'Giant volcanic intrusions' by Herbert Huppert (DAMTP, Cambridge)

Duration: 44 mins 56 secs

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Description:	Talk given by Prof Herbert Huppert (Department of Applied Mathematics & Theoretical Physics, University of Cambridge) at Department of Engineering, University of Cambridge, 25 November 2016, as part of the CUED Fluids seminar series. The talk discusses models of the horizontal intrusion of a volcanic plume that has reached the height of neutral density in a stratified atmosphere, including the effects of drag and wind. The rate of lateral spreading with downstream distance is also considered.

Description:

Talk given by Prof Herbert Huppert (Department of Applied Mathematics & Theoretical Physics, University of Cambridge) at Department of Engineering, University of Cambridge, 25 November 2016, as part of the CUED Fluids seminar series.

The talk discusses models of the horizontal intrusion of a volcanic plume that has reached the height of neutral density in a stratified atmosphere, including the effects of drag and wind. The rate of lateral spreading with downstream distance is also considered.


Created:	2016-11-28 14:45
Collection:	Cambridge Engineering Dept Fluids Seminars
Publisher:	University of Cambridge
Copyright:	Herbert Huppert
Language:	eng (English)
Keywords:	Volcanic eruption; Volcanic plume; plume; intrusion; stratified atmosphere;


Abstract:	I would present a brief description of a volcanic eruption, the formation of a volcanic plume and its intrusion at the height of neutral density into the stratified atmosphere; the intrusion rate determined by balance of forces, by balance of terms in the governing equations and by a similarity form of solution, all of which agree, but are, unfortunately, incorrect! I will go on to develop the correct, quite different, solution and account for the extra effects of drag and wind. I will end with an observational graph, which I like, but some others don’t, collapsing the data for spread as a function of downstream distance, an aspect I am still working on.

Abstract:

I would present a brief description of a volcanic eruption, the formation of a volcanic plume and its intrusion at the height of neutral density into the stratified atmosphere; the intrusion rate determined by balance of forces, by balance of terms in the governing equations and by a similarity form of solution, all of which agree, but are, unfortunately, incorrect! I will go on to develop the correct, quite different, solution and account for the extra effects of drag and wind. I will end with an observational graph, which I like, but some others don’t, collapsing the data for spread as a function of downstream distance, an aspect I am still working on.

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