The large scale circulation situation, mesoscale convergence line and orographic action provided advantage condition for local large heavy rain. 在大尺度环流形势下，中尺度辐合线和地形作用为局地大暴雨提供了有利条件。
The relationship between the scale and the wavelength is given, and a natural annal flow time series in the upper reach of the Yellow River is analyzed. 文中给出基于尺度能量参数的子波变换中尺度与波长的关系，并且分析了一组黄河上游年径流量数据。
