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Pāhoehoe flow cooling, discharge and coverage rates from thermal image chronometry.

Harris, Andrew J. L. and Dehn, Jonathan and James, Mike R. and Hamilton, Christopher and Herd, Richard and Lodato, Luigi and Steffke, Andrea (2007) Pāhoehoe flow cooling, discharge and coverage rates from thermal image chronometry. Geophysical Research Letters, 34. L19303. ISSN 0094-8276

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Abstract

Theoretically- and empirically-derived cooling rates for active pāhoehoe lava flows show that surface cooling is controlled by conductive heat loss through a crust that is thickening with the square root of time. The model is based on a linear relationship that links log(time) with surface cooling. This predictable cooling behavior can be used assess the age of recently emplaced sheet flows from their surface temperatures. Using a single thermal image, or image mosaic, this allows quantification of the variation in areal coverage rates and lava discharge rates over 48 hour periods prior to image capture. For pāhoehoe sheet flow at Kīlauea (Hawai`i) this gives coverage rates of 1–5 m2/min at discharge rates of 0.01–0.05 m3/s, increasing to ∼40 m2/min at 0.4–0.5 m3/s. Our thermal chronometry approach represents a quick and easy method of tracking flow advance over a three-day period using a single, thermal snap-shot.

Item Type: Article
Journal or Publication Title: Geophysical Research Letters
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 27746
Deposited By: Mr Richard Ingham
Deposited On: 23 Oct 2009 11:43
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:42
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/27746

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