Effect of explosion energy and depth on the nature of explosion cloud - A field experimental study

被引:21
作者
Ohba, T [1 ]
Taniguchi, H
Oshima, H
Yoshida, M
Goto, A
机构
[1] Tohoku Univ, Grad Sch Sci, Sendai, Miyagi 9808578, Japan
[2] Tohoku Univ, Ctr NE Asian Studies, Aoba Ku, Sendai, Miyagi 9808578, Japan
[3] Hokkaido Univ, Grad Sch Sci, Kita Ku, Sapporo, Hokkaido, Japan
[4] Dia Consultant Co Ltd, Toshima Ku, Tokyo 1710014, Japan
[5] Res Grp Volcan Explos, Sendai, Miyagi 9808576, Japan
基金
日本学术振兴会;
关键词
field explosion experiments; scaling law; explosion cloud;
D O I
10.1016/S0377-0273(01)00307-9
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Field explosion experiments using dynamite were carried out to investigate the effect of explosion energy and depth on the nature of explosion cloud. The scaling law of explosion was established among the energy, depth, and the nature of explosion cloud; shape, height and duration of flow out. The shape of explosion cloud changed systematically from funnel type via elongated to short types with increasing the scaled depth of explosion. At the shallow scaled depth, both scaled height and scaled duration increased with increasing scaled depth. Both values reached the maximum at 0.003-0.004 M/J(1/3) of cube-root scaled depth, and then decreased with increasing scaled depth. If the cube-root scaled depth was over about 0.01 m/J(t/3), we could not observe any explosion cloud on the ground surface. These experimental results should be applicable to the understanding of volcanic explosions if the buoyant effect of internal heat in the explosion cloud was negligible and ground medium is identical. We applied these results to the explosion clouds of Usu phreatic explosion at 14:53 h on 17 April 2000, and estimated that the explosion energy and the depth were 4 X 10(9) J and 6 in, respectively. Errors caused by uncertainty of scaling factors are less than one order of magnitude for the energy and depth. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:33 / 42
页数:10
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