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

这项研究的目的是对细沙中振荡流动和组合流动(振荡和单向分量的叠加)在广泛的中到长振荡周期、中等到大的最大轨道速度和小到大的单向水流速度范围内产生的床型进行广泛的实验室实验。实验将在一个长约15m、宽约1.2m、深约0.4m的大型复合流管道中进行。振荡分量是通过活塞以简谐运动迫使水在敞开的储油罐之间的封闭水平管道中来回移动，同时通过将水从管道的一端泵送到另一端来叠加电流而产生的。将沉积物中产生的层状几何结构与古代沉积记录中在浅海砂岩中观察到的层状几何结构进行比较，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进展。

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.