Study on scheme of snow enhancement by ground-based flare seeding system
Using the WRF numerical model,the minimum height Hx required for the activation of the catalyst was calculated based on the forecast meteorological elements.The Gaussian plume model was employed to calculate the effective diffusion height Hkm of the catalyst concentration.A comparative analysis of the relationship between Hx and Hkm was conducted to explore and study the operational schemes of the ground-based broadcasting system.The results show that when using the WRF numerical model,the Lin-YSU-KF combination scheme has the best correlation with the observed precipitation,and the simulated cloud areas,temperature,and relative humidity are consistent with observational data.This scheme can be used to forecast the characteristic temperature layer height and cloud base height required for snow enhancement operations,and to determine the minimum height required for the catalyst to be effective.The study of the diffusion distribution using the Gaussian plume model indicates that burning multiple flares simultaneously can significantly increase the effective diffusion height within the same time period;when the total number of flares is the same,the diffusion center concentration and effective diffusion height are relatively similar.The more flares burned simultaneously,the higher the effective diffusion height.Comparing calculated Hx and Hkm can be used to determine the timing of snow enhancement operations and to choose appro-priate operational schemes.
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