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- W2890915291 abstract "Introduction Pahoehoe lava flows dominate terrestrial basaltic lavas throughout subaerial and submarine environments [1] on the Earth and other planetary bodies [2]. Initially flowing as a sheet with a uniformly distributed liquid lava core, thermally and mechanically preferred pathways develop -forming lava channels and tube systems [3,4]. These allow for more efficient delivery of lava from the source vent to the flow front [5], but greatly complicate efforts to estimate flow duration, lava rheology, and overall flow evolution from surface morphology. It is important to understand how these channels and tubes initialize as that yields the starting measurements for many lava flow evolution models and would affect the interpretation of early lava flow morphology. It has generally been hypothesized that channel and tube formation are controlled primarily by topography and flow-depth [e.g., 4]. However, laboratory experiments with lava have shown that viscosity contrasts (10 2 -10 4 : as shown in Figure 1) can arise from small differences in temperature and (related) crystallization or volatile content and large viscosity-contrasts have been observed in the lab to drive the formation of preferred pathways [3, 6]. Other studies have used this type of dynamic instability to explain temporal [7] and spatial [8] oscillation within fissure flows." @default.
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- W2890915291 date "2011-11-21" @default.
- W2890915291 modified "2023-09-25" @default.
- W2890915291 title "Lava flow dynamics driven by temperature-dependent viscosity variations" @default.
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