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Ground-water simulations for the determination of postimining recharge rates at the Belle Ayr Mine

机译：用于确定Belle Ayr矿山开采后补给率的地下水模拟

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摘要

A ground-water flow model was developed to simulate the postmining recharge rate from precipitation at the Belle Ayr surface coal mine, which is located in the Powder River Basin near Gillette, WY Wyoming state regulations require that reclaimed lands should provide a rate of recharge that approximates the premining rate. Steady-state calibration and transient simulations showed that the postmining recharge rate through spoil is at least 50 mm (2 in.) per year exceeding the original infiltration rate of 4 mm (0.16 in.) per year to shallow overburden aquifers. Major reasons for the increase include the flat topography of the reclaimed areas and the decreased spoil density. It is expected that the backfill will disaggregate and settle over time, eventually resulting in a nearly constant recharge rate that is less than 50 mm (2 in.) per year but still somewhat greater than the premining rate
机译：开发了地下水流模型来模拟位于Bellette Ayr露天煤矿（位于吉列附近的Powder River盆地）的Belle Ayr露天煤矿的降水后补给速率，怀俄明州法规要求开垦土地应提供补给速率，以便近似出雷率。稳态校准和瞬态模拟表明，通过弃土的采矿后补给速率每年至少为50毫米（2英寸），超过每年向浅层上覆含水层的原始渗透速率4毫米（0.16英寸）。增加的主要原因包括填海区的平坦地形和弃土密度降低。预计回填会随着时间的流逝而分解并最终沉降，最终导致几乎恒定的补给速率，该速率小于每年50毫米（2英寸），但仍略大于预挖速率

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