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Analysis of Lunar Boulder Tracks: Implications for Trafficability of Pyroclastic Deposits

Bickel, V. T.; Honniball, C. I.; Martinez, S. N.; Rogaski, A.; Sargeant, H.M.; Bell, S. K.; Czaplinski, E. C.; Farrant, B. E.; Harrington, E. M.; Tolometti, G. D. and Kring, D. A. (2019). Analysis of Lunar Boulder Tracks: Implications for Trafficability of Pyroclastic Deposits. Journal of Geophysical Research: Planets, 124(5) pp. 1296–1314.

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In a new era of lunar exploration, pyroclastic deposits have been identified as valuable targets for resource utilization and scientific inquiry. Little is understood about the geomechanical properties and the trafficability of the surface material in these areas, which is essential for successful mission planning and execution. Past incidents with rovers highlight the importance of reliable information about surface properties for future, particularly robotic, lunar mission concepts. Characteristics of 149 boulder tracks are measured in Lunar Reconnaissance Orbiter Narrow Angle Camera images and used to derive the bearing capacity of pyroclastic deposits and, for comparison, mare and highland regions from the surface down to ~5‐m depth, as a measure of trafficability. Results are compared and complemented with bearing capacity values calculated from physical property data collected in situ during Apollo, Surveyor, and Lunokhod missions. Qualitative observations of tracks show no region‐dependent differences, further suggesting similar geomechanical properties in the regions. Generally, bearing capacity increases with depth and decreases with higher slope gradients, independent of the type of region. At depths of 0.19 to 5 m, pyroclastic materials have bearing capacities equal or higher than those of mare and highland material and, thus, may be equally trafficable at surface level. Calculated bearing capacities based on orbital observations are consistent with values derived using in situ data. Bearing capacity values are used to estimate wheel sinkage of rover concepts in pyroclastic deposits. This study's findings can be used in the context of traverse planning, rover design, and in situ extraction of lunar resources.

Item Type: Journal Item
Copyright Holders: 2019 American Geophysical Union
ISSN: 2169-9097
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNNXA14AB07ANASA Solar System Exploration Research Virtual Institute
Not SetNot SetSwiss Federal Institute of Technology Zurich (ETHZ)
Not SetNot SetInternational Max Planck Research School
Keywords: Moon; lunar exploration; trafficability; boulder tracks; lunar pyroclastic deposits; rovers
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 61778
Depositing User: ORO Import
Date Deposited: 12 Jun 2019 09:21
Last Modified: 02 Jul 2019 05:08
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