摘要
用厚度对数-面积平方根法求得金龙顶子火山四海期喷发物体积为0.2155km3。根据最大浮岩碎屑粒度等值线分布特征,估算四海期喷发柱气冲区高度2.5km、对流区高度10.0km、伞状区高度13.86km;风速25-30m/s;初始喷发温度800℃;喷火口半径50m;初始速度250m/s;质量喷发率106.54kg/s;体积喷发率103.26m3/s;喷发高峰时上升速度100m/s;喷发柱中央线温度210k;喷发柱宽度半径为2km;伞状区向外辐射速度20～7m/s;喷发持续时间约为32.91小时;释放能量为1.62×1019J。在火山喷发数值模拟软件模拟验证的基础上,对金龙顶子火山灾害进行了评价预测。
Fallout tephra volume in Sihai period of Jinlongdingzi Volcano is about 0.2155 km3 calculated by the method using straight lines on plots of log thickness versus area1/2. According to the distribution of isopachous map of maximum diameter of scoria and Sparks, models, dynamic parameters of eruptive column are estimated as follow: height of gas thrust region =2.5 km; height of convective region = 10. 0 km;height of umbrella region = 13. 86 km;wind velocity =25-30 m/s; initially e-ruptive temperature = 800℃; vent radius = 50 m; initial velocity = 250 m/s; mass discharge rate = 106.54 kg/s; volume discharge rate = 103.26m3/s; ascending velocity = 100 m/s; temperature at the column center =210 k;width radius of column =2 km,eradiation speed of umbrella =20 -7 m/s,e-ruptive duration =32.91h,discharge energy =1.62×1019J. With the simulation results,hazard assessment at Jinlongdingzi Volcano is discussed.
出处
《资源调查与环境》
2005年第1期19-26,共8页
Resources Survey & Environment
基金
中科院重要发展方向性项目(KJCXN-01)资助
关键词
金龙顶子火山
喷发柱动力学
数值模拟
灾害预测
Jinlongdingzi
volcano dynamics of column
numerical simulation hazard assessment
