四川“81.7”特大暴雨和西南涡的数值模拟

NUMERICAL SIMULATIONS OF EXTREMELY INTENSE RAINSTORM AND SOUTHWEST VORTEX OVER SICHUAN IN JULY OF 1981

中文摘要:

      本文利用复杂地形条件下嵌套细网格预报模式、由欧洲中心的格点资料,设计了六组不同的模拟试验方案,对1981年7月11-15日四川大暴雨及西南涡过程进行了48小时数值模拟。结果表明,本模式较好地预报了这次大暴雨及西南涡过程。对这次西南涡及暴雨过程的发展,凝结潜热有最重要的影响,青藏高原地形的阻挡作用也有重要影响,地面感热和潜热通量、地面摩擦及边界层内的侧向摩擦对西南涡的发展、上升运动和降水的加强也有一定的贡献。

英文摘要:

      In this paper using a nested fine mesh model over complex topograph and the ECMWF's grided point data of 2.5°×2.5°in July of 1981,the,sih sets of numerical experiment schemes of with and without types were designed and their 48-hour numerical simulations of the extremely intense rainstorm and soutawest vortex in Julv of 1981 were run.The results of numerical simulations show that the model has a quite good performace for forecasting of heavy rain and southwest vortex.In the developing of the heavy rainstorm and southwest vortex in July of 1981,the release of latent heat of precipitation plays the most important rule,the effect of barrier of Tibetan Plateau has an important rule,and the fluxes of surface sensible and latent heat,surface friction and lateral friction in boundary layer have a certain contributions to the development of southwest vortex,intensifing of upward motion,and the heavy rainfall as well.