Flow Past a Steep Mountain: Testing Hypotheses by Combining Numerical Simulations with Observations

流过陡峭的山峰：通过数值模拟与观察相结合来检验假设

• 批准号: 432130757
• 负责人: Professor Dr. Volkmar Wirth
• 金额: --
• 依托单位: Institut für Physik der Atmosphäre
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/432130757?language=en
• 关键词: Flow; Past; Steep; Mountain; Testing

The flow in the lee of a steep mountain is characterized by highly complex vortical structures. Previous research based on idealized numerical simulations has suggested that the shape of these lee vortices sensitively depends on the vertical shear of the ambient wind; on the other hand, the strength of the ambient wind is of minor importance. Here it is proposed to test these hypotheses though a combination of numerical simulations and observations. A one-month long measurement campaign will, for the first time, probe the wind field in the neighborhood of the Matterhorn using modern wind LiDAR technology in combination with radiosonde ascents and a small unmanned meteorological aircraft. In addition, extensive large eddy simulations of flow past a mountain will be performed and analzyed. The use of realistic Matterhorn orography allows one to develop the best measurements strategies for the campaign, and later to put the measurements into the context of earlier results. In addition, the simulations will be used to study the transient behavior of the wind field in the lee of a steep mountain, both with idealized and realistic orography. An important aspect thereby is the visualization of the lee vortices, which facilitates the testing of the above mentioned hypotheses.

陡峭山体背风面的流动具有高度复杂的涡结构。以前的研究基于理想化的数值模拟表明，这些背风涡的形状敏感地依赖于环境风的垂直切变;另一方面，环境风的强度是次要的。在这里，它提出了测试这些假设，通过结合数值模拟和观察。为期一个月的测量活动将首次使用现代风激光雷达技术结合无线电探空仪和小型无人气象飞机探测马特宏峰附近的风场。此外，还将对流经山脉的气流进行广泛的大涡模拟和分析。使用现实的马特洪峰地形允许一个开发的最佳测量策略的运动，后来把测量到的背景下，早期的结果。此外，模拟将被用来研究风场的瞬态行为在一个陡峭的山脉，无论是理想的和现实的地形背风。因此，一个重要的方面是背风涡的可视化，这有利于上述假设的检验。