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Cheatography

Lavaflow Complex La Palma (Canary Islands) Cheat Sheet (DRAFT) by

Lavaflow Complex La Palma (Canary Islands) depends on different factors.

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Dependece of morphology of a Lavaflow

rate of effusion (it defines max. length of lavaflow)
intera­ction between lava & enviro­nment

Physical and Chemical properties of Lava

temper­ature
rate of effusion
crystal & gas content
topography

Two types of Lava

Pahoeh­oe-Lava
smooth, ropy surface (create multiple flow lobes)
vs.
Aa-Lava
rough, jagged, spiny (clinkery)
Pahoeh­oe-Lava:
erupted at higher temper­ature & therefore beeing less viscous

Aa-Lava:
tends to be more viscous but generally advances faster than Pahoeh­oe-Lava
 

Rheology / Viscosity

Shear thinning
The higher the shears­tress the lower the viscosity
Shear thickening
The higher the shears­tress the higher the viscosity (starch in water)
Newtonian
Stoke's Law can be applied (water, oils, air)
Non newtonian
(blood, ketchup, etc.)
Bingham
Yield stress needs to be exceeded before fluid will flow

Rheology / Viscosity

 

Newton Law

Scheer­spa­nnung ( \tau)
Dynamische Viskosit├Ąt ( \eta )
Scheer­ges­chw­ind­igkeit ( \gamma )