Production and Abundance of Macro-Aggregate Bed Clasts from Moderately Consolidated Cohesive Beds and their implications for Sediment Management

IF 2 4区 地球科学 Q1 GEOLOGY
D. Perkey, S. J. Smith, Kelsey A. Fall, Danielle R.N. Tarpley, Carl T. Freidrichs
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引用次数: 0

Abstract

Flume based research has demonstrated that large (greater than 1mm), high water content mud aggregates can be eroded from cohesive beds and transported in bedload. Studies have also documented these types of mud clasts preserved in the lithologic record. However, questions pertaining to the abundance of muddy bed aggregates and the physical properties that result in their production remain largely unaddressed. New flume experiments were conducted on materials from numerous sediment management project locations across the United States. Image analysis of eroded sediment particles demonstrated that macro-aggregated (greater than 250 microns) mud clasts were commonly produced in moderately consolidated sediment beds (1.2 g/cm3 -1.5 g/cm3) with water content above the plastic limit. These macro-aggregates commonly accounted for more than 20% of the total eroded sediment mass. Physical properties commonly associated with cohesive behavior were evaluated for correlation to bed aggregate production and size. Clay content of the sediment bed was shown to have the greatest correlation to both macro-aggregate size and abundance.
中度固结黏性床的大骨料床层碎屑的产生和丰度及其对沉积物管理的影响
以水槽为基础的研究表明,大块(大于 1 毫米)、高含水量的泥浆聚集体可以从粘性海床中被侵蚀出来,并随海床载荷迁移。研究还记录了保存在岩性记录中的这类泥质碎屑。然而,有关泥质床聚集体的数量及其产生的物理性质的问题在很大程度上仍未得到解决。对来自美国许多沉积物管理项目地点的材料进行了新的水槽实验。对侵蚀沉积物颗粒的图像分析表明,在含水量高于塑性极限的中等固结沉积床(1.2 g/cm3 -1.5 g/cm3)中,通常会产生宏观聚集(大于 250 微米)的泥质碎屑。这些大型碎屑通常占侵蚀沉积物总量的 20% 以上。对通常与内聚行为相关的物理性质进行了评估,以确定其与床层集料的产生和大小是否相关。结果表明,沉积床的粘土含量与大集料的大小和数量关系最大。
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
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