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Short-term Unsteadiness in Aeolian Sediment Transport Across Beaches

跨海滩风沙输送的短期不稳定

基本信息

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

项目摘要

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.

Bernard O. Bauer，首席研究员（PI）道格拉斯·J·谢尔曼（Douglas J. Sherman），共同研究员南加州大学，洛杉矶风成沙在海滩上输移的短期不稳定性沉积物输运是地貌系统变化的一个基本因素。我们对泥沙输运过程的概念性理解是强大的，但我们无法将理论转化为普遍适用的预测模型，这一知识的实际应用受到限制。由于技术和后勤方面的障碍，出现了一些问题。这项研究将通过关注风成海滩环境，增强我们对不稳定性在沉积物输运过程中的潜在作用以及参数化模型的适当方法的理解。其结果应能表明其他地貌环境中的迁移过程。将系统地研究从几秒到几十分钟的时间尺度上的不稳定性，以确定风速波动对模拟海滩上短期沉积物通量是否至关重要----现有的模型参数化的运输是基于稳定状态假设。将在实地部署采用电子测力计的连续测量、快速反应的集沙器，以提供风速和沉积物通量的同期时间序列。现场数据将提供深入了解跨海滩的输送率变化的特点，并作为探索预测方程的改进的基础。