Short-term Unsteadiness in Aeolian Sediment Transport Across Beaches

跨海滩风沙输送的短期不稳定

• 批准号: 9511529
• 负责人: Douglas Sherman
• 金额: $ 18.19万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9511529&HistoricalAwards=false
• 关键词: Short; term; Unsteadiness; Aeolian; Sediment

SBR-9511529 Bernard O. Bauer, Principal Investigator (PI) Douglas J. Sherman, Co-PI University of Southern California, Los Angeles Short-Term Unsteadiness in Aeolian Sediment Transport Across Beaches Sediment transport is a fundamental agent of change in geomorphological systems. Our conceptual understanding of sediment transport processes is robust, but practical implementation of this knowledge is constrained by our inability to translate theory into generally-applicable predictive models. Problems occur as a result of technical and logistical hurdles. This research will enhance our understanding of the potential role of unsteadiness in sediment transport processes and the appropriate means of parameterizing models by focusing on an aeolian beach environment. The results should be indicative of transport processes in other geomorphic environments. Unsteadiness at temporal scales of seconds to tens of minutes will be investigated systematically to determine whether wind speed fluctuations are critical to modeling short-term sediment flux across beaches--existing model parameterizations of transport are based on steady-state assumptions. Continuously-measuring, fast-response sand traps employing electronic load cells will be deployed in the field to provide contemporaneous time series of both wind speed and sediment flux. The field data will provide insight into the character of transport rate variability across beaches and serve as a foundation for exploring improvements in predictive equations.

SBR-9511529 Bernard O. Bauer，首席研究员（PI）Douglas J. Sherman，南加州Co-Pi大学，洛杉矶洛杉矶的短期不稳定在海滩上的Aeolian Satement Transports satemes Sediment Transports satements satements Transport是地球系统变化的基本代理人。 我们对沉积物运输过程的概念理解是强大的，但是这种知识的实际实施是由于我们无法将理论转化为普遍可遵循的预测模型的限制。 问题是由于技术和后勤障碍而导致的。 这项研究将增强我们对不稳定在沉积物传输过程中的潜在作用以及通过关注风险风格的海滩环境来参数化模型的适当手段的潜在作用的理解。 结果应指示其他地貌环境中的运输过程。 在秒至数十分钟的时间尺度上的不稳定将被系统地研究，以确定风速波动对于在海滩上建模短期沉积物通量是否至关重要 - 运输的模型参数基于稳态假设。 使用电子负载电池的连续测量，快速响应的砂陷阱将部署在现场，以提供风速和沉积物通量的同时时间序列。 现场数据将洞悉整个海滩的运输速率可变性的特征，并为探索预测方程的改进而成为基础。