Despite the prevalence of density‐dependent flow systems in the brine‐rich aquifers of arid climates and coastal aquifers, the impact of realistic geologic conditions on interface geometry and density‐dependent time‐sensitive dynamics remains poorly constrained. Salar de Atacama provides an analog for exploring interface dynamics in arid regions. A site‐specific two‐dimensional hydrostratigraphic interpretation is used to examine the dynamics of the brine‐to‐freshwater interface. With the same simulation framework and core data, a separate parametric series of hydraulic conductivity distributions with varying horizontal continuity provides a mechanistic explanation for observed dynamics. Comparing modeled interfaces and their sensitivity to perturbations in recharge in each realization yields insight into interface dynamics coupled with horizontal continuity in subsurface heterogeneity. Recharge fluctuation is introduced to each distribution following the interface reaching a dynamic steady state. Metrics for results evaluation include interface slope geometry, interface width, migration length, and response rate. Analyses suggest that the average slope of the modeled interface shallows by 0.01 and 0.05 m ⋅ m⁻¹ for an increase in continuity of highly permeable pathways by a factor of two and three, respectively. Increasing continuity also increases the overall response times and the variability in response. Results indicate that accurate representations of transient dynamics in modeling density‐dependent brine‐to‐freshwater interface dynamics requires the consideration of heterogeneity, as saline intrusion in the highest continuity group extends over twice as far on average and the modeled interface takes over 43% more time on average to reach a new dynamic steady state when compared to their homogeneous counterparts.

中文翻译：

---

水文地层连续性对卤水到淡水界面动力学的影响：干旱和胶粘流域盆地二维参数研究的意义

尽管在干旱气候和沿海含水层的盐水丰富的含水层中普遍存在着密度依赖的流动系统，但现实的地质条件对界面几何形状和密度依赖的时敏动力学的影响仍然很少受到约束。Salar de Atacama提供了一个用于探索干旱地区界面动力学的模拟物。特定地点的二维水文地层解释用于检查盐水与淡水界面的动力学。在相同的模拟框架和岩心数据的情况下，具有不同水平连续性的水力传导率分布的独立参数系列为观察到的动力学提供了机械解释。比较建模接口及其在每种实现中对补给扰动的敏感性，可以深入了解接口动力学以及地下异质性中的水平连续性。界面达到动态稳态后，会将充电波动引入每个分布。结果评估的指标包括界面坡度几何形状，界面宽度，迁移长度和响应率。分析表明，模拟的界面浅层的平均斜率分别为0.01和0.05 m⋅m^-1使高渗透性通道的连续性分别增加2倍和3倍。连续性的增加也增加了总的响应时间和响应的可变性。结果表明，在建模依赖于密度的盐水到淡水界面动力学过程中，瞬态动力学的准确表示需要考虑非均质性，因为最高连续性组中的盐水入侵平均会延伸两倍以上，而建模界面则要多出43％与同类同类产品相比，平均时间可以达到新的动态稳态。