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Groundwater seepage landscapes from distant and local sources in experiments and on Mars

Marra, W. A.; McLelland, S. J.; Parsons, D. R.; Murphy, B. J.; Hauber, E.; Kleinhans, M. G.

Authors

W. A. Marra

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Dr Stuart McLelland S.J.McLelland@hull.ac.uk
Deputy Director of the Energy and Environment Institute

B. J. Murphy

E. Hauber

M. G. Kleinhans

Abstract

© 2014 Author(s). Valleys with theater-shaped heads can form due to the seepage of groundwater and as a result of knickpoint (waterfall) erosion generated by overland flow. This ambiguity in the mechanism of formation hampers the interpretation of such valleys on Mars, particularly since there is limited knowledge of material properties. Moreover, the hydrological implications of a groundwater or surface water origin are important for our understanding of the evolution of surface features on Mars, and a quantification of valley morphologies at the landscape scale may provide diagnostic insights on the formative hydrological conditions. However, flow patterns and the resulting landscapes produced by different sources of groundwater are poorly understood. We aim to improve the understanding of the formation of entire valley landscapes through seepage processes from different groundwater sources that will provide a framework of landscape metrics for the interpretation of such systems. We study groundwater seepage from a distant source of groundwater and from infiltration of local precipitation in a series of sandbox experiments and combine our results with previous experiments and observations of the Martian surface. Key results are that groundwater flow piracy acts on valleys fed by a distant groundwater source and results in a sparsely dissected landscape of many small and a few large valleys. In contrast, valleys fed by a local groundwater source, i.e., nearby infiltration, result in a densely dissected landscape. In addition, valleys fed by a distant groundwater source grow towards that source, while valleys with a local source grow in a broad range of directions and have a strong tendency to bifurcate, particularly on flatter surfaces. We consider these results with respect to two Martian cases: Louros Valles shows properties of seepage by a local source of groundwater and Nirgal Vallis shows evidence of a distant source, which we interpret as groundwater flow from Tharsis.

Journal Article Type Article
Publication Date Aug 4, 2015
Journal Earth surface dynamics
Print ISSN 2196-632X
Electronic ISSN 2196-632X
Publisher European Geosciences Union
Peer Reviewed Peer Reviewed
Volume 3
Issue 3
Pages 389-408
Institution Citation Marra, W. A., McLelland, S. J., Parsons, D. R., Murphy, B. J., Hauber, E., & Kleinhans, M. G. (2015). Groundwater seepage landscapes from distant and local sources in experiments and on Mars. Earth surface dynamics ESURF ; an interactive open access journal of the European Geosciences Union, 3(3), 389-408. https://doi.org/10.5194/esurf-3-389-2015
DOI https://doi.org/10.5194/esurf-3-389-2015
Keywords Groundwater
Publisher URL http://www.earth-surf-dynam.net/3/389/2015/
Copyright Statement © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.
Additional Information Copy of article first published in: Earth surface dynamics, 2015, v.3, issue 3

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Copyright Statement
© Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.




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