The Hydrodynamic Dispersion Characteristics of Coral Sands

doi:10.3390/jmse7090291

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	The Hydrodynamic Dispersion Characteristics of Coral Sands
	Cui, Xiang ; Zhu, Changqi ; Hu, Mingjian ; Wang, Xinzhi ; Liu, Haifeng
	2019
发表期刊	JOURNAL OF MARINE SCIENCE AND ENGINEERING
卷号	7 期号:9 页码:-
摘要	Dispersion characteristics are important factors affecting groundwater solute transport in porous media. In marine environments, solute dispersion leads to the formation of freshwater aquifers under islands. In this study, a series of model tests were designed to explore the relationship between the dispersion characteristics of solute in calcareous sands and the particle size, degree of compactness, and gradation of porous media, with a discussion of the types of dispersion mechanisms in coral sands. It was found that the particle size of coral sands was an important parameter affecting the dispersion coefficient, with the dispersion coefficient increasing with particle size. Gradation was also an important factor affecting the dispersion coefficient of coral sands, with the dispersion coefficient increasing with increasing d(10). The dispersion coefficient of coral sands decreased approximately linearly with increasing compactness. The rate of decrease was -0.7244 for single-grained coral sands of particle size 0.25-0.5 mm. When the solute concentrations and particle sizes increased, the limiting concentration gradients at equilibrium decreased. In this study, based on the relative weights of molecular diffusion versus mechanical dispersion under different flow velocity conditions, the dispersion mechanisms were classified into five types, and for each type, a corresponding flow velocity limit was derived.
关键词	coral sands porous media model test dispersion mechanical dispersion molecular diffusion
DOI	10.3390/jmse7090291
收录类别	SCI
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000487981700013
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.198/handle/2S6PX9GI/14897
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cui, Xiang,Zhu, Changqi,Hu, Mingjian,et al. The Hydrodynamic Dispersion Characteristics of Coral Sands[J]. JOURNAL OF MARINE SCIENCE AND ENGINEERING,2019,7(9):-.
APA	Cui, Xiang,Zhu, Changqi,Hu, Mingjian,Wang, Xinzhi,&Liu, Haifeng.(2019).The Hydrodynamic Dispersion Characteristics of Coral Sands.JOURNAL OF MARINE SCIENCE AND ENGINEERING,7(9),-.
MLA	Cui, Xiang,et al."The Hydrodynamic Dispersion Characteristics of Coral Sands".JOURNAL OF MARINE SCIENCE AND ENGINEERING 7.9(2019):-.

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