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Post Processing of Zone Budgets to Generate Improved Groundwater Influx Estimates Associated with Longwall Mining

机译:对区域预算进行后处理,以生成与长壁开采相关的改进的地下水入流估算

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摘要

Impacts of underground longwall mining on groundwater systems are commonly assessed using numerical groundwater flow models that are capable of forecasting changes to strata pore pressures and rates of groundwater seepage over the mine life. Groundwater ingress to a mining operation is typically estimated using zone budgets to isolate relevant parts of a model that represent specific mining areas, and to aggregate flows at nominated times within specific model stress periods. These rates can be easily misinterpreted if simplistic averaging of daily flow budgets is adopted. Such misinterpretation has significant implications for design of underground dewatering systems for a new mine site or it may lead to model calibration errors where measured mine water seepage rates are used as a primary calibration constraint. Improved estimates of groundwater ingress can be made by generating a cumulative flow history from zone budget data, then differentiating the cumulative flow history using a low order polynomial convolved through the data set.
机译:通常使用数值地下水流模型评估地下长壁开采对地下水系统的影响,该模型能够预测矿山寿命期间地层孔隙压力和地下水渗流速率的变化。通常使用区域预算估算地下水进入采矿作业的时间,以隔离代表特定矿区的模型的相关部分,并汇总特定模型应力期内指定时间的流量。如果采用每日流量预算的简单平均,这些费率很容易被误解。这种误解对于新矿场的地下脱水系统的设计具有重大意义,或者在将测得的矿井渗水率用作主要校准约束条件的情况下,可能导致模型校准误差。可以通过从区域预算数据生成累积流量历史记录,然后使用卷积在数据集中的低阶多项式来区分累积流量历史记录,从而改进对地下水进入的估算。

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  • 来源
    《Ground water》 |2014年第4期|613-617|共5页
  • 作者

    C.D. Mackie;

  • 作者单位

    Mackie Environmental Research, Sydney, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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