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TEXTURAL STUDIES OF GRADING: VOLCANIC ASH FALLS
Author(s) -
SCHEIDEGGER ADRIAN E.,
POTTER PAUL EDWIN
Publication year - 1968
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1968.tb00850.x
Subject(s) - turbulence , geology , volcanic ash , volcano , sediment , geotechnical engineering , grain size , geomorphology , meteorology , seismology , geography
SUMMARY A theory of the lateral decrease of grain size and bed thickness with increasing distance of downwind transport is developed for ash falls. The theory is based on: the sediment load density of a turbulent slug of fluid, a turbulent diffusitivity coefficient, and the decay of turbulent velocity fluctuations. All three factors are founded on empirical observation and are generally accepted as having widespread applicability to turbulent sediment‐fluid mixtures. The theory yields good qualitative agreement with observational data.