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150 m

150 m. Understanding Martian Gullies. 2005. 2001. Kelly Howe July 26, 2007. www.msss.com. Objective of Study. Develop laboratory procedures to test theories of fluid characteristics on Mars Simulate gully formation with morphologies similar to those observed on Mars

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150 m

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  1. 150 m Understanding Martian Gullies 2005 2001 Kelly Howe July 26, 2007 www.msss.com

  2. Objective of Study • Develop laboratory procedures to test theories of fluid characteristics on Mars • Simulate gully formation with morphologies similar to those observed on Mars • Compare morphometric results with data from MOC and MGS

  3. Procedure • Three different slopes • 10°, 20°, 30° • Four different flow rate at ml/min • 445, 705, 965, 1260 • Four runs at each flow rate at each slope

  4. Measured Parameters 3cm Channel Alcove Apron Total Length

  5. Strong Relationships to Flow Rate 3cm Channel Alcove Apron Total Length

  6. Strong Relations to Slope 3cm Channel Alcove Apron Total Length

  7. Weak Relationship with Flow Rate 3cm Channel Alcove Apron

  8. Weak Relationships with Slope 3cm Channel Alcove Apron

  9. 3 cm 3 cm Anomalous Morphologies • Two interesting channel morphologies • No channel at all • Channel at high angle to alcove

  10. Discussion • Channels • Entrenched • Steep-Walled • V-Shaped • Tapering Down Slope • Main and Secondary • Aprons • Triangular • Lobate • Alcoves • Theater-Shaped • Some Partially Filled www.msss.com

  11. 3 cm 3 cm 3 cm Discussion • Channels • Shallow • Tapering Down Slope • Main and Secondary • Alcoves • Theater-Shaped • Some Partially Filled • Aprons • Semi-Triangular • Lobate

  12. Apron Width Channel Width Alcove Width Apron Width Channel Width Alcove Width Discussion

  13. 3 cm 3 cm Discussion

  14. REU 2008 Hypotheses to Test • Shorter apron length is found on steeper martian slopes • Apron length of martian gullies increases as flow increases • Largest gullies on Mars occur on shallowest slopes • Larger martian gullies have higher flow rates

  15. Conclusions • Simulations generating 3 gully parts • Effect of saturation not quantified but does exist • Changes in flow rate and slope have definite effects • gully total length • apron length • channel total length

  16. References Malin, M.C. and Edgett, K.S., 2000, Evidence for recent groundwater seepage and surface runoff on Mars: Science, v. 288, n. 5475, p.2330-2336. Heldmann, J.L. and Mellon, M.T., 2004, Observation of martian gullies and constraints on potential formation mechanisms: Icarus, v. 168, p. 285-304. “Directory of Mars Images.” Photo Gallery. 2007. Malin Space Science Systems, Inc. July 2007 <http://www.msss.com/ msss_images/index.html>. Acknowledgments Kate Coleman Dr. John Dixon Walter Graupner

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