Surface altitudes of hydrogeologic units used in the hydrogeologic framework and transient ground-water flow model of the Death Valley regional ground-water flow system, Nevada and California

A digital three-dimensional (3D) hydrogeologic framework model (HFM) represents the geometry and extent of hydrogeologic units (HGUs) and major structures in the Death Valley regional ground-water flow system (DVRFS). The HFM altitude data represent the geometry of the HFM by defining the top of the 27 HGUs in an approximately 45,000 square-kilometer region of southern Nevada and California (see "Larger Work Citation", Chapter E). The HGUs represent principal aquifers and confining units and are integral to the development of the DVRFS transient ground-water flow model (see "Larger Work Citation", Chapter F). The DVRFS framework and transient ground-water flow models are the most recent in a number of regional-scale models developed by the U.S. Geological Survey (USGS) for the U.S. Department of Energy (DOE) to support investigations at the Nevada Test Site (NTS) and at Yucca Mountain, Nevada (see "Larger Work Citation", Chapter A, page 8).

一款数字三维（3D）水文地质结构模型（Hydrogeologic Framework Model，HFM），可表征死亡谷区域地下水流系统（Death Valley Regional Ground-Water Flow System，DVRFS）内各水文地质单元（Hydrogeologic Units，HGUs）与主要构造的几何形态及分布范围。该模型的高程数据通过界定内华达州南部与加利福尼亚州境内约45000平方公里研究区内27个水文地质单元的顶面，来刻画模型的几何形态（详见《成果总引用》章节E）。上述水文地质单元为区域内的主要含水层与隔水层，是构建死亡谷区域地下水流系统瞬态地下水流模型的核心组成部分（详见《成果总引用》章节F）。死亡谷区域地下水流系统的结构模型与瞬态地下水流模型，是美国地质调查局（U.S. Geological Survey，USGS）为美国能源部（U.S. Department of Energy，DOE）支撑内华达试验场（Nevada Test Site，NTS）与内华达州尤卡山的相关调查工作而开发的一系列区域尺度模型中的最新版本（详见《成果总引用》章节A第8页）。