GroMoPo Metadata for Edwards Aquifer numerical model

Numerical models have been an integral component in management of the Edwards Aquifer for over four decades. The scale and complexity of the models have varied considerably during this time, with the changes attributed to improvements in both numerical software and the conceptual models on which the models are predicated. Resolution of early models was coarse, which rendered them useful only in large-scale, groundwater-resource assessments. Increased resolution and improved refinement in the conceptualization of the complex hydrostratigraphic framework of the Edwards Aquifer have led to expanded applicability of the ensuing models in terms of accommodating local-scale hydraulic features such as pumping scenarios and changes in recharge/discharge mechanisms (i.e., urbanization and climate change). As part of these improvements and advancements, regional-scale groundwater availability models augmented by local-scale models based upon improved conceptualization provide the ability to: (1) replicate more extreme conditions, such as the drought-of-record; (2) improve boundary conditions by extending models to include natural hydraulic boundaries; and (3) couple groundwater flow models with surface-water flow models so that the entire terrestrial water cycle can be accommodated during water-resource management scenario assessment.

四十余年来，数值模型一直是爱德华兹含水层（Edwards Aquifer）管理工作中不可或缺的组成部分。在此期间，这类模型的规模与复杂程度历经显著变化，其演变可归因于数值软件与模型所依托的概念模型两方面的进步。早期模型的空间分辨率较为粗糙，仅能适用于大尺度地下水资源评估工作。对爱德华兹含水层复杂水文地层框架的概念化工作不断提升分辨率、优化细化程度后，后续模型的适用范围得以拓展，可表征局部尺度的水力特征，例如抽水情景以及补给/排泄机制的变化（即城市化与气候变化）。作为这类改进与进展的组成部分，基于优化概念模型构建的局部尺度模型对区域尺度地下水资源可利用量模型进行补充后，可实现以下三类功能：(1) 复现历史纪录中的极端干旱等极端情景；(2) 通过扩展模型范围纳入天然水力边界，优化模型边界条件；(3) 将地下水流模型与地表水流模型耦合，从而在水资源管理情景评估中完整表征陆地水循环全过程。