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.

0207177GORELICK。物理过程模拟也可以用作一种，以帮助重建包含用于供水的含水层的沉积物的空间模式。 使用基于大规模数学的过程模型模拟沉积演化，该模型描述了数十万年以上的水文，沉积和构造事件。 感兴趣的特定过程是主要的洪水，沉积，侵蚀，压实，沉降，海平面变化和区域尺度的断层运动。 该产品也是一个定量的]，用于研究含水层地层及其与古水合和构造条件的进化联系。 该工具可用于水文地质研究中，相对流动路径和流动障碍的大规模模式很重要。应用的现场面积是北加州的圣塔克拉拉山谷（Santa Clara Valley），这大约有240 MI2地下水在圣克拉拉河谷提供了大约一半的公共供水，但泵送造成了严重的土地替代覆盖物的严重问题。 在大多数地区，含水层异质性和限制床几何形状所施加的地下水流量和土地沉降的控制知之甚少。 山谷占据了由Hayward-Calaveras和San Andreas断层系统界定的块内的结构凹陷。分别。 多Quifer系统包括与过去60万年形成的河口矿床相互结合的冲积风扇。 沉积过程仿真模型结果将与涵盖山谷某些部分的地质和水文数据进行比较。 目的是利用该模型来解释过去各种水文和地质过程对冲积层含水层建筑开发的角色。