Document Type

Article

Abstract

The role of groundwater in forming Martian valley networks is simulated in a computer model as seepage erosion by contributing to surface runoff and as seepage weathering by causing accelerated weathering of bedrock, which makes its subsequent erosion and removal easier. Simulation results show that seepage erosion cannot mobilize large grain size sediment and is marginally effective at generating integrated valley networks with realistic rates of aquifer recharge. On the other hand, seepage weathering may play a major role in forming Martian valley networks. Seepage weathering combined with fluvial runoff creates stubby deep canyons with abrupt headwalls that are similar in morphology to terrestrial and Martian valley systems attributed to erosion by groundwater. Depending on the relative contribution of groundwater weathering to surface runoff erosion, a continuum of valley network morphology can be generated. Eolian modification masks the original differences in fluvial landforms, making different scenarios visually more similar. Martian valley networks may have developed through a range of combinations of runoff erosion and seepage weathering, which can complicate the interpretation of the processes based on final landform morphology. Unequivocal identification of seepage involvement of valley incision on Mars may not be possible without knowledge of subsurface properties (hydraulic conductivity, layering, degree of cementation, etc.) and the grain sizes of sediment transported through the valley systems.

DOI

10.1029/2007JE002981

Publication Date

1-1-2008

Comments

Based on the talk given at the Biannual IQSA Meeting in Cesena, Italy, March 31 - April 5, 2001. Submitted to the volume collecting the proceedings of the conference.

Original Citation

Luo, W., and A. D. Howard, 2008, "Computer simulation of the role of groundwater seepage in forming Martian valley networks," Journal of Geophysical Research, v. 113, E05002

Legacy Department

Department of Geography

ISSN

0148-0227

Language

eng

Publisher

American Geophysical Union

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