EarthCube GEO Domain Workshop Proposal: Envisioning a Digital Crust for Simulating Continental‐ Scale Subsurface Fluid Flow in Earth System Models

EarthCube GEO 域研讨会提案：设想一个用于模拟大陆的数字地壳

• 批准号: 1251557
• 负责人: Richard Hooper
• 金额: $ 8.47万
• 依托单位: Consortium of Universities for the Advancement of Hydrologic Sci
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2015-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1251557&HistoricalAwards=false
• 关键词: EarthCube; GEO; Domain; Workshop; Proposal

In order to advance the understanding of the critical zone and deeper crust and to better couple the exchange of mass and energy between the surface and the subsurface, this project will hold 3-day workshop to develop a long?]term vision of a digital representation of the continental crust of N. America and design concepts for prototype data model(s). The digital catalog of crustal structure, composition and permeability (as well as parameters from which permeability could be inferred) define the mechanisms by which to integrate vast amounts of dcisparate data types and to construct a coherent, 3D picture of subsurface structure and material properties, so that we can begin to represent subsurface fluid flow in Earth system models and elucidate its critical controls in the evolution of the Earth system from the past to the present and the future.Fluid circulation in the subsurface, from the critical zone to the deeper crust, plays an essential role in surface, near-surface, and crustal dynamics. In the critical zone (50m), soil water is a ecologic filter and niche differentiator where energy is abundant, explaining patterns in plant distribution globally and locally; and shallow groundwater is a primary source for rivers, lakes andwetlands in dry seasons and regions, thereby sustaining and modifying land and aquatic ecosystems, influencing water quality, and buffering against droughts and temperature extremes. Deeper in the crust (1km), the large sedimentary formations and fractured rocks hold the fresh?]water aquifers that support major societies in arid and semi-arid regions. In the deeper crust (1km), fluid flow affects diagenesis, hydrocarbons, ore deposits, faulting, earthquakes, and geothermal fields and involves water, gas and hydrocarbon flow. What are the flow paths through the soils and rocks? How fast are the flows and how long are the residence times? And how will they respond to changes in climate and land surface drivers? The answers depend on a quantitative description of the subsurface flow fields, driven by the hydraulic gradient but strongly controlled by the permeability of the Earth?fs material. Creating a digital catalogue by which to reconstruct this poorly sampled region of the planet will enable multiple aspects of the Earth sciences to advance transformatively.

为了促进对临界区和更深地壳的了解，并更好地耦合表层和次表层之间的质量和能量交换，该项目将举办为期3天的研讨会，以制定北美大陆地壳的长期愿景和原型数据模型的设计概念(S)。地壳结构、成分和渗透率的数字目录(以及可以推断渗透率的参数)定义了整合大量分散的数据类型并构建连贯的地下结构和物质特性的3D图像的机制，以便我们能够开始在地球系统模型中表示地下流体流动，并阐明其对地球系统从过去到现在和未来演化的关键控制。从临界带到地壳更深的地下流体循环在地表、近地表和地壳动力学中发挥着重要作用。在临界区(50米)，土壤水是生态过滤器和生态位区分器，在能量充足的地方，解释全球和局部植物分布的模式；浅层地下水是河流、湖泊和湿地的主要来源，在旱季和区域，从而维持和改变陆地和水生生态系统，影响水质，并缓冲干旱和极端温度的影响。在地壳更深处(1公里)，巨大的沉积建造和破碎的岩石保持着淡水含水层，这些含水层支撑着干旱和半干旱地区的主要社会。在地壳更深处(1公里)，流体流动影响成岩作用、油气、矿床、断裂、地震和地热田，并涉及水、气和碳氢化合物的流动。通过土壤和岩石的流动路径是什么？流量有多快，停留时间有多长？他们将如何应对气候和地表驱动因素的变化？答案取决于对地下流场的定量描述，地下流场由水力坡度驱动，但强烈受制于地球？FS材料的渗透性。创建一个数字星表，用来重建地球上这个采样不足的区域，将使地球科学的多个方面取得革命性的进展。