Paleohydrologic Controls on Alluvial Deposition: A Process-Simulation Approach to Reconstruct Aquifer Heterogeneity

冲积沉积的古水文控制：重建含水层异质性的过程模拟方法

• 批准号: 0207177
• 负责人: Steven Gorelick
• 金额: $ 30万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0207177&HistoricalAwards=false
• 关键词: Paleohydrologic; Controls; Alluvial; Deposition; Process

0207177Gorelick.Physical process simulation can be used as a too] to help reconstruct the spatial pattern of sediments comprising aquifers used for water supply. Sedimentary evolution is simulated using a process-imitating model, based on large-scale mathematics, that describes hydrologic, sedimentary, and tectonic events which have occurred over hundreds of thousands of years. The specific processes of interest are major floods, sedimentation, erosion, compaction, subsidence, sea-level variation, and regional-scale fault motion. The product is a quantitative too] to study aquifer stratigraphy and its evolutionary link to paleohydrology and tectonic conditions. This tool can be used in hydrogeologic investigations where the large-scale pattern of relative flow paths and flow barriers is important.The field area for application is the Santa Clara Valley in northern California, which is Approximately 240 mi2 Groundwater provides approximately half of the public water supply in Santa Clara Valley, yet pumping has caused a serious problem of land subsidence due to clay compaction. In most areas, the controls on groundwater flow and land subsidence imposed by aquifer heterogeneity and confining bed geometry are poorly understood. The Valley occupies a structural depression within a block bounded on the cast and west by the Hayward-Calaveras and San Andreas Fault systems. Respectively. The multiaquifer system consists of coalescing alluvial fans interfingered with estuarine deposits that have been formed over the past 600,000 years. The sedimentary process simulation model results will be compared to geologic and hydrogeologic data covering certain portions of the Valley. The goal is to use the model to interpret the roles played by various past hydrologic and geologic processes on the development of alluvial-bay aquifer architecture.

物理过程模拟可以用来帮助重建包括用于供水的含水层的沉积物的空间格局。 沉积演化是使用一个过程模拟模型，基于大规模的数学，描述了水文，沉积和构造事件发生了几十万年。 感兴趣的具体过程是主要的洪水，沉积，侵蚀，压实，沉降，海平面变化和区域规模的断层运动。 该产品是研究含水层地层及其与古水文和构造条件的演变联系的定量工具。 该工具可用于水文地质调查，其中相对流动路径和流动障碍物的大规模模式是重要的。应用领域是北方加州的圣克拉拉谷，约240平方米。地下水提供了圣克拉拉谷约一半的公共供水，但由于粘土压实，抽水造成了严重的地面沉降问题。 在大多数地区，对含水层非均匀性和封闭床几何形状对地下水流和地面沉降的控制知之甚少。 该山谷位于一个构造洼地内，该洼地的边界在铸件上，西部由海沃德-卡拉维拉斯和圣安德烈亚斯断层系统界定。分别 多含水层系统由过去60万年形成的与河口沉积物相互交错的冲积扇组成。 将把沉积过程模拟模型的结果与河谷某些地区的地质和水文地质数据进行比较。 我们的目标是使用该模型来解释过去的各种水文和地质过程的冲积海湾含水层结构的发展所发挥的作用。