›› 2009, Vol. 30 ›› Issue (2): 509-514.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on comparison between traditional compacted clay and evapotranspiration cover systems of landfill

LU Hai-jun 1, 2, LUAN Mao-tian 1, 2, ZHANG Jin-l i 1, 2   

  1. 1. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2007-05-18 Online:2009-02-10 Published:2011-01-27

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Abstract:

The traditional compacted clay cover system of landfill is studied for desiccation cracks. A new evapotranspiration (ET) landfill cover system is proposed. The mechanisms of compacted clay and ET cover are analyzed. On the basis of considering precipitation and evaporation, a one-dimensional vertical unsaturated soil moisture movement model is developed. The model is used to predict 576h moisture distribution law under 9 charge periods. Results show that the moisture content near the surface is highly sensitive to climate loading; and the effect is significantly attenuated and time lagged along with increasing depth. The compacted clay layer of the traditional landfill cover has low penetrability; so it can not get effective moisture charge. ET cover acts as a reservoir that stores moisture during precipitation events and subsequently returns it to atmosphere as evapotranspiration. It is reasonable agreement between model simulation and measured data. According to this analysis, these results may be used to assist in making decisions regarding proposed modification to the design of the cover system.

Key words: compacted clay, cover system, desiccation cracks, evapotranspiration, soil moisture content

CLC Number: 

  • TP 391.9
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