The Hydrogeologic Atlas of Massachusetts: Transmissivity and Aquifer Yield (Feature Service)

The data in this feature service is a polygon feature class (converted from a 100-meter resolution raster dataset) that uses the hydraulic conductivity fields from SURFGEO24K_K_POLY, water table elevation from the statewide groundwater flow model, and bedrock altitude to calculate aquifer yield and minimum, maximum, and average transmissivity in square feet per day. Transmissivity was calculated as hydraulic conductivity multiplied by aquifer thickness. Aquifer thickness was determined by the water table elevation minus bedrock altitude. Transmissivity cutoff values to characterize aquifer yield were from the MassGIS Aquifers layer (AQUIFERS_POLY). The Hydrogeologic Atlas of Massachusetts provides data on the hydraulic properties of the statewide surficial aquifers. The datasets were developed using surficial geology, bedrock altitude, a statewide groundwater flow model, and a compilation of hydraulic property data from U.S. Geological Survey groundwater reports, Massachusetts Department of Environmental Protection Zone II reports, and other Massachusetts-specific journal articles (a total of 23 sources). One of the goals of this project was to understand current and projected future groundwater flooding risks across the state. To understand groundwater flooding risks, we developed a statewide three-dimensional groundwater flow model to simulate the water table elevation. The Hydrogeologic Atlas of Massachusetts compiles new datasets developed as input into the groundwater model, groundwater model simulation results, and other statewide map products created through this project. For further information regarding the methods of this study see Corkran et al. (2024), a report submitted to the Massachusetts Executive Office of Energy and Environmental Affairs. Suggested Citation: Corkran, D., Kirshen, A., Moran, B.J., Blin, N., King, R., Bresee, M., & Boutt, D. (2024). Massachusetts State-wide Groundwater Model and Flooding Risk Assessment 1.0. Report funded by the Massachusetts Executive Office of Energy and Environmental Affairs and published on the ResilientMass website. See full metadata and the map service.本要素服务所包含的数据为多边形要素类（polygon feature class），由100米分辨率栅格数据集（raster dataset）转换得到；该要素类依托SURFGEO24K_K_POLY的渗透系数（hydraulic conductivity）字段、全州地下水流模型的地下水位高程（water table elevation）数据，以及基岩高程（bedrock altitude），用于计算含水层产水量（aquifer yield），以及以平方英尺/天为单位的最小、最大与平均导水系数（transmissivity）。导水系数通过渗透系数乘以含水层厚度计算得出，而含水层厚度由地下水位高程减去基岩高程得到。用于表征含水层产水量的导水系数截断值，取自马萨诸塞州地理信息系统（MassGIS）含水层图层（AQUIFERS_POLY）。《马萨诸塞州水文地质图集》（Hydrogeologic Atlas of Massachusetts）提供了全州表层含水层的水文地质属性数据。本数据集的构建依托表层地质、基岩高程、全州地下水流模型，以及汇编自美国地质调查局（U.S. Geological Survey）地下水报告、马萨诸塞州环境保护部（Massachusetts Department of Environmental Protection）II区报告，以及其他马萨诸塞州本土期刊论文的水文地质属性数据，共计23个数据源。本项目的目标之一是厘清全州范围内当前及预测未来的地下水涝风险。为评估地下水涝风险，本研究构建了全州三维地下水流模型以模拟地下水位高程变化。《马萨诸塞州水文地质图集》收录了作为地下水流模型输入数据的新建数据集、地下水流模型模拟结果，以及本项目产出的其他全州范围制图产品。如需了解本研究方法的更多细节，请参阅提交给马萨诸塞州能源与环境事务执行办公室（Massachusetts Executive Office of Energy and Environmental Affairs）的Corkran等人（2024）研究报告。建议引用格式：Corkran, D., Kirshen, A., Moran, B.J., Blin, N., King, R., Bresee, M., & Boutt, D.（2024）. 《马萨诸塞州全域地下水流模型与涝风险评估1.0》。本报告由马萨诸塞州能源与环境事务执行办公室资助，发布于ResilientMass网站。如需查看完整元数据与地图服务，请参阅相关页面。