Transport and Speciation of Metals at Disrupted Sediment-Water Interfaces: Coupled Modeling, Annular Flume, and Field Experiments

．baptista， farrenkopf PIs建议将模型与实验室和现场结果联系起来，研究在沉积物的间歇性破坏和河口和海湾的浊度最大值期间金属的运输和形态。这些研究的核心将是使用旋转环形水槽（RALF）， pi将使用它来控制在现场收集的孵育沉积物岩心上的物理状态。重点将放在铁、锰和相关元素的氧化还原循环上。选定的现场地点是哥伦比亚河河口，这里的物理和地球化学条件适合测试所提出的假设，这些pi有初步数据和正在进行的研究。总的来说，这项跨学科研究的结果将显著提高我们定量预测河口类型系统中元素的运输、命运和生物利用度的能力。这个提议是环境地球化学和生物地球化学项目的一部分。它将由海洋科学部、化学与运输系统部和地球科学部共同资助。

.ENVIRONMENTAL GEOCHEMISTRY AND BIOGEOCHEMISTRY PROGRAMABSTRACT9807686Baptista, FarrenkopfThe PIs propose to link modeling with lab and field results on the transport and speciation of metals during episodic disruptions of sediments and in turbidity maxima in estuaries and bays. Central to these studies would be the use of a rotating annular flume (RALF) that the PIs would use to control the physical regime over incubated sediment cores, which had been collected in the field. A major emphasis would be on the redox cycling of Fe, Mn and associated elements. The field site chosen is the Columbia River estuary, a site where the physical and geochemical conditions are suitable to test the proposed hypotheses, and where these PIs have preliminary data and ongoing studies. Overall, the results of this interdisciplinary study would significantly advance our ability to quantitatively predict the transport, fate and bioavailability of elements in estuarine type systems.This proposal was part of the Environmental Geochemistry and Biogeochemistry program. It will be jointly funded by the Division of Ocean Sciences, Division of Chemical and Transport Systems, and the Division of Earth Sciences. .