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Multi‐scale roughness spectra of Mount St. Helens debris flows
Author(s) -
Austin Richard T.,
England Anthony W.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl01875
Subject(s) - spectral line , wavelength , debris , surface finish , surface roughness , spectral slope , scattering , scaling , geology , debris flow , scale (ratio) , power law , spectral density , optics , physics , materials science , geometry , meteorology , mathematics , quantum mechanics , astronomy , composite material , statistics
A roughness spectrum allows surface structure to be interpreted as a sum of sinusoidal components with differing wavelengths. Knowledge of the roughness spectrum gives insight into the mechanisms responsible for electromagnetic scattering at a given wavelength. Measured spectra from 10‐year‐old primary debris flow surfaces at Mount St. Helens conform to a power‐law spectral model, suggesting that these surfaces are scaling over the measured range of spatial frequencies. Measured spectra from water‐deposited surfaces deviate from this model.