IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Identifying the water source for subsurface flow with deuterium and oxygen-18 isotopes of soil water collected from tension lysimeters and cores
Zhao, Pei1; Tang, Xiangyu1; Zhao, Peng2; Wang, Chao1; Tang, Jialiang1
Corresponding AuthorXiangyu Tang
2013
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
Volume503Pages:1-10
SubtypeArticle
AbstractThe conventional identification of soil water with pre-event water limits deep insights into the involvement of stationary and mobile soil water in subsurface hydrological processes. In three tilled sloping field plots at a hilly area of southwestern China dominated by Entisols, soil water collected with a suction lysimeter was distinguished from the total soil water through an analysis of the stable isotopes deuterium and oxygen-18. Differences in the depth profile of soil water before and after storm events were observed and used to examine how rainwater mixes with soil water and to identify the source contribution of different fractions of soil water in subsurface flow generation. Only water in the 0-10 cm soil layer was significantly affected by evaporation and infiltration. Water in the top 5 cm layer of the soil exhibited the lowest residence time because a storm can replace a substantial proportion of the pre-event water. Soil water at the 10-20 cm depth showed the longest residence time, as indicated by its high proportion of pre-event water. The isotopic signatures demonstrated that piston flow and preferential flow coexisted in this soil. High antecedent soil water content and high rain intensity favor the formation of piston flow. The water collected with the suction lysimeter represented the mobile fraction of the pre-event water in the soil, which effectively participates in the generation of subsurface flow. Newly infiltrated rainwater did not well mix with stationary pre-event water in the soil. The use of recent rainfall to represent mobile soil water may provide a practical solution for overcoming the negative effect of the spatial heterogeneity of the isotopic composition of soil water on hydrograph separation results. Bulk soil water and lysimeter water showed significant differences in isotopic composition under low soil water content or in the top soil layer. Stable isotopes in bulk and lysimeter soil water should be monitored synchronously to reveal the sources and pathways of soil water and their contributions to the generation of subsurface flow in the vadose zone. (C) 2013 Elsevier B.V. All rights reserved.
KeywordEvent Water Generation Mechanism Pre-event Water Subsurface Flow Vadose Zone Water Mixing
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1016/j.jhydrol.2013.08.033
WOS Subject ExtendedEngineering ; Geology ; Water Resources
Indexed BySCI
WOS KeywordSTABLE-ISOTOPES ; SUCTION LYSIMETERS ; PREFERENTIAL FLOW ; UNSATURATED ZONE ; STREAM-FLOW ; CATCHMENT ; HILLSLOPE ; MOVEMENT ; RUNOFF ; USA
Language英语
Quartile2区
TOP
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000327903400001
Funding OrganizationNational Natural Science Foundation of China(41101202) ; National Basic Research Program of the Ministry of Science and Technology of China(2012CB417101) ; NSFC(40801101) ; Hundred Talents Program of the Chinese Academy of Sciences and Sichuan Province
Citation statistics
Cited Times:47[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/6703
Collection山地表生过程与生态调控重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
2.Southwest Univ, Coll Resources & Environm, Chongqing 400715, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhao, Pei,Tang, Xiangyu,Zhao, Peng,et al. Identifying the water source for subsurface flow with deuterium and oxygen-18 isotopes of soil water collected from tension lysimeters and cores[J]. JOURNAL OF HYDROLOGY,2013,503:1-10.
APA Zhao, Pei,Tang, Xiangyu,Zhao, Peng,Wang, Chao,&Tang, Jialiang.(2013).Identifying the water source for subsurface flow with deuterium and oxygen-18 isotopes of soil water collected from tension lysimeters and cores.JOURNAL OF HYDROLOGY,503,1-10.
MLA Zhao, Pei,et al."Identifying the water source for subsurface flow with deuterium and oxygen-18 isotopes of soil water collected from tension lysimeters and cores".JOURNAL OF HYDROLOGY 503(2013):1-10.
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