Trasnport mechanism of ballistic projectiles based on image analysis and numerical models

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K01256
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Mount Fuji Research Institute, Yamanashi Prefectural Government
• Principal Investigator: Tsunematsu Kae 山梨県富士山科学研究所, その他部局等, 研究員 (90722207)
• Co-Investigator(Kenkyū-buntansha): 吉本 充宏 山梨県富士山科学研究所, その他部局等, 研究員 (20334287)
• Co-Investigator(Renkei-kenkyūsha): ICHIHARA Mie (00376625) ; KANEKO Takayuki (90221887)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 噴石 / 画像解析 / 水蒸気噴火 / Ballista

Outline of Final Research Achievements

This study aimed to understand the mechanism of ballistic transport using the technology and skill of image analysis and numerical simulations. The outcome should be fruitful for the measure of hazard mitigation due to volcanic eruptions.A numerical model of ballistics was improved to include topographic effect and this improved model was used to simulate the distribution of ballistic blocks on the ground of the 2014 Ontake eruption. The simulated distribution of blocks was compared to the distribution of impact craters obtained from the pictures after the eruption, and the ejection direction, angle and velocity were estimated. Using these ejection conditions, we also estimated the landing velocity and energy.
This numerical model is released online as a software “Ballista” by adding graphical user interface. The Ballista software is now utilized in studies or works for making hazard maps.

Free Research Field

Physical Volcanology