Collaborative Research: NSF/EAR-BSF: Coupled Sand and Clay Motion, Bed Morphodynamics, and Porewater Exchange

合作研究：NSF/EAR-BSF：沙土耦合运动、床层形态动力学和孔隙水交换

• 批准号: 1734299
• 负责人: Rina Schumer
• 金额: $ 12.19万
• 依托单位: Nevada System of Higher Education, Desert Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1734299&HistoricalAwards=false
• 关键词: Collaborative; Research; NSF; EAR; BSF

Interactions between water and sediments shape water bodies, set habitat for fish, shellfish, and other aquatic organisms, and control land stability in river floodplains and coastal regions. While the behavior of sandy systems is fairly well understood, little information is available on interactions between sand and finer sediments such as clay and mud. Mixed clay-sand deposits are very common in rivers and coastal estuaries, yet it is not currently possible to predict important behavior of clay-sand mixtures, such as changes in sand dunes, beaches, and channels following shoreline erosion. This project will advance capability to measure and predict interactions between water flow, sand, and clay in freshwater and marine systems. This capability will enable better management of critical U.S. water resources, reduce damage from coastal erosion, and facilitate shipping and military operations in shallow coastal waters. This project aims to show that clay-sand-water coupling follows a regular and fundamental set of processes: migration of clay into sand beds, accumulation of clay deposits, and feedbacks from clay filling pore spaces and cementing sand grains. Work will be conducted jointly by U.S. and Israeli research teams. Experiments will use a suite of new optical, acoustic, and X-ray imaging methods to measure water flow, clay-sand dynamics, and sediment bed formation. These results will be used to develop new mathematical theory and computer models enabling prediction of water flow and sediment dynamics in clay-sand systems.This award is cofunded by the Geomorphology and Land-use Dynamics Program, the Hydrologic Sciences Program, and the Office of International Science and Engineering.

水与沉积物之间的相互作用塑造了水体，为鱼类，贝类和其他水生生物的栖息地设定了栖息地，并控制河流洪泛区和沿海地区的土地稳定性。虽然桑迪系统的行为已得到充分理解，但几乎没有关于沙子和较细的粘土和泥浆之间的相互作用的信息。混合的粘土式沉积物在河流和沿海河口中非常普遍，但是目前不可能预测粘土式混合物的重要行为，例如海岸线侵蚀后沙丘，海滩和频道的变化。该项目将提高淡水和海洋系统中水流，沙子和粘土之间的相互作用的能力。这种能力将使美国关键的水资源更好地管理，减少沿海侵蚀的破坏，并促进浅水沿海水域的运输和军事行动。该项目的目的是表明，粘土 - 水耦合遵循了一系列常规的基本过程：将粘土迁移到沙床中，粘土沉积物的积累以及粘土填充孔隙空间的反馈和胶结沙粒。工作将由美国和以色列研究团队共同开展。实验将使用一套新的光学，声学和X射线成像方法来测量水流，粘土式动力学和沉积物床的形成。这些结果将用于开发新的数学理论和计算机模型，从而实现粘土系统中水流和沉积物动态的预测。该奖项是由地貌学和土地利用动力学计划，水文科学计划以及国际科学和工程办公室获得的。