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Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation
Turkeltaub, Tuvia1; Jia, Xiaoxu2,3; Zhu, Yuanjun4; Shao, Ming-An2,3,4; Binley, Andrew1
2018-07-01
Source PublicationWATER RESOURCES RESEARCH
ISSN0043-1397
Volume54Issue:7Pages:4332-4346
Corresponding AuthorTurkeltaub, Tuvia(t.turkeltaub@lancaster.ac.uk)
AbstractThe Loess Plateau of China (LPC) is suffering from the impacts of overexploitation of groundwater, leading to a decline in the regional water table. This is compounded by relatively recent large-scale transformation of land use, which may impact groundwater recharge and threaten future water quality from intensive nitrogen fertilizer application. Understanding the regional unsaturated water flow and nitrate travel time in the deep vadose zone is crucial for the sustainable management of the LPC groundwater system. We develop here a regional-scale model that exploits an extensive database of soil properties derived from recent intensive soil profile sampling over the LPC, together with climate, vadose zone thickness, and land use data. The model solves the Richards equation and a conservative solute transport model using a multiple 1D column approach. A comparison between model simulations and observations at five sites reveals good model performance. Application over the LPC indicates that areas with dense irrigated agricultural land use contribute significantly to groundwater recharge. By using land use cover information from 1975 to 2008, simulations reveal that the transition from agriculture to forest and grassland accounts for a small reduction of the total annual recharge (6.1%). Modeled nitrate travel times through the deep unsaturated zone range between decades and centuries; however, recent loading of anthropogenic nitrate is expected to reach the aquifer in the near future under irrigated areas or where the vadose zone is relatively thin. The model simulations provide valuable information for assessing future vulnerability of groundwater resources over a regional scale.
DOI10.1029/2017WR022190
WOS KeywordSOIL-WATER CONTENT ; GROUNDWATER RECHARGE ; UNSATURATED ZONE ; HYDRAULIC CONDUCTIVITY ; NITROGEN-BALANCE ; NORTHERN CHINA ; FOOD SECURITY ; WINTER-WHEAT ; APPLE-TREES ; TIME-LAG
Indexed BySCI
Language英语
Funding ProjectNatural Environment Research Council[NE/N007409/1] ; National Natural Science Foundation of China[41571130081]
Funding OrganizationNatural Environment Research Council ; National Natural Science Foundation of China
WOS Research AreaEnvironmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
WOS SubjectEnvironmental Sciences ; Limnology ; Water Resources
WOS IDWOS:000442502100009
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/54403
Collection中国科学院地理科学与资源研究所
Corresponding AuthorTurkeltaub, Tuvia
Affiliation1.Univ Lancaster, Lancaster Environm Ctr, Lancaster, England
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
4.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess, Yangling, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Turkeltaub, Tuvia,Jia, Xiaoxu,Zhu, Yuanjun,et al. Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation[J]. WATER RESOURCES RESEARCH,2018,54(7):4332-4346.
APA Turkeltaub, Tuvia,Jia, Xiaoxu,Zhu, Yuanjun,Shao, Ming-An,&Binley, Andrew.(2018).Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation.WATER RESOURCES RESEARCH,54(7),4332-4346.
MLA Turkeltaub, Tuvia,et al."Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional-Scale Model Investigation".WATER RESOURCES RESEARCH 54.7(2018):4332-4346.
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