A Monte Carlo model for the gardening of the lunar regolith

Details A Monte Carlo model for the gardening of the lunar regolith A Monte Carlo model for the gardening of the lunar regolith

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...13..159a&link_type=abstract

(Lunar Science Institute, Symposium on Origin and Evolution of the Lunar Regolith, Houston, Tex., Nov. 13-15, 1974.) The Moon, v

Mathematics

4

Computerized Simulation, Lunar Rocks, Mathematical Models, Monte Carlo Method, Cratering, Lunar Craters, Lunar Surface, Lunar Topography, Nuclides

Scientific paper

The processes of movement and turnover of the lunar regolith are described by a Monte Carlo model. The movement of material by the direct cratering process is the dominant mode, but slumping is also included for angles exceeding the static angle of repose. Using a group of interrelated computer programs, a large number of properties are calculated, including topography, formation of layers, depth of the disturbed layer, nuclear-track distributions, and cosmogenic nuclides. In the most complex program, the history of a 36-point square array is followed for times up to 400 million years. The histories generated are complex and exhibit great variety. Because a crater covers much less area than its ejecta blanket, there is a tendency for the height change at a test point to exhibit periods of slow accumulation followed by sudden excavation. In general, the agreement with experiment and observation seems good, but two areas of disagreement stand out. First, the calculated surface is rougher than that observed. Second, the observed bombardment ages, of the order 400 million are shorter than expected (by perhaps a factor of 5).

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