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Updated: Jul 28, 2026
13:48
Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
Drainage basins and channel incision on Mars
Oded Aharonson1, Maria T Zuber, Daniel H Rothman
1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139.
Summary
Groundwater sapping, not surface runoff, likely shaped Martian drainage systems. New topographic data reveal features inconsistent with water flow, suggesting subsurface processes are key to understanding Mars's evolution.
Area of Science:
- Planetary Science
- Geomorphology
- Hydrology
Background:
- Large-scale Martian drainage systems exhibit unusual geomorphic characteristics.
- Previous interpretations favored surface runoff erosion, but new data challenge this.
Purpose of the Study:
- To investigate the erosional processes responsible for large drainage systems on Mars.
- To re-evaluate the role of surface runoff versus alternative mechanisms.
Main Methods:
- Analysis of topographic data from the Mars Orbiter Laser Altimeter (MOLA).
- Comparison of Martian landforms with terrestrial examples of groundwater sapping.
- Examination of longitudinal profiles, knickpoints, hanging valleys, and basin concavity.
Main Results:
- Martian drainage system topography is inconsistent with prolonged surface runoff erosion.
- Topography has not reached an equilibrium state expected from surface flow.
- Features suggest groundwater sapping as a significant erosional process.
Conclusions:
- Groundwater sapping is a more plausible mechanism for incision in Martian drainage systems than surface runoff.
- Longitudinally flat floor segments may indicate bedrock lithology influencing subsurface hydrology.
- Inherited structures are unlikely to fully explain observed floor levels.
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