Experimental investigations of crater formation as a result of high-velocity impacts on sand bed

PLoS One. 2022 Mar 25;17(3):e0265546. doi: 10.1371/journal.pone.0265546. eCollection 2022.

Abstract

The formation of craters is an important issue in the investigations of the surface of the earth and other planets. The aim of the study was to check whether the different textures of sand beds affect the size and dynamics of the formation of craters and ejection curtain after high-velocity impacts. The experiments were conducted using an aluminium impactor at two impact speeds (~700 and ~1300 m∙s-1) and a sand bed composed of either a broad range of sizes (<2.0 mm) or any of the three fractions obtained from it (<0.5, 0.5-1, 1-2 mm). The diameters, depths, wall slope, and rim heights of the resulting craters were measured. The ejecta curtain was characterized by the inclination angle of walls, base diameter, and expansion velocity. The mass of the transferred material and the depth of the impactor penetration were also determined. Additionally, the results were used to calculate dimensionless parameters commonly considered in crater studies (πV, π2 and α). The texture of the sand most clearly influenced the diameters of the craters, its effect could also be seen in the case of the distance covered by the ejected material. This information appears to be relevant for future research, providing some rationale to help assess in which aspects of the phenomenon the texture may be important.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Earth, Planet
  • Planets*
  • Sand*

Substances

  • Sand

Grants and funding

This work was partially supported by (a) the National Science Centre, Poland, in the framework of the project No. 2017/26/D/ST10/01026 headed by AS; (b) Institute of Agrophysics, Polish Academy of Sciences, Poland, in the frame of statutory research; (c) a University Research Grant from the Military University of Technology, Poland (Project No. 23-780/2020) headed by RW; (d) Faculty of Mechatronics, Armament and Aerospace, Military University of Technology, Warsaw, Poland, in the frame of statutory research. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.