[O-07] Kitchen Earth Science: its potential for producing diverse goals by hands-on experiments

[O07-07] Impact experiment to enjoy the landforms around the impact crater

★Invited Papers

*Ayako I Suzuki¹, Kei Kurita², Ichiro Kumagai³, SHIMOKAWA MICHIKO⁴ (1.Toyo University, 2.Eearth-Life Science Institute, Tokyo Institute of Technology, 3.School of Science and Engineering, Meisei University, 4.Nara Womens University)

Keywords:Impact experiments, Impact craters, Vortex rings, Mud layer

Impact craters are interesting landforms in that they combine the opposing characteristics of universality and diversity. Impact craters are common and can be observed universally on any solid bodies in the solar system.
At the same time, a wide variety of landforms are formed depending on the nature of the impactor and/or target and the conditions of the impact. While it is rare to encounter the moment when a meteorite actually impacts and forms a crater, it is easy to create impact using daily objects. Observing the topography formed by impact, formulating hypotheses from them, and examining different parameters is an experience that stimulates scientific curiosity.

In this presentation, two sets of impact experiments will be introduced and demonstrated.
A) Collision of a vortex ring with a particle layer: A vortex ring of water is collided with a particle layer laid on the bottom of a water-filled tank. The water vortex ring is made using an acrylic pipe. The topography changes as the type of particles, diameter and density, diameter and speed of the vortex ring are varied.
B) Collision of a metal ball with a layer of mud: A metal ball is dropped freely and collided with a layer of mud. The topography changes as the diameter and speed of the metal ball, water content (viscosity) and depth of the mud layer are varied.