A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess
文献类型：期刊论文
| 作者 | Turkeltaub, Tuvia2; Jia, Xiaoxu1,3; Zhu, Yuanjun3; Shao, Ming-An1,3 ; Binley, Andrew2
|
| 刊名 | WATER RESOURCES RESEARCH
 |
| 出版日期 | 2021-08-01 |
| 卷号 | 57期号:8页码:21 |
| ISSN号 | 0043-1397 |
| 关键词 | nitrate transport nitrate travel time deep loess vadose zone loess vertical variability |
| DOI | 10.1029/2020WR029250 |
| 通讯作者 | Turkeltaub, Tuvia(t.turkeltaub@lancaster.ac.uk) |
| 英文摘要 | Understanding nitrate migration through the deep vadose zone is essential for aquifer vulnerability assessments. The effect of variability of physical properties of the deep vadose zone on nitrate transport has been scarcely explored. Recently, deep nitrate storage profiles were determined in the vadose zone of the Loess Plateau of China. Using these observations along with measured soil properties, this study investigates the effect of loess vertical heterogeneity on water movement and nitrate transport through the deep vadose zone. Models of different complexity were established and calibrated. First, a simple piston flow and nitrate mass balance approach was calibrated to the observed nitrate storage. The results indicate that the total nitrate storage is estimated well, while the estimation of the distribution of nitrate is relatively poor. Subsequently, Richards' equation and the Advection-Dispersion equation were evaluated. Three different conceptualizations of the numerical models were calibrated against deep vadose zone nitrate and water content observations: (1) one-layer model assuming homogenous loess vadose zone; (2) a model that considers a hydraulic conductivity (Ks) decay function and (3) a model where the Miller-Miller scaling factors are prescribed to account for changes of the hydraulic functions with depth. Accounting for the vertical Ks decay in the numerical models improved water flow performances. The study reveals the adequacy of implementing water flow and nitrate transport numerical models together with a simple representation of the vertical loess variability, for simulating nitrate migration in loess deep vadose zone environments. |
| WOS关键词 | EFFECTIVE HYDRAULIC PARAMETERS ; GROUNDWATER RECHARGE ; HETEROGENEOUS SOILS ; NITROGEN CYCLES ; WINTER-WHEAT ; PLATEAU ; CONDUCTIVITY ; MOVEMENT ; FLUXES ; CROP |
| 资助项目 | Natural Environment Research Council[NE/N007409/1] ; Natural Environment Research Council[NE/S009159/1] ; National Natural Science Foundation of China[41571130081] |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000688205400065 |
| 资助机构 | Natural Environment Research Council ; National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/164954]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Turkeltaub, Tuvia |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 2.Univ Lancaster, Lancaster Environm Ctr, Lancaster, England 3.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Turkeltaub, Tuvia,Jia, Xiaoxu,Zhu, Yuanjun,et al. A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess[J]. WATER RESOURCES RESEARCH,2021,57(8):21. |
| APA | Turkeltaub, Tuvia,Jia, Xiaoxu,Zhu, Yuanjun,Shao, Ming-An,&Binley, Andrew.(2021).A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess.WATER RESOURCES RESEARCH,57(8),21. |
| MLA | Turkeltaub, Tuvia,et al."A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess".WATER RESOURCES RESEARCH 57.8(2021):21. |
入库方式： OAI收割
来源：地理科学与资源研究所
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