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2017 ; 7
(ä): 45529
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Dynamics of volcanic ash remobilisation by wind through the Patagonian steppe
after the eruption of Cordón Caulle, 2011
#MMPMID28349929
Panebianco JE
; Mendez MJ
; Buschiazzo DE
; Bran D
; Gaitán JJ
Sci Rep
2017[Mar]; 7
(ä): 45529
PMID28349929
show ga
Wind erosion of freshly-deposited volcanic ash causes persistent storms, strongly
affecting ecosystems and human activity. Wind erosion of the volcanic ash was
measured up to 17 months after the ash deposition, at 7 sites located within the
ash-deposition area. The mass flux was measured up to 1.5?m above ground level.
Mass transport rates were over 125 times the soil wind-erosion rates observed
before the ash deposition, reaching up to 6.3?kg?m(-1) day(-1). Total mass
transport of ash during the 17 months ranged between 113.6 and 969.9?kg?m(-1)
depending on topographic location and wind exposure. The vertical distribution of
the mass flux at sites with higher vegetation cover was generally inverted as
compared to sites with lower vegetation cover. This situation lasted 7 months and
then a shift towards a more uniform vertical distribution was observed, in
coincidence with the beginning of the decline of the mass transport rates. Decay
rates differed between sites. Despite changes over time, an inverse linear
correlation between the mass transports and the mass-flux gradients was found.
Both the mass-flux gradients and the average mass-transport rates were not linked
with shear-stress partition parameters, but with the ratio: ash-fall thickness to
total vegetation cover.