Interpreting Ancient Storm-Event Stratification from Laboratory Experiments on Combined-Flow Bed Configurations

从组合流床配置的实验室实验解释古代风暴事件分层

• 批准号: 8904965
• 负责人: John Southard
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904965&HistoricalAwards=false
• 关键词: Interpreting; Ancient; Storm; Event; Stratification

The objective of this research is to make an extensive series of laboratory experiments on bed configurations produced in fine sands by oscillatory flows and combined flows (superpositions of oscillatory and unidirectional components) over a wide range of moderate to long oscillation periods, moderate to large maximum orbital velocities, and small to large unidirectional current velocities. The experiments will be made in a large new combined-flow duct about 15 m long, 1.2 m wide, and 0.4 m deep. The oscillatory component is produced by forcing water back and forth through a closed horizontal duct between open reservoir tanks by means of a piston moving in simple harmonic motion, and superimposing a current by pumping water from one end of the duct to the other at the same time. Comparison of the stratification geometry produced in the sediment deposit with that observed in shallow-marine sandstones in the ancient sedimentary record should lead to fundamental advances in the ability to interpret the depositional conditions of ancient storm-deposited sandstones.

本研究的目的是对细砂中由振荡流和组合流（振荡和单向分量的叠加）在中长振荡周期、中大最大轨道速度范围内产生的床层结构进行一系列广泛的实验室实验。从小到大的单向电流速度。实验将在一个长约15米、宽1.2米、深0.4米的新型大型联合流管道中进行。振荡分量是通过以简谐运动运动的活塞迫使水在开放的蓄水池之间的封闭水平管道中来回移动，并同时通过将水从管道的一端泵到另一端来叠加电流而产生的。将沉积物中产生的分层几何形状与古代沉积记录中在浅海砂岩中观察到的分层几何形状进行比较，应该会在解释古代风暴沉积砂岩的沉积条件方面取得根本性的进展。