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

9730477拟议的仪器项目需要资金来开发一种低成本、多用途和适应性强的流体采样器，以部署在深达6000米的地方。它的设计目的是：1)确定通过扩散和集中流动排出流体的相对重要性；2)量化与每种流体流动模式有关的地球化学通量；3)确定幕式流动的重要性。实验流体室将捕获和隔离从沉积物-水界面逸出的流体，而对流态几乎没有干扰。它将由一个狭孔的长薄壁圆柱形腔体组成，长径比为10：1或更大。一个框架将把腔体输送到靠近底部的地方，并用一个宽大的三脚架支撑它。在三脚架就位后，试验室将部署在沉积物-水界面上，没有邻近表面干扰或改变沉积物表面流体正常向上平流的方向。通过避免流区限制，不会在系统中产生背压。正常的气流将通过钢瓶底部进入腔室，并继续通过，从顶部退出。两种示踪剂将被连续注入系统，以帮助确定流动的方向和速度。初始部署的预期持续时间将为几周到几个月，最终是几年。

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.