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| 西南山区低频泥石流块石粒径特征 |
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| DOI： |
| 中文关键词: 低频泥石流 西南山区 块石粒径 特征值 |
| 英文关键词: |
| 基金项目:中国地质调查局公益性项目（12120113010200，12120114069501） |
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| 摘要点击次数: 3136 |
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| 中文摘要: |
| 泥石流是我国常见的一种地质灾害之一，特别是低频泥石流往往给山区经济建设和人们的生命财产安全带来重大威胁.通过对西南山区7条典型低频泥石流沟的现场调查，测量粗化层块石3个方向的尺寸，得到西南山区低频泥石流粗化层块石粒径的特征值：长轴、中间轴和短轴方向长度平均值分别为52，36，21 cm.其中长轴方向大于50 cm的块石数量百分比集中在36%~58%之间，平均值为50%，线密度在0.43~1.10个/m之间，平均值为0.84个/m.这些特征值的确定为西南山区典型低频泥石流早期识别体系的建立提供了基础资料. |
| 英文摘要: |
| Debris flow is one of geological disasters in Mountains. The low frequency debris flow bring serious threaten to building and life safety in mountain areas. In mountain areas of southwest China 7 debris flow gullies were investigated and particle sizes were measured. The coarse particles size of long axes，middle axes and short axes were measured in low frequency debris flow gullies. From the analysis of measure result, the characteristic parameters of low frequency debris flow in mountain areas of southwest china were obtained: the coarse particles average size of long axes、 middle axes and short axes are 52,36,21 cm. The coarse particles number percentage of long axes more to 50 cm between 36% to 58% and average number percentage are 50%. The linear density of coarse particle long axes more to 50 cm between 0.43 to 1.10 per meter and average linear density is 0.84 per meter. The research result provides basic data to early identification system of low frequency debris flow in mountain areas of southwest china. |
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