长白山天池火山碎屑流灾害区划

在回顾总结了国外火山碎屑流灾害分析模型研究历史的基础上,本文选取了Flow3D模型对我国东北地区长白山天池火山未来大喷发可能产生的火山碎屑流进行了灾害区域划分。以长白山天池火山现代地形为依据,设定了11条未来爆炸式火山喷发时产生的火山碎屑流的可能流动线路。模拟结果表明,在喷发柱高度为10km的情况下,灾害区划最大半径为13.7km;在喷发柱高度为20km的情况下,灾害区划最大半径为35.4km;在喷发柱高度为30km的情况下,灾害区划最大半径为57.8km。在此基础上,得出了长白山天池火山未来发生中规模、大规模和超大规模火山喷发时火山碎屑流的覆盖范围,完成了我国第一幅长白山天池火山碎屑流灾害区划图。

Pyroclastic Flow Hazard Zonation of Changbaishan Tianchi Volcano

In this paper we reviewed the recent development of mathematical models in pyroclastic flow hazard assessment, and chose Flow3D model as the tool to simulate the coverage area of pyroclastic flow deposits from eruption of Changbaishan Tianchi volcano. The farthest distances along 11 flow paths that the pyroclastic flow may reach under three eruption scales are calculated with the model. Finally, pyroclastic hazard map of Changbaishan Tianchi volcano is generated, which shows the potentially covered areas by pyroclastic flow deposits from potential eruptions with three eruption scales, i.e. medium, large and super scales with eruption column heights of 10km, 20km and 30km respectively.