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Analysing the mechanisms of soil water and vapour transport in the desert vadose zone of the extremely arid region of northern China
Du, Chaoyang1; Yu, Jingjie1,2; Wang, Ping1; Zhang, Yichi1
2018-03-01
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
Volume558Pages:592-606
Corresponding AuthorYu, Jingjie(yujj@igsnrr.ac.cn)
AbstractThe transport of water and vapour in the desert vadose zone plays a critical role in the overall water and energy balances of near-surface environments in arid regions. However, field measurements in extremely dry environments face many difficulties and challenges, so few studies have examined water and vapour transport processes in the desert vadose zone. The main objective of this study is to analyse the mechanisms of soil water and vapour transport in the desert vadose zone (depth of similar to 350 cm) by using measured and modelled data in an extremely arid environment. The field experiments are implemented in an area of the Gobi desert in northwestern China to measure the soil properties, daily soil moisture and temperature, daily water-table depth and temperature, and daily meteorological records from DOYs (Days of Year) 114-212 in 2014 (growing season). The Hydrus-1D model, which simulates the coupled transport of water, vapour and heat in the vadose zone, is employed to simulate the layered soil moisture and temperature regimes and analyse the transport processes of soil water and vapour. The measured results show that the soil water and temperatures near the land surface have visible daily fluctuations across the entire soil profile. Thermal vapour movement is the most important component of the total water flux and the soil temperature gradient is the major driving factor that affects vapour transport in the desert vadose zone. The most active water and heat exchange occurs in the upper soil layer (depths of 0-25 cm). The matric potential change from the precipitation mainly re-draws the spatio-temporal distribution of the isothermal liquid water in the soil near the land surface. The matric potential has little effect on the isothermal vapour and thermal liquid water flux. These findings offer new insights into the liquid water and vapour movement processes in the extremely arid environment. (C) 2017 Published by Elsevier B.V.
KeywordTransport mechanism Soil temperature and matric potential Liquid water and vapour Field experiments and simulations Desert vadose zone
DOI10.1016/j.jhydrol.2017.09.054
WOS KeywordMASS-FLOW MODEL ; IN-FIELD SOILS ; SIMULATION ANALYSIS ; HYDRAULIC CONDUCTIVITY ; NORTHWESTERN CHINA ; HEAT-TRANSPORT ; POROUS-MEDIA ; 2-PHASE HEAT ; HEIHE RIVER ; EVAPORATION
Indexed BySCI
Language英语
Funding ProjectScience and Technology Project of the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences ; National Natural Science Foundation of China[41571029] ; National Natural Science Foundation of China[41271049] ; National Natural Science Foundation of China[41371059]
Funding OrganizationScience and Technology Project of the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences ; National Natural Science Foundation of China
WOS Research AreaEngineering ; Geology ; Water Resources
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000427338900047
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/57323
Collection中国科学院地理科学与资源研究所
Corresponding AuthorYu, Jingjie
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Du, Chaoyang,Yu, Jingjie,Wang, Ping,et al. Analysing the mechanisms of soil water and vapour transport in the desert vadose zone of the extremely arid region of northern China[J]. JOURNAL OF HYDROLOGY,2018,558:592-606.
APA Du, Chaoyang,Yu, Jingjie,Wang, Ping,&Zhang, Yichi.(2018).Analysing the mechanisms of soil water and vapour transport in the desert vadose zone of the extremely arid region of northern China.JOURNAL OF HYDROLOGY,558,592-606.
MLA Du, Chaoyang,et al."Analysing the mechanisms of soil water and vapour transport in the desert vadose zone of the extremely arid region of northern China".JOURNAL OF HYDROLOGY 558(2018):592-606.
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