Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p51b0361a&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P51B-0361
Physics
5400 Planetology: Solid Surface Planets, 5415 Erosion And Weathering, 5464 Remote Sensing, 5470 Surface Materials And Properties, 5494 Instruments And Techniques
Scientific paper
Measurements from the Mars Orbiter Laser Altimeter on board the Mars Global Surveyor were used to construct high-resolution longitudinal profiles of several Martian valley systems. Additionally, several lower-resolution profiles were generated. Used in conjunction with altimetry cross-sections and imaging data, these profiles allow the geomorphic characterization of valley networks. In particular, the question of groundwater sapping versus surface runoff as the dominant formation mechanism can be addressed. Most valleys examined in this study exhibited linear longitudinal profiles; however, Nirgal Vallis was found to have a convex profile while Bahram Vallis was concave. The former is indicative of decreasing discharge with increasing distance, while the latter is indicative of indicative of increasing discharge with increasing distance. There are strong indications that there is a correlation between the shape of the longitudinal profile and the age and origin of the valley system.
Abramov Oleg
McEwen Alfred
Richardson Jonathan
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