A Seafloor Sampler for the Investigation of Fluid Flow Rates and Mass Fluxes in Subduction Zones and Ridge Flanks

用于研究俯冲带和脊翼流体流速和质量通量的海底采样器

• 批准号: 9730477
• 负责人: Miriam Kastner
• 金额: $ 23.11万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-15 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9730477&HistoricalAwards=false
• 关键词: Seafloor; Sampler; Investigation; Fluid; Flow

9730477 The proposed instrumentation project requests funds to develop a low cost, versatile and adaptable fluid sampler for deployment in depths up to 6000 m. It will be designed to 1) determine the relative importance of fluid expulsion via diffuse and focused flow, 2) quantify the geochemical fluxes associated with each of the modes of fluid flow, and 3) establish the importance of episodic flow. The experimental fluid chamber will capture and isolate fluids escaping the sediment-water interface with little or no disturbance of the flow regime. It will consist of a long, thin-walled cylindrical chamber of narrow bore, and a length to diameter ratio of 10:1 or greater. A frame will convey the chamber to near the bottom and support it from a wide-spread tripod. After tripod emplacement, the chamber will be deployed to rest just on the sediment-water interface with no near-by surfaces to disturb or redirect the normal upward advection of fluids from the sediment surface. No back-pressure is created in the system by avoiding flow area restrictions. Normal flow will enter the chamber through the bottom of the cylinder and continue through, exiting at the top. Two tracers will be continuously injected into the system to help determine the direction and rate of flow. Intended duration of initial deployments will be weeks to months, and eventually years.

9730477 拟议的仪器项目需要资金来开发一种低成本、多功能且适应性强的流体采样器，可部署在最深 6000 m 的深度。其设计目的是 1) 确定通过扩散流和聚焦流进行流体排出的相对重要性，2) 量化与每种流体流模式相关的地球化学通量，以及 3) 确定情景流的重要性。 实验流体室将捕获并隔离从沉积物-水界面逸出的流体，而对流态的干扰很少或没有。它将由一个细长、薄壁、窄孔的圆柱形腔室组成，长径比为 10:1 或更大。一个框架将把房间运送到底部附近，并用一个广泛的三脚架支撑它。三脚架就位后，腔室将部署在沉积物-水界面上，附近没有表面干扰或改变沉积物表面流体正常向上平流的方向。通过避免流动面积限制，系统中不会产生背压。正常流量将通过气缸底部进入腔室并继续通过，从顶部排出。 两种示踪剂将被连续注入系统中，以帮助确定流动方向和速率。初始部署的预期持续时间将是几周到几个月，最终是几年。