Dust Transport in Convectively Stratified Atmospheric Boundary Layer

对流分层大气边界层中的粉尘输送

• 批准号: 1500224
• 负责人: William Anderson
• 金额: $ 22.15万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-01 至 2022-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1500224&HistoricalAwards=false
• 关键词: Dust; Transport; Convectively; Stratified; Atmospheric

Severe wind erosion and dust storms are a concern in the south central and southwestern parts of the United States. Prolonged drought conditions enhance the potential for Aeolian transport, where wind has the ability to transport and deposit materials such as sand and dirt. Advances in numerical modeling of the near-surface boundary layer of the atmosphere have made it possible to better connect the atmospheric and surface processes involved in Aeolian transport, in order to better understand how and when dust events will occur. The results of this study will be a step towards providing better information on which to make decisions regarding water resources and land use. The study will also include a variety of educational and outreach activities to connect the research to students and the public.This award will provide funding for a study on the characteristics of neutrally and convectively stratified atmospheric boundary layer flows with a particular focus on flow over sparsely vegetated, semi-arid landscapes on the west Texas panhandle region of the Southern High Plains. The location of interest is known for severe wind erosion and dust storms, and the minimal topographic relief makes the region ideal for fundamental research studies with large-eddy simulation (LES) models. Modeling aspects of the proposal will be grounded by the use of field data courtesy of a collaboration with the US Department of Agriculture. Specific tasks will include: determining the potential to anchor low- and high-momentum regions in the flow using isolated obstacles, determining the role of solar heating in modifying the turbulence structure, and incorporating transport of suspended dust and inertial sediment into the LES code.

在美国中南部中部和西南部，严重的风侵蚀和沙尘暴是一场关注的问题。 长时间的干旱条件增强了风险运输的潜力，风风具有运输和沉积诸如沙子和污垢之类的材料的能力。 大气的近表面边界层的数值建模的进步使得更好地连接了风化性运输中涉及的大气和表面过程，以便更好地了解如何以及何时发生灰尘事件。 这项研究的结果将是提供更好的信息，以做出有关水资源和土地利用的决定的一步。 该研究还将包括各种教育和外展活动，以将研究与学生联系起来和公众。该奖项将为有关中性和对流分层的大气边界层流的特征提供资金，并特别关注稀疏的植被，半肉食的景观，而南部高级宽广的西克萨斯州Panhandle地区的稀疏植被，半阿里德。 感兴趣的位置以严重的风侵蚀和沙尘暴而闻名，最小的地形浮雕使该区域是大涡模拟（LES）模型的基础研究的理想选择。 该提案的建模方面将通过与美国农业部合作的使用实地数据的使用为基础。 特定的任务将包括：确定使用孤立的障碍物在流中锚定低和高摩肌区域的潜力，确定太阳加热在修饰湍流结构中的作用，并将悬浮的灰尘和惯性沉积物的运输纳入LES代码。