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Discrimination of fluvial and eolian features on large ignimbrite sheets around La Pacana Caldera, Chile, using Landsat and SRTM-derived DEM

Bailey, John E.; Self, Stephen; Wooler, Luke K. and Mouginis-Mark, Peter J. (2007). Discrimination of fluvial and eolian features on large ignimbrite sheets around La Pacana Caldera, Chile, using Landsat and SRTM-derived DEM. Remote Sensing of Environment, 108(1) pp. 24–41.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/j.rse.2006.10.018
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Abstract

Satellite images and ground-based observations were used to investigate the morphology and origin of valleys and ridges across large ignimbrite provinces around La Pacana Caldera, N. Chile. We studied 12 separate sites that included five different ignimbrite units that range in age from 5.6 ± 0.5 Ma to 1.35 ± 0.15 Ma. Over 400 features from within these study sites were quantified. Study sites typically have dimensions of 25 × 35 km. Measurements were made using Landsat TM, ETM+, and SRTM-derived DEM and Shaded Relief images. Morphological measurements were made of the ridges and channels, including the direction of regional slope, length, orientation and gradient of each feature. A classification of the different ignimbrite erosion influences, resulting in varying landscape morphologies identified 4 landscape types; Fluvial, Eolian, Modified and Complex. We conclude that the most prevalent features are fluvial-derived channels but the most distinctive are linear, wind-derived ridges. The orientation of these ridges suggests that strong uni-directional winds from the northwest have been constant over a long period of time (> 1 My).

Item Type: Journal Article
Copyright Holders: 2006 Elsevier Inc.
ISSN: 0034-4257
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetNASA Earth System Science Fellowship [grant number NGT5-50319]
Keywords: Ignimbrite; La Pacana; erosion patterns; Landsat TM; SRTM
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 17748
Depositing User: Colin Smith
Date Deposited: 14 Jul 2009 08:58
Last Modified: 02 Dec 2010 20:35
URI: http://oro.open.ac.uk/id/eprint/17748
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