气候变化领域集成服务门户(CCPortal): Determination and impact factor analysis of hydrodynamic dispersion coefficient within a gravel layer using an electrolyte tracer method

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DOI	10.1016/j.iswcr.2016.05.001
	Determination and impact factor analysis of hydrodynamic dispersion coefficient within a gravel layer using an electrolyte tracer method
	Shi, Xiaonan; Lei, Tingwu; Yan, Yan; Zhang, Fan
通讯作者	Shi, XN (通讯作者)
发表日期	2016
ISSN	2095-6339
EISSN	2589-059X
起始页码	87
结束页码	92
卷号	4 期号:2
英文摘要	Hydrodynamic dispersion is a measure for describing the process of solute transport in porous media. Characterizing the dispersion of water flow within gravel is essential for the prediction of solute transport especially nonpoint source pollutants migration in alpine watersheds where the land surface is typically covered with gravel. In this study, an integrated model and experimental method using an electrolyte tracer is proposed for determination of the hydrodynamic dispersion coefficient. Two experimental scenarios were designed to measure electrolyte tracer transport processes in both free water flow and gravel layer flow under different slope gradients and transport distances. Subsequently, the measured data were used to simultaneously calculate both the hydrodynamic dispersion coefficient and flow velocity by fitting the experimental data with the mathematical model. Dispersivity, as a critical feature of hydrodynamic dispersion, was determined as well under the two specified scenarios. Finally, the impact mechanisms of the gravel layer and factors related to the dispersion processes were comprehensively analyzed. The results indicate that the presence of a gravel layer significantly reduces flow velocity and the hydrodynamic dispersion coefficient, but increases solute dispersivity. For the flow within gravel layers, with much lower velocity, the positive effect of the gravel layer on dispersivity may be neutralized or even surpassed by the negative effect of flow velocity. The results should be helpful in characterizing the dispersion processes of water flow within gravel layer and hence in predicting solute transport, especially in nonpoint source pollutants migration in alpine watersheds where the land surface is richly covered with gravel. (C) 2016 International Research and Training Center on Erosion and Sedimentation and China Water and Power Press. Production and Hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license
关键词	POROUS-MEDIA WATER-FLOW VELOCITY TRANSPORT DIFFUSION
英文关键词	Hydrodynamic dispersion coefficient; Flow velocity; Gravel layer; Electrolyte tracer
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Agriculture ; Water Resources
WOS类目	Environmental Sciences ; Soil Science ; Water Resources
WOS记录号	WOS:000413328000002
来源期刊	INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258766
推荐引用方式 GB/T 7714	Shi, Xiaonan,Lei, Tingwu,Yan, Yan,et al. Determination and impact factor analysis of hydrodynamic dispersion coefficient within a gravel layer using an electrolyte tracer method[J]. 中国科学院青藏高原研究所,2016,4(2).
APA	Shi, Xiaonan,Lei, Tingwu,Yan, Yan,&Zhang, Fan.(2016).Determination and impact factor analysis of hydrodynamic dispersion coefficient within a gravel layer using an electrolyte tracer method.INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH,4(2).
MLA	Shi, Xiaonan,et al."Determination and impact factor analysis of hydrodynamic dispersion coefficient within a gravel layer using an electrolyte tracer method".INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH 4.2(2016).