GSTDTAP  > 气候变化
DOI10.1002/2017GL075334
Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite-Quartz Ratio
Kameda, Jun; Morisaki, Tomonori
2017-10-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2017
卷号44期号:19
文章类型Article
语种英语
国家Japan
英文摘要

Understanding the rheological properties of clay suspensions is critical to assessing the behavior of sediment gravity flows such as debris flow or turbidity current. We conducted rheological measurements of composite smectite-quartz suspensions at a temperature of 7 degrees C and a salt concentration of 0.6M. This is representative of smectite-bearing sediments under conditions on the seafloor. The flow curves obtained were fitted by the Bingham fluid model, from which we determined the Bingham yield stress and dynamic viscosity of each suspension. At a constant smectite-quartz mixing ratio, the yield stress and the dynamic viscosity tend to increase as the solid/water ratio of the suspension is increased. In the case of a constant solid/water ratio, these values increase with increasing smectite content in the smectite-quartz mixture. Additional experiments exploring differing physicochemical conditions (pH1.0-9.0; temperature 2-30 degrees C; and electrolyte (NaCl) concentration 0.2-0.6M) revealed that the influence of temperature is negligible, while pH moderately affects the rheology of the suspension. More significantly, the electrolyte concentration greatly affects the flow behavior. These variations can be explained by direct and/or indirect (double-layer) interactions between smectite-smectite particles as well as between smectite-quartz particles in the suspension. Although smectite is known as a frictionally weak material, our experimental results suggest that its occurrence can reduce the likelihood that slope failure initiates. Furthermore, smectite can effectively suppress the spreading distance once the slope has failed.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000413921300012
WOS关键词SILICA NANOPARTICLES ; SODIUM MONTMORILLONITE ; SUBMARINE LANDSLIDES ; PRESSURE ; MODEL ; FLOW ; DISPERSIONS ; VELOCITY ; SLOPE ; OCEAN
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/25604
专题气候变化
作者单位Hokkaido Univ, Grad Sch Sci, Earth & Planetary Syst Sci, Sapporo, Hokkaido, Japan
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GB/T 7714
Kameda, Jun,Morisaki, Tomonori. Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite-Quartz Ratio[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(19).
APA Kameda, Jun,&Morisaki, Tomonori.(2017).Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite-Quartz Ratio.GEOPHYSICAL RESEARCH LETTERS,44(19).
MLA Kameda, Jun,et al."Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite-Quartz Ratio".GEOPHYSICAL RESEARCH LETTERS 44.19(2017).
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