Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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
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ISSN | 1866-6280 |
EISSN | 1866-6299 |
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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