Eolian Compound Crescentic Dune (Draa) Dynamics

复合-复合底形沉积形成了重要的 风成岩记录的一部分，但实际的动态 它们的气流和床型行为还没有被解决。 这显然妨碍了我们理解这些现代 并解释其存款。 在这里工作 第一次详细研究这些特征。 的结果 这项拟议的工作将是一项为期四年的研究，包括 监测底模过程和迁移，以及记录 表面气流和宏观湍流的结构， 背风面气流 这项研究代表了 研究已经完成，正在进行中，并在这里提出。 地表过程和底形迁移将从 地面上的空气。 风速计和微型叶片将用于 记录表面气流。 气球和一座装有气球的塔 仪器将被用来研究整体中学李， 倾斜气流 这项研究的意义将是 第一次记录了小学和中学的关系 大型复杂底形上的气流和由此产生的底形 反应 研究地点包括Algodones沙丘场 与S.加州和内华达州。 的应用 研究包括沙丘迁移，农田侵蚀/沉积， 海岸线沙丘过程和古风成解释 特征和风力状况。

Deposits of compound-complex bedforms form a significant portion of the eolian rock record, yet the actual dynamics of their airflow and bedform behavior have not been addressed. This obviously handicaps our ability to understand these modern bedforms and to interpret their deposit. Work here constitutes the first detailed study of these features. The results of this proposed work will be a four-year study consisting of monitoring bedform processes and migration, plus a documentation of surface airflow and of the structure of macro-turbulence of the lee-face airflow. This research represents a continuation of studies already completed, in progress, and proposed here. Surface processes and bedform migration will be mapped from the air on the ground. Anemometers and microvanes will be used to document surface airflow. Balloons and a tower with mounted instruments will be used to study the overall secondary lee- slope airflow. The significance of this study will be the first documentation of the relationship of primary and secondary airflow on a large complex bedform and the resulting bedform response. The study site includes the Algodones Dune Field bordering S. California and Nevada. Applications of the research include dune migration, erosion/deposition in farmland, shoreline dune processes, and interpretation of paleoeolian features and wind regimes.