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Books > Earth & environment > Earth sciences > Geology & the lithosphere > Geological surface processes (geomorphology)
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Periglacial Preconditioning of Debris Flows in the Southern Alps, New Zealand (Hardcover, 1st ed. 2016)
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Periglacial Preconditioning of Debris Flows in the Southern Alps, New Zealand (Hardcover, 1st ed. 2016)
Series: Springer Theses
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This thesis represents one of the few studies so far that
systematically analyses environmental conditions within debris flow
source areas to determine their relative importance for debris flow
development. Environmental site conditions, such as slope gradient
and debris availability, influence the spatial and temporal
distribution of debris flows in high-alpine areas. However, current
understanding of these preconditioning controls is mostly
qualitative and inadequate for debris-flow hazard assessments and
climate change impact studies. The author's research investigates
the role of frost weathering and permafrost in the occurrence of
debris flows in the Southern Alps of New Zealand. Analyses are
based on an extensive debris flow inventory, documenting debris
flow occurrence and activity over the last 60 years in selected
catchments. Debris flow activity is compared to frost-weathering
intensity estimates from two models, allowing the practical
comparison of two competing frost-weathering hypotheses currently
discussed in literature. Information on permafrost occurrence is
based on a new distributed permafrost estimate for the Southern
Alps, derived from climatic conditions at active rock glacier
sites. This pioneering thesis provides empirical evidence that
frost weathering promotes debris-flow formation. It further
highlights the potential and limitations of regional-scale studies
for advancing our understanding of debris-flow preconditioning
factors.
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