Water Science and Engineering 2009, 2(3) 96-109  DOI:   10.3882/j.issn.1674-2370.2009.03.010   ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
active region model
evapotranspiration cover
percolation control
water balance
Authors
Wen-xian ZHANG
Zhan-yu ZHANG
Kang WANG
PubMed
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Experimental study and simulations of infiltration in evapotranspiration landfill covers

Wen-xian ZHANG*1, 2;Zhan-yu ZHANG2;Kang WANG3

1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P. R. China
2. Tibet Agriculture and Animal Husbandry College, Linzhi 860000, P. R. China
3. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University,
Wuhan 430072, P. R. China

Abstract

Various cover systems have been designed for landfill sites in order to minimize infiltration (percolation) into the underlying waste. This study evaluated the soil water balance performance of evapotranspiration covers (ET covers) and simulated percolation in the systems using the active region model (ARM). Experiments were conducted to measure water flow processes and water balance components in a bare soil cover and different ET covers. Results showed that vegetation played a critical role in controlling the water balance of the ET covers. In soil profiles of 60-cm depth with and without vegetation cover, the maximum soil water storage capacities were 97.2 mm and 62.8 mm, respectively. The percolation amount in the bare soil was 2.1 times that in the vegetation-covered soil. The ARM simulated percolation more accurately than the continuum model because it considered preferential flow. Numerical simulation results also indicated that using the ET cover system was an effective way of removing water through evapotranspiration, thus reducing percolation.

Keywords active region model   evapotranspiration cover   percolation control   water balance  
Received 2009-04-02 Revised 2009-07-29 Online:  
DOI: 10.3882/j.issn.1674-2370.2009.03.010
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Corresponding Authors: Wen-xian ZHANG
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