Arid
DOI10.1007/s12665-015-5214-9
Characterizing of a capillary barrier evapotranspirative cover under high precipitation conditions
Zhang, Wenjie1; Sun, Cheng1; Qiu, Qingwen2
通讯作者Zhang, Wenjie
来源期刊ENVIRONMENTAL EARTH SCIENCES
ISSN1866-6280
EISSN1866-6299
出版年2016
卷号75期号:6
英文摘要

Capillary barrier covers are a type of evapo-transpirative (ET) cover in which the water storage capacity of an overlying finer textured soil layer is enhanced by the presence of an underlying coarser textured soil layer. The capillary barrier will fail when the overlying finer textured layer becomes sufficiently saturated, so capillary barriers generally are considered for use in arid or semi-arid areas. As a result, there have been few tests or practical applications of capillary barrier covers in humid regions. In this study, a column test was conducted at a humid site where 2361 mm precipitation occurred during a 541-day monitoring period. Water content, percolation, surface runoff and meteorological data were recorded. The water balance of the column and a breakthrough characterization of the capillary barrier were investigated. Numerical predictions using the Hydrologic Evaluation of Landfill Performance (HELP) model and the VADOSE/W model were performed. Test results showed that surface runoff during the monitoring period was 88 mm, which corresponded to 3.7 % of precipitation. Percolation was 67 mm, which equated to 2.8 % of precipitation. The majority of the precipitation (93.5 %) was evaporated back to the atmosphere. Failure of the capillary barrier occurred only when the critical volumetric water content of the overlying clay layer was exceeded. The breakthrough was caused by consecutive intense rainfall events. VADOSE/W predicted the behavior more accurately than HELP, because VADOSE/W can model the unsaturated flow behavior associated with the capillary barrier covers.


英文关键词Capillary barrier Column test Evaportranspirative cover Water balance
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000373127400005
WOS关键词FIELD DATA ; PREDICTIONS ; PERFORMANCE
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192623
作者单位1.Shanghai Univ, Dept Civil Engn, Shanghai, Peoples R China;
2.Zhejiang Univ, MOE Key Lab Soft Soil & Geoenvironm Engn, Hangzhou 310003, Zhejiang, Peoples R China
推荐引用方式
GB/T 7714
Zhang, Wenjie,Sun, Cheng,Qiu, Qingwen. Characterizing of a capillary barrier evapotranspirative cover under high precipitation conditions[J],2016,75(6).
APA Zhang, Wenjie,Sun, Cheng,&Qiu, Qingwen.(2016).Characterizing of a capillary barrier evapotranspirative cover under high precipitation conditions.ENVIRONMENTAL EARTH SCIENCES,75(6).
MLA Zhang, Wenjie,et al."Characterizing of a capillary barrier evapotranspirative cover under high precipitation conditions".ENVIRONMENTAL EARTH SCIENCES 75.6(2016).
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