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Discharge rates in Ma'adim Vallis, MarsA digital elevation model (DEM) of a small part of the Martian channel Ma'adim Vallis was produced using the Frankot and Chellappa shape-from-shading algorithm. Software developed by the Dept. of Photogrammetry and Surveying at University College London uses this technique to extract slope information from the grey levels of image pixels. This technique was applied to a Viking Orbiter image of part of Ma'adim Vallis, and measurements of the channel depth and bed-slope of a channel incised into the floor of Ma'adim Vallis were made. These results were used to calculate order of magnitude estimates for discharge rates through the channel. The maximum values calculated are three orders of magnitude less than those for N. Kasei Vallis and are similar to values cited for the Missoula floods. However, when more realistic values of the water depth are used, discharge rates comparable with those for the Mississippi River result.
Document ID
Document Type
Conference Paper
Thornhill, G. D.
(Open Univ. Milton Keynes, United Kingdom)
Rothery, D. A.
(Open Univ. Milton Keynes, United Kingdom)
Murray, J. B.
(Open Univ. Milton Keynes, United Kingdom)
Day, T.
(University Coll. London, United Kingdom)
Cook, A. C.
(University Coll. London, United Kingdom)
Muller, J-P.
(University Coll. London, United Kingdom)
Iliffe, J. C.
(University Coll. London, United Kingdom)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z
Subject Category
Lunar And Planetary Exploration
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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