Determination and impact factor analysis of hydrodynamic dispersion coefficient within a gravel layer using an electrolyte tracer method
文献类型：期刊论文
| 作者 | Shi, Xiaonan2; Lei, Tingwu1; Yan, Yan4; Zhang, Fan3 |
| 刊名 | International Soil and Water Conservation Research
 |
| 出版日期 | 2016 |
| 卷号 | 4期号:2页码:87 |
| 关键词 | Hydrodynamic dispersion coefficient Flow velocity Gravel layer Electrolyte tracer Engineering (General). Civil engineering (General) TA1-2040 |
| ISSN号 | 2095-6339 |
| 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. |
| 资助项目 | [National Natural Science Foundation of China] ; [Foundation of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau] |
| 语种 | 英语 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/152411]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 作者单位 | 1.China Agr University, Coll Water Resources & Civil Engn, Beijing 100083, Peoples R China 2.中国科学院地理科学与资源研究所 3.中国科学院 4.HydroChina Kunming Engn Corp LTD, Kunming 650000, Yunnan, Peoples R China |
| 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]. International Soil and Water Conservation Research,2016,4(2):87. |
| 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),87. |
| 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):87. |
入库方式： OAI收割
来源：地理科学与资源研究所
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