Sedimentation of Particles of Varying Size and Density from Turbidity Currents Originating from Hot and Cold Grainflows and Suspension Dispersions

源自冷热颗粒流和悬浮液分散体的浊流对不同尺寸和密度的颗粒进行沉降

• 批准号: 0207303
• 负责人: Gary Parker
• 金额: $ 15万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0207303&HistoricalAwards=false
• 关键词: Sedimentation; Particles; Varying; Size; Density

The focus of the project is the observation of the dynamics of subaqueous volcaniclastic sedimentation from eruption-fed density currents, and the characteristics of the resulting deposits. Since the processes in question are almost impossible to observe in the field, an alternative approach will be employed here: the use of laboratory tanks to perform experiments that reproduce the deposits. The experiments have been designed to model as accurately as possible three settings: a) lacustrine turbidites of the Taupo volcano, New Zealand, b) submarine hyaloclastites consisting of limu shards and c) eruption-fed density currents of the style of Pahvant Butte. The results will be used to extend existing numerical models of turbidity currents to the case of 2-D and 3-D currents laden with vesiculated grains of variable size and density as well as hot water. The numerical models will provide new predictive tools for the study of volcaniclastic stratigraphy.This research represents a collaborative effort between Gary Parker of the University of Minnesota (turbidity currents) and James White of the University of Otago, New Zealand (subaqueous volcaniclastic deposits).

该项目的重点是观察喷发提供的密度流引起的水下火山碎屑沉积的动力学，以及由此形成的沉积物的特征。由于所讨论的过程几乎不可能在野外观察到，因此这里将采用另一种方法：使用实验室储罐进行实验，以重现沉积物。这些实验旨在尽可能准确地模拟三种环境：a)新西兰陶波火山的湖相浊积岩，b)由LIMU碎片组成的海底透明碎屑岩，c)由Pahvant Butte类型的喷发提供的密度流。这些结果将被用来将现有的浊流数值模型扩展到二维和三维水流以及热水的情况下。数值模型将为火山碎屑地层的研究提供新的预测工具。这项研究是明尼苏达大学的加里·帕克(浊流)和新西兰奥塔哥大学的詹姆斯·怀特(水下火山碎屑沉积)的合作成果。