Investigating the Accuracy of One‐Dimensional Volcanic Plume Models using Laboratory Experiments and Field Data
Investigating the Accuracy of One‐Dimensional Volcanic Plume Models using Laboratory Experiments and Field Data
复制标题
使用实验室实验和现场数据研究一维火山羽流模型的准确性
DOI:
10.1029/2018jb017224
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Solovitz, Stephen A.
中科院分区:
文献类型:
--
作者:
McNeal, James S.;Freedland, Graham;Mastin, Larry G.;Cal, Raúl Bayoán;Solovitz, Stephen A.
During volcanic eruptions, model predictions of plume height are limited by the accuracy of entrainment coefficients used in many plume models. Typically, two parameters are used,αandβ, which relate the entrained air speed to the jet speed in the axial and cross‐flow directions, respectively. To improve estimates of these parameters, wind tunnel experiments have been conducted for a range of cross‐wind velocities and turbulence conditions. Measurements are compared directly to computations from the 1‐D plume model, Plumeria, in the near‐field, bending region of the jet. Entrainment coefficients are determined through regression analysis, demonstrating optimal combinations of effectiveαandβvalues. For turbulent conditions, all wind speeds overlapped at a single combination,α= 0.06 andβ=0.46, each of which are slightly reduced from standard values. Refined coefficients were used to model plume heights for 20 historical eruptions. Model accuracy improves modestly in most cases, agreeing to within 3 km with observed plume heights. For weak eruptions, uncertainty in field measurements can outweigh the effects of these refinements, illustrating the challenge of applying plume models in practice.
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DOI:
10.1002/2016jd025344
发表时间:
2016-09-27
期刊:
Journal of geophysical research. Atmospheres : JGR
影响因子:
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作者:
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作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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