共查询到20条相似文献，搜索用时 15 毫秒
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《Journal of Volcanology and Geothermal Research》1999,88(4):343-347
The catastrophic release of carbon dioxide gas from Lake Nyos on 21 August 1986 is discussed in the context of the buoyancy reversal instability. Originally proposed by Randall (1980) [Randall, D.S., 1980. Conditional instability of the first kind upside-down. Journal of Atmospheric Sciences 37: 125–130.] and Deardoff (1980) [Deardoff, J.W., 1980. Cloud-top entrainment instability. Journal of Atmospheric Sciences 37: 131–147.] for the `cloud-top entrainment instability' of stratocumulus clouds, the buoyancy reversal instability has been studied experimentally in water tank experiments by Shy and Breidenthal (1990) [Shy, S.S., Breidenthal, R.E., 1990. Laboratory experiments on the cloud-top entrainment instability. Journal of Fluid Mechanics 214: 1–15.], who identified three criteria for instability. The initial disturbance must be sufficiently large, so that its Reynolds number is above the mixing transition, its Richardson number must be less than one to achieve overturning and mixing, and the buoyancy reversal parameter must be greater than a critical value, of order one. The implications and applicability of these criteria to Lake Nyos are discussed. The criterion for the Reynolds number is easily satisfied for typical wind velocities in the Lake Nyos region. Similarly, the Richardson number based on incident turbulence is easily less than unity, and therefore satisfy the second criterion for instability. In the case of Lake Nyos, the continuous release of carbon dioxide at the bottom of the lake increases the value of the buoyancy reversal parameter until it reaches its critical value, at which point an explosion occurs. This instability provides a plausible trigger for the 1986 explosion. After each explosion, the buoyancy reversal parameter returns to below its critical value, only to slowly rise again over time, as CO2 continues to enter the lake, setting the stage for the next explosion. Future explosions may be avoided if the value of the buoyancy reversal parameter is prevented from approaching its critical value by artificial mixing at the thermocline, such as with a bubble plume. 相似文献
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Gosselin Jeremy M. Dosso Stan E. Askan Aysegul Wathelet Marc Savvaidis Alexandros Cassidy John F. 《Journal of Seismology》2022,26(4):781-821
Journal of Seismology - Seismic site characterization attempts to quantify seismic wave behavior at a specific location based on near-surface geophysical properties, for the purpose of mitigating... 相似文献
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基于中国知网的《灾害学》网络传播统计分析 总被引：3，自引：0，他引：3
根据中国知网中《灾害学》的网络传播统计数据,对《灾害学》2005至2009年1月的浏览、下载情况以及在世界各地区、各学科、各研究单位的传播情况进行了统计分析,认为《灾害学》目前在一些知名高校具有一定的影响力,《灾害学》多登载的一些与社会热点灾害问题相关的研究论文对提高《灾害学》的社会影响力有积极的作用。 相似文献
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Pignatelli Alessandro D’Ajello Caracciolo Francesca Console Rodolfo 《Journal of Seismology》2021,25(6):1347-1359
Journal of Seismology - Analyzing seismic data to get information about earthquakes has always been a major task for seismologists and, more in general, for geophysicists. Recently, thanks to the... 相似文献
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Journal of Seismology - The sine calibration can be used for measuring the phase response of a seismometer. However, it has two shortcomings: (1) Transient responses that cannot be used for data... 相似文献
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Journal of Seismology - The geotechnical industry has widely adopted the refraction microtremor shear-wave velocity measurement technique, which is accepted by building authorities for evaluation... 相似文献
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A new methodology for water resources multicriteria decision making under uncertainty 总被引：1，自引：0，他引：1
A multiciteria decision making problem in water resource is addressed through the generation of fuzzy Pareto optimal set. Methodology is using positive and negative ideal solutions (Lai, Y.-J., Liu, T.-Y., Hwang, C.L. (1994). TOPSIS for MODM. European Journal of Operational Research 76, 486-500) and a set of weights assigned to the objective functions in fuzzy triangular form. Solution of the problem is obtained by transforming each objective function into a set of three objective functions. A planning problem of multicriteria waste water treatment from the literature is used as an illustrative example to demonstrate the utility of the proposed methodology. The obtained fuzzy Pareto solution set has been compared with the deterministic solution set. It is shown that the proposed approach can: (a) capture the uncertainty associated with the assignment of weights; and (b) provide the decision makers with a wider range of solutions to select from. 相似文献
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《Astronomy& Geophysics》2010,51(1):1.39-1.39
Geophysical Journal International has announced the winners of its 2009 Student Author Awards for the best papers in the field with young scientists as lead authors. 相似文献
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应用文献计量方法，对《湖泊科学》１９８９￣１９９５年出版的２０期所刊２４３篇论文进行统计分析，包括论文分类统计、作者分析、基金论文统计分析等。在分析基础上阐述湖泊科学发展现状以及为期刊编辑、文献工作者提供一个量化的衡量工作的依据。 相似文献
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Parolai Stefano Lai Carlo G. Dreossi Ilaria Ktenidou Olga-Joan Yong Alan 《Journal of Seismology》2022,26(4):823-862
Journal of Seismology - Seismic attenuation and the associated quality factor (Q) have long been studied in various sub-disciplines of seismology, ranging from observational and engineering... 相似文献
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Molnar S. Sirohey A. Assaf J. Bard P.-Y. Castellaro S. Cornou C. Cox B. Guillier B. Hassani B. Kawase H. Matsushima S. Sánchez-Sesma F. J. Yong A. 《Journal of Seismology》2022,26(4):653-685
Journal of Seismology - The single-station microtremor horizontal-to-vertical spectral ratio (MHVSR) method was initially proposed to retrieve the site amplification function and its resonance... 相似文献
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Journal of Seismology - We estimated the S-wave quality factor Q(f) of the upper crust in northeastern Sonora, Mexico, using a two-layer model. The first layer of the model has a thickness of 1 km,... 相似文献
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《地球物理与天体物理流体动力学》2013,107(1-4):336-338
Abstract Special Number of the Journal de Mécanique with an editorial by R. Moreau. Gauthier-Villars Publishers, 292 pp. FF 162 (ISBN 2-04-011785-7) 1983. 相似文献
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Journal of Seismology - In the Kanto Basin, Japan, it has been reported that the dominant periods of long-period ground motions vary depending on the areas where earthquakes occurred. This suggests... 相似文献
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《Journal of Atmospheric and Solar》2002,64(4):443-450
This article has been retracted at the request of the editor.Reason: The publisher regrets that several errors appeared in this paper and that it therefore has been retracted. A correct version of the complete paper has been published in Volume 64, Issue 7, pages 863–870 of the Journal of Atmospheric and Solar-Terrestrial Physics. 相似文献
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Ａ ｄｏｃｕｍｅｎｔａｌ ｄａｔａｂａｓｅ ｏｆ Ｐａｐｅｒｓ ｉｎ Ｃｈｉｎｅｓｅ Ｓｅｉｓｍｏｌｏｇｉｃａｌ Ｊｏｕｒｎａｌｓ （Ｅｎｇｌｉｓｈｅｄｉｔｉｏｎ）（高树心）（￥宋利萍）ＡｄｏｃｕｍｅｎｔａｌｄａｔａｂａｓｅｏｆＰａｐｅｒｓｉｎＣｈｉ... 相似文献
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Journal of Seismology - The aftershocks of the 2015 Mw7.8 Gorkha Nepal earthquake extend up to 130km to the east of the epicenter. The distribution suggests that the rupture has propagated from... 相似文献
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本文对董良国、马在田等人发表在<地球物理学报>上的一阶弹性波方程交错网格高阶差分解法一文进行了差分格式的改进.发现原文对一阶空间导数采用2N阶差分精度,而对高阶导数却采用简单的中心差分,即对同一方程中的各阶导数的处理存在有的采用高阶格式、有的采用低阶格式的不一致性问题,本文的改进点正是消除了这种不一致性,建立了时间和空间均为四阶精度的差分格式.该方法具有编程简便、易于计算机实现和精度较高的特点. 相似文献