Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p31b0136f&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P31B-0136
Mathematics
Logic
1829 Groundwater Hydrology, 5419 Hydrology And Fluvial Processes, 6225 Mars
Scientific paper
Past hydrogeologic models of Mars have focused primarily on exploring a link between large scale groundwater systems and the Martian outflow channels. These groundwater models have generally given only slight consideration to the occurrence of smaller-scale valley network that dissect much of the southern highlands. Ongoing geologic and geomorphic mapping in 6 Mars Transverse Mercator 1:500K quadrangles (17.5ºS - 27.5ºS and 345ºE - 360ºE) in southeast Margaritifer Terra, Mars, shows valley networks are often associated with the internal and external slopes of the impact basin but are absent on the basin floor. We propose a sequence of ponding in the basin followed by infiltration into the subsurface, transmission down the regional slope and sapping valleys forming on the crater flanks. The Martian valley morphologies are analogous with morphologies of terrestrial spring-fed sapping processes (i.e., amphitheater-shaped heads, stubby tributaries, steep walls, and U-shaped valleys that maintain consistent width-depth ratios along their length). Flow measurements from spring-fed channels in the Navajo Sandstone near Escalante, Utah supply data from areas actively forming sapping valleys and provide insight into the interaction between surface-water and groundwater. Measurements taken during pre-monsoon and post-snow melt run-off and planned post- monsoonal measurements will provide a range of discharge values furnishing data to model the interaction of subsurface- and surface-water flow on Mars. Published stratigraphic models of Mars postulate that the upper kilometer of material is ejecta related well-mixed unsorted debris ranging from meter sized blocks down to dust sized particles overlying fractured bedrock. Detailed mapping using high resolution datasets allows for accurate characterization of surficial material properties on a local scale which will help to better understand influences on hydrologic variables (i.e. permeability, hydraulic conductivity, etc.). Cursory mapping shows the area is characterized by ancient Noachian terrain altered by large impact basins and their associated ejecta, volcanic resurfacing and valley dissection, all of which is mantled by younger volcanic, aeolian and impact materials.
Fortezzo Corey M.
Springer A. E.
Williams Karina
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