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首页> 外文会议>International Conference on Environmental and Engineering Geophysics; 20040606-09; Wuhan(CN) >Study of magnetic fabric of dam-break sediment in 1998's in Paizhouwan area, Yangtze River
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Study of magnetic fabric of dam-break sediment in 1998's in Paizhouwan area, Yangtze River

机译：长江排洲湾地区1998年溃坝沉积物磁性结构研究

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摘要

The flooded deposit provides an important material for studying the scale and law of ancient flood disaster event in middle-lower reaches of Yangtze River. Through systematically sampling, measuring and calculating the dam-break (August 1,1998) deposit in Paizhouwan of Hubei Province, the identification marks of magnetic fabric character of modern dam-break flooded deposit in middle reaches of Yangtze River are established and discussed in this paper. The magnetic fabric characters of dam-break fan deposit are: from the foot to the edge of dam-break fans, the statically average value of magnetic fabric parameters (the anisotropy degree of magnetic susceptibility P, magnetic facet F, magnetic lineation L, the velocity of water flow F_s and magnetic matrix grain degree q) all change from large to small. The statistical directions to the principal axis of magnetic susceptibility magnitude ellipsoid in different position of dam-break fans have different features that the statistical direction changes greatly at the foot and the edge of dam-break fans. Especially, at the edge of dam-break fans the direction of maximum susceptibility principal axis is at random with no obvious main direction. But it is relatively stable in the middle of fans. And optimum direction of maximum axis is very clear.
机译：洪水沉积物为研究长江中下游古代洪水灾害的规模和规律提供了重要的资料。通过对湖北排洲湾大坝溃决（1998年8月1日）矿床的系统采样，测量和计算，建立并讨论了长江中游现代大坝溃决水库的磁性结构特征识别标志。纸。溃坝扇沉积物的磁性织物特征为：从溃坝扇的脚到边缘，磁性织物参数的静态平均值（磁化率的各向异性度P，磁刻面F，磁线L，水流速度F_s和磁性基体晶粒度q）都从大到小变化。溃坝风机不同位置处磁化率椭球体主轴的统计方向具有不同的特征，即溃坝风机的支脚和边缘处的统计方向变化很大。特别是在溃坝风机的边缘，最大磁化率主轴方向是随机的，没有明显的主方向。但是在粉丝中间相对稳定。并且最大轴的最佳方向非常清晰。

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