Model files and GIS data for risk assessment in the Cambrian-Ordovician sandstone aquifer system, Northeastern Illinois, predevelopment-2070

These datasets contain modeling files and GIS data associated with a risk assessment study for the Cambrian-Ordovician sandstone aquifer system in Illinois from predevelopment (1863) to the year 2070. Modeling work was completed using the Illinois Groundwater Flow Model, a regional MODFLOW model developed for water supply planning in Illinois, as a base model. The model is run using the graphical user interface Groundwater Vistas 7.0. The development and technical details of the base Illinois Groundwater Flow Model, including hydraulic property zonation, boundary conditions, hydrostratigraphy, solver settings, and discretization, are described in Abrams et al. (2018). Modifications to this base model (the version presented here) are described in Mannix et al. (2018), Hadley et al. (2020) and Abrams and Cullen (2020). Modifications include removal of particular multi-aquifer wells to improve calibration, changing Sandwich Fault Zone properties to achieve calibration at production wells within and near the fault zone, and the incorporation of demand scenarios based on a participatory modeling project with the Southwest Water Planning Group. The zipped folder of model files contains MODFLOW input (package) files, Groundwater Vistas files, and a head file for the entire model run. The zipped folder of GIS data contains rasters of: simulated drawdown in the St. Peter sandstone from predevelopment to 2018, simulated drawdown in the Ironton-Galesville sandstone from predevelopment to 2018, simulated head difference between the St. Peter and Ironton-Galesville sandstone units in 2018, simulated head above the top of the St. Peter sandstone for the years 2029, 2050, and 2070, and simulated head above the top of the Ironton-Galesville sandstone for the years 2029, 2050, and 2070. Raster outputs were derived directly from the simulated heads in the Illinois Groundwater Flow Model. Rasters are clipped to the 8 county northeastern Illinois region (Cook, DuPage, Grundy, Kane, Kendall, Lake, McHenry, and Will counties). Well names, historic and current head targets, and spatial offsets for the Illinois Groundwater Flow Model are available upon request via a data license agreement. Please contact authors to set this up if needed.

本数据集涵盖与伊利诺伊州寒武-奥陶系砂岩含水层系统风险评估研究相关的建模文件与地理信息系统（Geographic Information System, GIS）数据，时间跨度为开发前（1863年）至2070年。本次建模工作以伊利诺伊州地下水流模型（Illinois Groundwater Flow Model）为基础模型，该模型是专为伊利诺伊州供水规划开发的区域MODFLOW模型。该模型通过图形用户界面Groundwater Vistas 7.0完成运行。基础伊利诺伊州地下水流模型的开发过程与技术细节，包括水力属性分区、边界条件、水文地层学设置、求解器参数及离散化方案，已在Abrams等人（2018）的研究中详细阐述。本次提供的模型版本对基础模型所做的修改细节，见于Mannix等人（2018）、Hadley等人（2020）以及Abrams与Cullen（2020）的研究成果。本次修改内容包括：移除特定多含水层井以优化模型校准效果；调整三明治断裂带（Sandwich Fault Zone）的属性参数，以实现该断裂带内部及邻近生产井的校准匹配；纳入基于西南水资源规划小组参与式建模项目制定的需水情景。模型文件压缩包内含MODFLOW输入（程序包）文件、Groundwater Vistas相关文件，以及全模型运行的水头文件。地理信息系统数据压缩包内含以下栅格数据：圣彼得砂岩（St. Peter sandstone）从开发前至2018年的模拟降深、埃伦顿-盖尔斯维尔砂岩（Ironton-Galesville sandstone）从开发前至2018年的模拟降深、2018年圣彼得砂岩与埃伦顿-盖尔斯维尔砂岩单元间的模拟水头差、2029年、2050年及2070年圣彼得砂岩顶面以上的模拟水头，以及2029年、2050年及2070年埃伦顿-盖尔斯维尔砂岩顶面以上的模拟水头。上述栅格输出结果直接源自伊利诺伊州地下水流模型的模拟水头数据，且已裁剪至伊利诺伊州东北部8个县的范围（库克县、杜佩奇县、格伦迪县、凯恩县、肯德尔县、莱克县、麦克亨利县以及威尔县）。伊利诺伊州地下水流模型所需的井名、历史与当前水头目标值以及空间偏移量，可通过数据许可协议申请获取。如有需要，请联系作者完成相关对接手续。