Doctoral Dissertation Research Improvement: Kinetics of Wind-Blown Sand: An Investigation of Unsteadiness in Saltation Systems
博士论文研究改进:风沙动力学:跃迁系统不稳定性的研究
基本信息
- 批准号:0425770
- 负责人:
- 金额:$ 1.01万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2004
- 资助国家:美国
- 起止时间:2004-08-01 至 2006-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Turbulence is important to sediment transport, whether in air or water. Linkages between turbulent events and pulses in aeolian sediment transport have been difficult to establish, however, especially in non-laboratory environments. One deficiency with field-based studies is that none measured wind velocity and saltation (sediment "jumping," the primary mode of sand transport by wind) with precisely and tightly controlled time and space synchronization. Turbulence has large temporal and spatial gradients, so it seems illogical to expect strong correlations between wind speed and transport rates with instrument separations at meter scale. The goal of this doctoral dissertation research project is to establish and quantify the spatial and temporal scales of unsteadiness in wind and saltation fields; to identify the nature of turbulence causing transport pulsing; to characterize the spatial and temporal dimensions of wind and transport unsteadiness; and to design, build, and deploy a new sensor for the detection of saltating sand grains. Arrays of instruments will be deployed to simultaneously measure the horizontal and vertical dimensions of sediment transport and wind speed. Saltation sensors and anemometers will be placed 2 cm apart to ensure tightly controlled space synchronization. Linkages between turbulent wind events and pulses in sediment transport will be established using variable interval time averaging (VITA), enhanced VITA, and autocorrelation methods. Traps will be deployed to obtain samples of transporting sand to determine their grain size characteristics and moisture content. The research will be conducted in an Australian coastal dune system, but the results will be applicable to sediment transport processes occurring in wind and water at a broad range of settings.This project will provide a fundamental understanding of the response of sand to fluctuating (turbulent) wind conditions. This understanding is a necessary precursor to understanding the deficiencies of wind-blown sediment transport rate models. This research may have implications to coastal managers because they are interested in sediment transport rates. Coastal dunes built by blowing sand also provide a defense against flooding; a characteristic that is especially important in a time where the average global sea level is rising. An increased understanding of aeolian processes and the resultant landforms will improve capabilities to manage or preserve coastal environments. It is essential that fundamental relationships between wind and sand are understood to improve the ability to predict sediment transport rates. As a Doctoral Dissertation Research Improvement award, this award also will provide support to enable a promising student to establish a strong independent research career.
湍流对沉积物的输运很重要,无论是在空气中还是在水中。 然而,特别是在非实验室环境中,很难建立风成沉积物输送中湍流事件和脉冲之间的联系。 基于实地的研究的一个不足之处是,没有一个测量风速和跃移(沉积物“跳跃”,风搬运沙子的主要方式),精确和严格控制时间和空间同步。 湍流具有很大的时间和空间梯度,因此在米尺度上期望风速和输送率与仪器间隔之间的强相关性似乎是不合逻辑的。 这个博士论文研究项目的目标是建立和量化的空间和时间尺度的不稳定性在风和跃移领域;确定湍流的性质导致运输脉动;表征风和运输不稳定性的空间和时间维度;并设计,建造和部署一个新的传感器,用于检测跃移沙粒。 将部署一系列仪器,以同时测量沉积物迁移和风速的水平和垂直方面。 跃移传感器和风速计将相隔2厘米放置,以确保严格控制空间同步。 将使用可变间隔时间平均法、增强的可变间隔时间平均法和自相关法建立湍流风事件和沉积物输运脉冲之间的联系。 将部署陷阱以获取运输砂的样品,以确定其粒度特征和含水量。 这项研究将在澳大利亚沿海沙丘系统中进行,但研究结果将适用于各种环境下风和水的沉积物输送过程,该项目将提供对沙对波动(湍流)风条件的反应的基本了解。 这种认识是了解风吹泥沙输移率模型的不足之处的必要前提。 这项研究可能对沿海管理人员有影响,因为他们对沉积物输运率感兴趣。 海岸沙丘是由风沙形成的,也可以抵御洪水;在全球平均海平面上升的时期,这一特征尤为重要。 增加对风成过程和由此产生的地貌的了解将提高管理或保护沿海环境的能力。 了解风和沙之间的基本关系对于提高预测泥沙输移率的能力至关重要。 作为博士论文研究改进奖,该奖项还将提供支持,使有前途的学生建立一个强大的独立的研究生涯。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Douglas Sherman其他文献
Douglas Sherman的其他文献
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{{ truncateString('Douglas Sherman', 18)}}的其他基金
Granular Electrification in Aeolian Sand Transport: Paradox or Enigma?
风沙输送中的颗粒带电:悖论还是谜?
- 批准号:
2027064 - 财政年份:2020
- 资助金额:
$ 1.01万 - 项目类别:
Standard Grant
Collaborative Research: Small-Scale Variability in Aeolian Sand Transport
合作研究:风积沙输送的小尺度变化
- 批准号:
1340644 - 财政年份:2013
- 资助金额:
$ 1.01万 - 项目类别:
Continuing Grant
Collaborative Research: Small-Scale Variability in Aeolian Sand Transport
合作研究:风积沙输送的小尺度变化
- 批准号:
1061335 - 财政年份:2011
- 资助金额:
$ 1.01万 - 项目类别:
Continuing Grant
Characterizing Mass-Flux Profiles in Aeolian Saltation Systems
表征风跃移系统中的质量通量分布
- 批准号:
0822482 - 财政年份:2008
- 资助金额:
$ 1.01万 - 项目类别:
Continuing Grant
Doctoral Dissertation Research: Evaluating the von Karman Constant in Sediment-Laden Air Flow
博士论文研究:评估充满沉积物的气流中的冯卡门常数
- 批准号:
0727775 - 财政年份:2007
- 资助金额:
$ 1.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Spatial and Temporal Characteristics and Development Processes of Aeolian Sand Steamers
博士论文研究:风沙蒸船的时空特征及发展过程
- 批准号:
0002471 - 财政年份:2000
- 资助金额:
$ 1.01万 - 项目类别:
Standard Grant
Dissertation Research: Field Investigation of Aeolian Sand Transport: Mechanics of Saltation
论文研究:风沙输送的实地调查:跃移力学
- 批准号:
9712016 - 财政年份:1997
- 资助金额:
$ 1.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Effects of the Spatial and Temporal Distribution of Form Roughness on Sediment Transport
博士论文研究:形状粗糙度时空分布对泥沙输运的影响
- 批准号:
9628720 - 财政年份:1996
- 资助金额:
$ 1.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: The Generation of Cusps on Gravel Beaches: The Evaluation of Edge Waves and Self-Organization Hypotheses
博士论文研究:砾石滩上尖点的产生:边缘波和自组织假设的评估
- 批准号:
9628727 - 财政年份:1996
- 资助金额:
$ 1.01万 - 项目类别:
Standard Grant
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 - 财政年份:1995
- 资助金额:
$ 1.01万 - 项目类别:
Continuing Grant
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