concentration
; Gas pressure sensor
; Measurement accuracy
; Methane concentrations
; Reliable measurement
; Gases
; concentration (composition)
; dissolved gas
; exploitation
; methane
; stratification
; East African Lakes
; Lake Kivu
英文摘要: Dissolved methane in Lake Kivu (East Africa) represents a precious energy deposit for the neighbouring countries, but the high gas loads have also been perceived as a threat by the local population. This is especially the case with respect to potential changes to the lake's stratification during planned industrial exploitation. Both of the above-mentioned issues require accurate and reliable measurements of dissolved gases and temporal changes to take responsible action. Previous data were unable to satisfactorily fulfil these requirements. Prior to our measurements, there was considerable disagreement about prognosticated new formation of methane. We show how measurement accuracy could be significantly improved by implementing equipment that is especially designed and modified for the complex gas conditions in Lake Kivu. Samples were taken from depths of 150 to 430 m to more reliably and more accurately determine the amount of dissolved methane and dissolved carbon dioxide. Beyond the provision of gas concentration profiles at the beginning of exploitation, this investigation can also potentially provide methods to survey the further evolution of gases over time. The use of gas-tight sampling bags produced highly reliable and accurate measurements. Our measurements confirmed the huge amount of stored methane, but clearly did not support the current belief of a significant recharge beyond diffusive loss. Direct measurements with a custom-made gas pressure sensor indicated no imminent danger due to limnic eruptions. However, a further survey of gas pressures is mandatory to detect changing conditions. Using sampling bags and a gas pressure sensor, we introduced reliable and highly accurate measurement approaches for the survey of the further development of gas concentrations. This equipment requires little effort with respect to calibration, which makes it suitable for use in the remote areas of Africa. © 2019 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162854
Appears in Collections: 气候变化与战略
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作者单位: Boehrer, B., Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany; Von Tümpling, W., Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany; Mugisha, A., Lake Kivu Management Program LKMP, Gisenyi, Rwanda; Rogemont, C., Hi-Tech Detection Systems, Massy Cedex, France; Umutoni, A., Lake Kivu Management Program LKMP, Kigali, Rwanda
Recommended Citation:
Boehrer B.,Von Tümpling W.,Mugisha A.,et al. Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation[J]. Hydrology and Earth System Sciences,2019-01-01,23(11)