INVESTIGADORES
EUILLADES Pablo Andres
artículos
Título:
Systematic morphometric characterization of volcanic edifices using digital elevation models
Autor/es:
PABLO GROSSE; BENJAMIN VAN WYK DE VRIES; PABLO A. EUILLADES; MATTHIEU KERVYN; PETRINOVIC, IVÁN
Revista:
GEOMORPHOLOGY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 136 p. 114 - 131
ISSN:
0169-555X
Resumen:
Quantitative characterization of the size and shape of volcanic edifices
is an essential step towards the understanding of factors controlling
volcano growth and morphology. The recent advent of digital elevation
models (DEMs) with worldwide coverage offers the opportunity to
systematically document the morphometry of all types of volcanoes using
quantitative well-formalized methodologies. We present a methodology for
the morphometric characterization of volcanic edifices. After reviewing
previous studies on volcano morphometry and the various existing DEM
sources, we describe an integrated procedure that uses a DEM and its
derived products (slope, curvature) to extract a coherent set of
morphometric parameters for a given volcanic edifice. Edifice boundaries
are manually defined by searching for breaks in slope around the base.
The parameters describe the overall size (basal and summit region area
and widths, height, volume), planar shape (ellipticity and irregularity
index of elevation contours), profile shape (height?width ratios) and
slope of the edifice. Similar parameters for relatively large (depending
on DEM spatial resolution) summit craters/calderas are also computed.
Slope values and ellipticity and irregularity indexes are extracted for
successive height intervals providing detailed information of volcano
shape as a function of height. The number of secondary peaks is also
estimated. The method is tested on thirteen composite volcanoes in
Nicaragua using three DEM datasets (90 m SRTM, 30 m ASTER G-DEM and an
80 m topographic map-derived DEM) and the resulting parameters are
evaluated in terms of boundary delineation and DEM source. Finally, the
parameters obtained for the Nicaraguan volcanoes are discussed as an
illustrative example of the type of data and information that can be
extracted systematically for volcanoes worldwide.