Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgre..11612004r&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue E12, CiteID E12004
Physics
Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Solid Surface Planets: Surface Materials And Properties
Scientific paper
This study demonstrates the efficacy of a recently developed, impact crater “excavation flow properties model” (EFPM) that accomplishes the following goals: (1) uses hydrodynamic streamline theory to develop the expressions that extend the classic impact ejecta scaling relationships into regions near the crater rim, where target strength and/or gravity bring crater excavation flow to a halt; (2) links this new, general ejecta position/velocity scaling relationship to the existing general crater size/volume scaling relationship, including the transition region between gravity- and strength-dominated cratering; (3) provides a means for estimating impact ejecta plume mass-density and ejecta blanket thickness, as a function of azimuth and distance from the impact site, in conditions ranging from low to high target strength; and (4) brings in our experimentally derived knowledge of impact ejection angles and the effects of oblique impact to develop a useful 2-D and 3-D model of both leading-edge and trailing-edge ejecta plume behavior. In this work, this excavation flow properties model is used to simulate the images and data produced by three laboratory impact studies which utilized modern, laser-based, non-intrusive means to investigate ejecta plume formation, expansion, and fallout from three different perspectives.
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