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Three-dimensional hydrostratigraphy and groundwater flow models in complex Quaternary deposits and weathered/fractured bedrock: evaluating increasing model complexity
Hydrogeology Journal ( IF 2.8 ) Pub Date : 2021-02-17 , DOI: 10.1007/s10040-020-02299-4
Susanne Charlotta Åberg , Annika Katarina Åberg , Kirsti Korkka-Niemi

Greater complexity in three-dimensional (3D) model structures yields more plausible groundwater recharge/discharge patterns, especially in groundwater/surface-water interactions. The construction of a 3D hydrostratigraphic model prior to flow modelling is beneficial when the hydraulic conductivity of geological units varies considerably. A workflow for 3D hydrostratigraphic modelling with Leapfrog Geo and flow modelling with MODFLOW-NWT was developed. It was used to evaluate how the modelling results for groundwater flow and recharge/discharge patterns differ when using simple or more complex hydrostratigraphic models. The workflow was applied to a study site consisting of complex Quaternary sediments underlain by fractured and weathered crystalline bedrock. Increasing the hydrostratigraphic detail appeared to improve the fit between the observed and simulated water table, and created more plausible groundwater flow patterns. Interlayered zones of low and high conductivity disperse the recharge/discharge patterns, increasing the vertical flow component. Groundwater flow was predominantly horizontal in models in which Quaternary sediments and bedrock were simplified as one layer per unit. It appears to be important to define the interlayered low-conductivity units, which can limit groundwater infiltration and also affect groundwater discharge patterns. Explicit modelling with Leapfrog Geo was found to be effective but time-consuming in the generation of scattered and thin-layered strata.



中文翻译:

复杂第四纪沉积和风化/破裂基岩中的三维水文地层和地下水流模型:评估模型复杂性的增加

三维(3D)模型结构的复杂性越高,产生的地下水补给/排出模式越合理,尤其是在地下水/地表水相互作用中。当地质单元的水力传导率变化很大时,在进行流量建模之前先构建3D水文地层模型是有益的。开发了使用Leapfrog Geo进行3D水文地层建模和使用MODFLOW-NWT进行流动建模的工作流程。它用于评估使用简单或更复杂的水文地层模型时地下水流量和补给/排放方式的建模结果如何不同。该工作流程被应用到一个研究现场,该研究现场由复杂的第四纪沉积物组成,这些沉积物被破裂的和风化的结晶基岩所覆盖。增加水文地层细节似乎可以改善观测水位与模拟水位之间的拟合度,并创造出更合理的地下水流型。低电导率和高电导率的夹层区域分散了充电/放电模式,从而增加了垂直流分量。在将第四纪沉积物和基岩简化为每层一层的模型中,地下水流主要是水平的。定义层间低电导率单元似乎很重要,它可以限制地下水的渗透并影响地下水的排放方式。发现使用Leapfrog Geo进行显式建模是有效的,但是在散布和薄层地层的生成中非常耗时。低电导率和高电导率的夹层区域分散了充电/放电模式,从而增加了垂直流分量。在将第四纪沉积物和基岩简化为每层一层的模型中,地下水流主要是水平的。定义层间低电导率单元似乎很重要,它可以限制地下水的渗透并影响地下水的排放方式。发现使用Leapfrog Geo进行显式建模是有效的,但是在散布和薄层地层的生成中非常耗时。低电导率和高电导率的夹层区域分散了充电/放电模式,从而增加了垂直流分量。在将第四纪沉积物和基岩简化为每层一层的模型中,地下水流主要是水平的。定义层间低电导率单元似乎很重要,它可以限制地下水的渗透并影响地下水的排放方式。发现使用Leapfrog Geo进行显式建模是有效的,但是在散布和薄层地层的生成中非常耗时。定义层间低电导率单元似乎很重要,它可以限制地下水的渗透并影响地下水的排放方式。发现使用Leapfrog Geo进行显式建模是有效的,但是在散布和薄层地层的生成中非常耗时。定义层间低电导率单元似乎很重要,它可以限制地下水的渗透并影响地下水的排放方式。发现使用Leapfrog Geo进行显式建模是有效的,但是在散布和薄层地层的生成中非常耗时。

更新日期:2021-02-17
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