Experimental study of estimation for paleohydraulic conditions based on grain-size of deposits

基于沉积物粒度估算古水文条件的实验研究

• 批准号: 07454127
• 负责人: MASUDA Fujio
• 金额: $ 3.01万
• 依托单位: KYOTO UNIVERSITY (1996)Osaka University (1995)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454127/
• 关键词: flume experiment; grain size; paleo-hydraulic condition; deposits; 地層; flume experiment; grain size; paleo-hydraulic condition; deposits; 地層

Many methods for the estimation of paleohydraulic condition have been proposed based on grain-size composition of deposits. In this research project I tried to clarify the phenomena using by experimental approaches.There is no universal size-distributions induced by transport, and instead, that the size distributions are strongly governed by the size distribution of the sand used in the experiments. Relationships between the grain-size distributions of individual transport modes and the texture of the "original sand" are best demonstrated by normalizing data with the size distribution of the "original sand". The results of normalizing of experimental data suggest that there is rather strict selection as to grain size whether a grain can be suspended. But the suspension process does not prefer a peculiar size among the grains which can be suspended ; i.e., grains of every size present in the suspended load are represented in the same proportion as in the "original sand". Moreover, turbidites deposited in flume show a same size pattern to suspended sands obtained from the normalizing. Avalanching and saltating sands, however, have their characteristic grain-size distributions modified even by short-distance transport.In conclusion we can not estimate the paleohydraulic condition directly from the information of grain-size compositions of deposits!

已经提出了许多基于晶粒大小的沉积物组成的古氢气条件估计的方法。在这个研究项目中，我试图使用实验方法来阐明现象。没有传输引起的通用大小分布，而是，大小分布受到实验中使用的沙子的尺寸分布的强烈控制。通过将“原始沙子”的尺寸分布标准化数据，可以证明单个传输模式的晶粒大小分布与“原始沙子”的质地之间的关系。实验数据归一化的结果表明，对于晶粒尺寸是否可以悬浮，存在相当严格的选择。但是，悬架过程不希望可以悬浮的谷物中的特殊尺寸。即，悬浮载荷中存在的每个尺寸的晶粒的比例与“原始沙子”相同。此外，沉积在水槽中的浊度与从归一化获得的悬浮沙子相同。然而，雪崩和盐的沙子的特征性晶粒大小的分布即使是通过短距离运输也会改变的。总而言之，我们无法直接从沉积物的晶粒大小组成的信息中直接估算古hydraulic条件！