Numerical Simulation of a Heavy Rainfall Event over Huaihe Valley
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Abstract:
Numerical simulation is made on the heavy rainfall over the Huaihe valley on 3 to 4 July 2003 using the PSU/NCAR MM5 model. It is revealed that the MM5 model performed quite well in simulating and can provide highresolution data for diagnosis. The mesoαscale and mesoβscale convective systems of about 100 km can be simulated out by the MM5 model, but the model has a limited capability in simulating the mesoβ(γ)scale systems of smaller scales or more strongly developed systems. The direct reason of the heavy rainfall event is the rapid development of the about 100 km long mesoβscale convergence zone at the lower levels, which is validated by the highresolution data provided by the MM5 model. The mechanisms and the 3D structure of the mesoscale convergence zone are obtained by the diagnostic analysis of the physical quantity field characteristics.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.