The present work aims to use an atmospheric mesoscale model (Weather Research and Forecasting model -WRF) coupled with its chemical module (CHEM) in order to study the simulation of the dispersion of exhausted gas released from a typical rockets (in this case the Satellite Vehicle Launcher characteristics was used) from the Alcantara Launch Center (ALC). For the initialization of the coupled model, the preprocessor PREP-Chem was assigned to the Reanalysis of the TROpospheric chemical composition (RETRO). However, as this repository has no pollutants at the ALC area, a new method of insertion of chemical data assigned to the exact geographical position where the VLS is launched was used with all emissions null unless at the Launcher pad. Also, the model was initialized with meteorological data extracted from the Global Forecasting System (GFS). The simulations were made for different 4 cases representatives of the diurnal (daytime and nighttime) and seasonal (dry and wet seasons) scales. Observational data (radiosondes and wind tower data) was used to validate the wind field. There are 3 grids nested with 9, 3 and 1 km spatial resolution and the model has 45 levels in the vertical (15 levels up to 2000 m). All the simulations showed approximately the same patterns as the wind flow are very persistent (this is a characteristic of the trade winds). Typically, the simulations showed that the CO concentration (the variable used to represent the gases exhausted by the solid motors) at the launch pad is 2 order of magnitude higher than at the gate (1 km far) and 4 order of magnitude higher than Alcantara village (20 km far). It can reach 30000 ppm at the launching pad after Ho + 1 min. Also, it was computed that the launch pad must stay isolated by 15 min before any other action for the complete dispersion and, consequently, for safety reasons. As the turbulent intensity is higher at 12 UTC (daytime conditions), the total time for the complete dispersion of the plume is reduced (around 40-45 min) related to the nighttime conditions (60-75 min). This is an ongoing work that aims to improve this model configuration to include a vertical distribution of the exhausted gases due to the normal launching and to include small scale features at the scale of 100 m. In the near future, this model should be operational for the launchings at ALC.
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机译：本研究旨在使用大气中尺度模型（天气研究和预报模型-WRF）及其化学模块（CHEM），以研究对典型火箭（在本例中为卫星）释放的废气扩散的模拟。使用了Alcantara发射中心（ALC）的“车辆发射器”特性。为了初始化耦合模型，将预处理器PREP-Chem分配给对流层化学成分（RETRO）的重新分析。但是，由于该存储库在ALC区域没有污染物，因此使用了一种新的插入分配到VLS确切地理位置的化学数据的方法，除非在Launcher发射台，否则所有排放都为零。此外，该模型还使用从全球预报系统（GFS）中提取的气象数据进行了初始化。针对白天（白天和夜间）和季节性（干湿季）量表的4种不同代表进行了模拟。观测数据（无线电探空仪和风塔数据）用于验证风场。有3个网格嵌套，分别具有9、3和1 km的空间分辨率，并且模型在垂直方向上具有45个级别（直到2000 m时有15个级别）。所有模拟都显示出大致相同的模式，因为风流非常持久（这是商风的特征）。通常，模拟显示，发射台处的CO浓度（用于表示固体发动机排出的气体的变量）比闸口处（远1公里）高2个数量级，比Alcantara高4个数量级。村（相距20公里）。 Ho + 1分钟后，它在发射台处可达到30000 ppm。此外，据计算，为了完全分散，因此出于安全原因，发射台必须在任何其他动作之前保持隔离15分钟。由于在12 UTC（白天条件）下湍流强度较高，与夜间条件（60-75分钟）相关，羽流完全分散的总时间减少了（约40-45分钟）。这是一项正在进行的工作，旨在改进此模型的配置，以包括由于正常发射而产生的废气的垂直分布，并包括100 m规模的小规模特征。在不久的将来，该模型应可用于ALC的发射。
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