Vertical profiles of velocity and suspended sediment in streams near Mount St. Helens, Washington

1987 ◽  
Author(s):  
R.L. Dinehart
Keyword(s):  
Suspended Sediment ◽  
Vertical Profiles ◽  
Mount St Helens

scholarly journals Properties of Debris-Laden Ice: Application to the Flow Response of the Glaciers on Mount St Helens

1983 ◽  
Vol 4 ◽  
pp. 297 ◽  
Author(s):  
Melinda M. Brugman
Keyword(s):  
Flow Behavior ◽  
Transverse Velocity ◽  
Plug Flow ◽  
Sudden Change ◽  
Velocity Profiles ◽  
Pyroclastic Flows ◽  
Surface Velocity ◽  
Vertical Profiles ◽  
Glacier Surface ◽  
Mount St Helens

Intense deformation within an extensive englacial debris layer appears to be a dominant flow mechanism for glaciers on Mount St Helens, Washington. Observations of this phenomenon have been made on Shoestring Glacier and more recently on other glaciers on the volcano. Transverse velocity profiles on Shoestring Glacier have shown a marked plug flow behavior occurring between narrow marginal zones of crevassing. Both longitudinal and transverse velocity profiles on Shoestring Glacier were measured during the year before and the two years after the cataclysmic eruption of the volcano on 18 May 1980. The geometry and regime of every glacier on Mount St Helens dramatically changed during the eruption. The entire accumulation area of Shoestring Glacier was removed by a volcanic landslide and blast, and the glacier surface was deeply incised through the action of pyroclastic flows and mudflows. Surface velocity measurements were supplemented by vertical profiles taken along the newly exposed ice cliffs. Large velocity gradients seen in the transverse, longitudinal and vertical profiles coincided with the mapped location of a recently exposed englacial debris layer. Further detailed measurements on the vertical profiles show that the intense shear occurs by deformation internal to the debris layer, A study of the properties of debris-laden ice was undertaken to determine the mechanism for localization of deformation to the debris layer and for the associated response of the glacier to a sudden change in stress.

scholarly journals Properties of Debris-Laden Ice: Application to the Flow Response of the Glaciers on Mount St Helens

1983 ◽  
Vol 4 ◽  
pp. 297-297 ◽  
Author(s):  
Melinda M. Brugman
Keyword(s):  
Flow Behavior ◽  
Transverse Velocity ◽  
Plug Flow ◽  
Sudden Change ◽  
Velocity Profiles ◽  
Pyroclastic Flows ◽  
Surface Velocity ◽  
Vertical Profiles ◽  
Glacier Surface ◽  
Mount St Helens

Intense deformation within an extensive englacial debris layer appears to be a dominant flow mechanism for glaciers on Mount St Helens, Washington. Observations of this phenomenon have been made on Shoestring Glacier and more recently on other glaciers on the volcano. Transverse velocity profiles on Shoestring Glacier have shown a marked plug flow behavior occurring between narrow marginal zones of crevassing. Both longitudinal and transverse velocity profiles on Shoestring Glacier were measured during the year before and the two years after the cataclysmic eruption of the volcano on 18 May 1980.The geometry and regime of every glacier on Mount St Helens dramatically changed during the eruption. The entire accumulation area of Shoestring Glacier was removed by a volcanic landslide and blast, and the glacier surface was deeply incised through the action of pyroclastic flows and mudflows. Surface velocity measurements were supplemented by vertical profiles taken along the newly exposed ice cliffs. Large velocity gradients seen in the transverse, longitudinal and vertical profiles coincided with the mapped location of a recently exposed englacial debris layer. Further detailed measurements on the vertical profiles show that the intense shear occurs by deformation internal to the debris layer, A study of the properties of debris-laden ice was undertaken to determine the mechanism for localization of deformation to the debris layer and for the associated response of the glacier to a sudden change in stress.

Observed Suspended Sediment Profiles under the Effect of Single and Double Peaked Wave Spectra

2006 ◽  
Author(s):  
M. R. Delgado Blanco ◽  
M. Olabarrieta Lizaso ◽  
A. Giardino ◽  
R. Banasiak ◽  
R. Verhoeven ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Wave Spectra ◽  
Sediment Profiles
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