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Factors affecting water balance and percolate production for a landfill in operation

机译：影响运营中的垃圾填埋场水平衡和渗滤液生产的因素

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摘要

Percolate production and precipitation data for a full-scale landfill in operation measured over a 13-year period were used to evaluate the impact and importance of the hydrological conditions of landfill sections on the percolate production rates. Both active (open) and closed landfill sections were included in the evaluation. A simple top cover model requiring a minimum of input data was used to simulate the percolate production as a function of precipitation and landfill section hydrology. The results showed that changes over time in the hydrology of individual landfill sections (such as section closure or plantation of trees on top of closed sections) can change total landfill percolate production by more than 100 percent; thus, percolate production at an active landfill can be very different from percolate production at the same landfill after closure. Furthermore, plantation of willow on top of closed sections can increase the evapotranspiration rate thereby reducing percolate production rates by up to 47 percent compared to a grass cover. This process, however, depends upon the availability of water in the top layer, and so the evaporation rate will be less than optimal during summer where soil-water contents in the top cover are low.
机译：在13年的时间里，测量了一个全面运营的填埋场的渗滤液产量和降水量数据，用于评估垃圾掩埋场的水文条件对渗滤液生产率的影响和重要性。评估中包括了活动（开放）和封闭垃圾填埋场。一个简单的顶盖模型需要最少的输入数据，用来模拟渗滤液的产生与降水和垃圾填埋场水文的关系。结果表明，各个填埋场剖面的水文学随时间的变化（例如封闭剖面或在封闭剖面顶部种植树木）可使填埋渗滤液的总产量变化100％以上；因此，活动垃圾填埋场的渗滤液生产可能与封闭后相同垃圾填埋场的渗滤液生产非常不同。此外，将柳树种植在封闭区域的顶部可以提高蒸散速率，从而与草皮相比将渗滤液的生产率降低多达47％。但是，此过程取决于顶层的水量，因此，在夏季（顶盖中的土壤水分含量较低）的夏季，蒸发速率将达不到最佳水平。

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