梅雨锋为初夏影响江淮地区的主要天气系统。该系统持续时间较长，暴雨瞬时强度大，常常会造成洪涝灾害。针对梅雨锋暴雨的研究多集中于其气候学特征、环流背景及水汽输运等方面。对于梅雨锋多尺度特征的研究多采用小波变换法，但其往往只能孤立地分析各个尺度的结构特征，并无法有效地诊断各个尺度子空间之间的能量传输过程。本项目拟从梅雨锋暴雨系统的能量学角度入手，利用局地多尺度能量分析方法，对梅雨锋暴雨特征场进行多尺度正交分解，探讨各尺度子空间之间的能量交互传输过程，并研究多尺度能量转换对暴雨雨量的贡献。项目将揭示梅雨锋暴雨系统中多尺度能量交互转换过程，为今后梅雨锋暴雨的预报和预警提供能量学角度的预测因子。

Meiyu front, which is the main weather system that influences Jianghuai area in the early summer, has a longer duration. The instant strength of the rainstorm is huge and it always leads to a flood disaster. Meiyu front studies are mainly focused on its climatological aspects, its circulation situation and water vapor transportation. The multi-scale feature of Meiyu front is usually studied with wavelet transform, which can only analyze the structural characteristics of each scale individually, while the energy transfer process between scale subspaces cannot be diagnosed. This project intends to analyze the Meiyu front rainstorm system using the multiscale window transform (MWT) and the MWT-based multiscale energy analysis. The energy transfers between scale subspaces and the buoyancy conversion to rainstorm rainfall will be discussed, in order to provide an energy prediction factor for the forecast and to issue in-advance alarm of Meiyu front rainstorm.