垃圾填埋场毛细阻滞型腾发封顶工作机理及性能分析

张文杰; 耿潇

doi:10.11779/CJGE201603008

垃圾填埋场毛细阻滞型腾发封顶工作机理及性能分析 English Version

张文杰,
耿潇

上海大学土木工程系,上海 200072

基金项目: 国家自然科学基金项目(51178260,51478256); 上海市教委科研创新项目(14YZ005)

详细信息

作者简介:
张文杰(1978- ),男,山东青岛人,博士,副教授,从事环境土工方面的研究.E-mail: wjzhang2008@gmail.com.

中图分类号: TU41
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出版历程
- 收稿日期: 2015-01-16
- 发布日期: 2016-03-24

Performance and mechanism of capillary-barrier evaportranspiration cover of landfills

Department of Civil Engineering, Shanghai University, Shanghai 200072, China

摘要

摘要: 毛细阻滞型腾发封顶目前主要用于国外干旱,半干旱地区,在湿润气候区的研究很少.在杭州市露天构筑毛细阻滞型腾发封顶模型,量测18个月中降水,蒸发和植被蒸腾下土柱透水量,地表径流量和土体含水率,得到该封顶在不同季节的响应,分析了毛细阻滞作用机理及其性能,使用水量平衡模型(HELP)和土壤-植被-大气相互作用模型(VADOSE/W)对试验过程中的水量平衡进行模拟,探讨了数值模拟存在的问题.试验过程中,共降水2361 mm,产生地表径流88.4 mm,透水67.4 mm,其他降水均在土层吸持与腾发交替作用下最终返回大气,由于试验地区多雨期与植被腾发旺盛期重合,毛细阻滞型腾发封顶在该地区具有良好性能.由于毛细阻滞作用,使得上部黏土中存储了更多水分用于后期腾发,从而减少了透水量,当毛细阻滞界面附近土体的体积含水率超过临界含水率时毛细阻滞界面被击穿,击穿是连续强降雨作用的结果.HELP和VADOSE/W均高估了地表径流和透水量,低估了腾发量,因为VADOSE/W能考虑毛细阻滞的机理,所以大致上VADOSE/W的模拟结果比HELP 更合理和准确.
- 填埋场 /
- 腾发封顶 /
- 毛细阻滞 /
- 工作机理 /
- 工作性能
Abstract: Capillary barriers generally are considered for use in arid and semi-arid areas such that there have been few researches on capillary barrier covers in humid regions. A soil column was constructed in the open air to evaluate the performance of a capillary-barrier evaportranspiration cover. Percolation, surface runoff and water content variation under precipitation, evaporation and evapotranspiration were monitored for 18 months. A water balance model (HELP) and a soil-vegetation-atmosphere interaction model (VADOSE/W) were used to simulate the test. The total precipitation during the testing period is 2361 mm. There are 88.4 mm surface runoff and 67.4 mm percolation. Most precipitation is sent back to the atmosphere by the repeated water store-release process. The capillary barrier cover is effective because the hot season mostly coincides with the rainy season at the test site. A large amount of water is stored by the overlying clay layer during precipitation events due to the capillary break effect. Failure of the capillary break occurs only when the critical volumetric water content of the overlying finer textured clay layer is exceeded. The breakthrough is caused by consecutive intense rainfall events. Both HELP and VADOSE/W overestimate the surface runoff and percolation, and underestimate the evapotranspiration. The predictions given by VADOSE/W are more accurate than those given by HELP, because the behavior of unsaturated flows can be considered in VADOSE/W.
- landfill /
- evaportranspiration cover /
- capillary barrier /
- mechanism /
- performance

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参考文献(14)

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