Inside pyroclastic density currents - uncovering the enigmatic flow structure and transport behaviour in large-scale experiments

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• 作者：Eric C.P. Breard ; ^{E.C.P.Breard@massey.ac.nz} ; Gert Lube
• 关键词：pyroclastic density currents ; gravity currents ; turbidity currents ; dynamic pressure ; gas&ndash ; particle coupling ; Kelvin&ndash ; Helmholtz instability ; volcanic hazards
• 刊名：Earth and Planetary Science Letters
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：458
• 期：Complete
• 页码：22-36
• 全文大小：4740 K
• 卷排序：458

文摘

First measurements of velocity and density fields in high-density gravity currents. Strong traction between non-turbulent base and turbulent top controls stratification. This traction causes forced super-criticality of ash-cloud surge enhancing damage. Turbulent gas–particle transport spans homogeneously coupled to decoupled regimes. Successive peaks in dynamic pressure in ash-cloud surge increase PDC damage potential.