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Debris flow initiation conditions on...

Callaghan, Carol J.

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Debris flow initiation conditions on Mount Shasta, California.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Debris flow initiation conditions on Mount Shasta, California./
作者:	Callaghan, Carol J.
面頁冊數:	108 p.
附註:	Adviser: James R. Carr.
Contained By:	Masters Abstracts International38-06.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1399553
ISBN:	9780599772779

Debris flow initiation conditions on Mount Shasta, California.
Callaghan, Carol J.

Debris flow initiation conditions on Mount Shasta, California. - 108 p.

Adviser: James R. Carr.

Thesis (M.S.)--University of Nevada, Reno, 2000.

Mount Shasta has experienced frequent, extensive debris flow events throughout its history. Over the last century, the largest events have been documented to occur during warm, heavy rainfall in the late summer, especially following a mild winter. Debris flows have redistributed large quantities of glacial moraine and pyroclastic materials to the lower flanks of the mountain and carved steep, deep canyons on glacier headed drainages. Canyon walls are made up of cohesionless materials and stand at or near their friction value. Slope failures mobilize into flows when the weight of the upper soil layer is increased by the addition of water, to the point where the slope cannot support the additional load, and by pore pressure flashing into positive values as the water penetration rate exceeds the hydraulic conductivity of the soil. Permeability rates are too variable to reliably predict major debris flows from rainfall intensity and duration models.

ISBN: 9780599772779Subjects--Topical Terms:

516570
Geology.

Debris flow initiation conditions on Mount Shasta, California.
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245 1 0 $a Debris flow initiation conditions on Mount Shasta, California.
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502 $a Thesis (M.S.)--University of Nevada, Reno, 2000.
520 $a Mount Shasta has experienced frequent, extensive debris flow events throughout its history. Over the last century, the largest events have been documented to occur during warm, heavy rainfall in the late summer, especially following a mild winter. Debris flows have redistributed large quantities of glacial moraine and pyroclastic materials to the lower flanks of the mountain and carved steep, deep canyons on glacier headed drainages. Canyon walls are made up of cohesionless materials and stand at or near their friction value. Slope failures mobilize into flows when the weight of the upper soil layer is increased by the addition of water, to the point where the slope cannot support the additional load, and by pore pressure flashing into positive values as the water penetration rate exceeds the hydraulic conductivity of the soil. Permeability rates are too variable to reliably predict major debris flows from rainfall intensity and duration models.
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