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ESTIMATING GROUNDWATER RECHARGE AT LANDFILL SITES

机译:估算垃圾填埋场的地下水补给

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摘要

The software tool Visual HELP allows easy assessment of groundwater recharge at landfill sites for different climatic conditions. The effect of different Visual HELP parameters on the value of recharge has been studied for two different climates. Among surface runoff parameters, evapotranspiration and parameters of the upper lowpermeable layer, field capacity and wilting point of the upper layer have the greatest impact on recharge. A small variation of these parameters (by a factor of 2) may result in recharge estimate variations of 20-30 times. The sensitivity of recharge to these two parameters is several times higher for the Fraserburg site in South Africa with a relatively arid climate than for the Kingston Site in Canada with a humid climate. The range of recharge values determined by the Visual HELP modelling strongly affects the results of Visual MODFLOW simulations. Ignoring the possible range in recharge may lead to serious errors in groundwater modelling.
机译:Visual HELP软件工具可轻松评估垃圾填埋场针对不同气候条件的地下水补给量。对于两种不同的气候,已经研究了不同的Visual HELP参数对补给值的影响。在地表径流参数中,上层低渗透层的蒸散量和参数,上层的田间持水量和枯萎点对补给影响最大。这些参数的微小变化(2倍)可能导致充电估算变化20-30倍。对于南非的弗雷泽堡站点和相对潮湿的气候,对这两个参数的补给敏感性要高出几倍。由Visual HELP建模确定的补给值范围会严重影响Visual MODFLOW模拟的结果。忽视补给的可能范围可能会导致地下水建模的严重错误。

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