Japan STA Program: Turbulence Structure and Sediment- Transport Field near a Flow Obstruction at the Bed of a Hydraulically Rough Turbulent Boundary Layer

日本 STA 计划：水力粗糙湍流边界层底部流动障碍附近的湍流结构和沉积物输送场

• 批准号: 9803854
• 负责人: Mark Schmeeckle
• 金额: $ 1.19万
• 依托单位: Fellowships
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2000-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9803854&HistoricalAwards=false
• 关键词: Japan; STA; Program; Turbulence; Structure

Schmeeckle 9803854 This award supports a 24 month Science and Technology Agency of Japan (STA) Postdoctoral Fellowship for Dr. Mark Schmeeckle at the Civil Engineering Research Institute (CERI) in Sapporo, Japan. Dr. Schmeeckle will work with Dr. Hitoshi Baba, General Director, CERI, on a research project entitled "Turbulence Structure and Sediment-transport Field Near a Flow Obstruction at the Bed of a Hydraulically Rough Turbulent Boundary Layer." The scour of sediment from around river structures during flood is a major engineering concern. Such scour can lead to the loss of the structure or expensive repairs. Unfortunately, the prediction of scour is often based on empirical methods with little physical understanding, and even scale models are difficult because it is nearly impossible to accurately scale both the flow and sediment transport fields simultaneously. Previous physically based sediment transport models only considered mean flow conditions in simplified turbulence fields and performed poorly in complex flow conditions such as around river structures. In this study a newly developed model, which directly couples the instantaneous near-bed velocity to the sediment transport field, will be applied to the case of flow around a cylindrical pier. To accomplish this goal, high-frequency measurements of near-bed velocities around the pier will be collected. These velocity measurements will then be used to drive the sediment transport model, and the sediment transport will in turn be used to predict the evolution of the scour profile around the cylinder. Successful completion of this project will result in a physically based understanding of scour around river structures. ***

Schmeeckle 9803854该奖项支持日本的24个月科学技术机构（STA）博士后奖学金，该奖学金是日本萨波罗土木工程研究所（CERI）的Mark Schmeeckle博士。 Schmeeckle博士将与CERI总监Hitoshi Baba博士合作，题为“湍流结构和沉积物 - 转运场附近的液压粗糙湍流边界层的流动阻塞附近”。 洪水期间河流结构周围的沉积物的冲刷是一个主要的工程问题。 这种冲刷会导致结构的损失或昂贵的维修。 不幸的是，冲刷的预测通常基于几乎没有物理理解的经验方法，甚至规模模型也很难，因为几乎不可能同时准确地扩展流量和沉积物传输场。 以前基于物理的沉积物传输模型仅在简化的湍流场中考虑平均流动条件，并且在复杂的流动条件（例如河流结构）中表现不佳。 在这项研究中，新开发的模型将直接将瞬时近层速度耦合到沉积物传输场，将应用于围绕圆柱形码头的流动情况。 为了实现这一目标，将收集对码头周围近床速度的高频测量。 然后将使用这些速度测量值来驱动沉积物传输模型，而沉积物传输将依次用于预测气缸周围的冲刷剖面的演变。 该项目的成功完成将导致对河流结构周围的冲刷的身体理解。 ***