黄河三门峡一花园口“82．8”大暴雨期间水汽输送分析

Analysis of Moisture Transport Between Sanmenxia and Huayuankou During the Storm of August

通过计算１９８２年７月２９日～８月２日黄河中游三门峡一花园口间区域的水汽通量、水汽通量散度和水汽净输送等特征量，分析了这次暴雨过程的水汽源地、水汽输送的物理过程和水汽净输送量与暴雨洪水的关系。结果表明，这次暴雨的水汽主要来自东部洋面上，低空偏东风急流和三花间地区的辐合上升运动共同构成了该地区水汽输送的通道，暴雨区内水汽的缔向福合是形成暴雨水汽福合的主要过程，水汽的经向辐散则是水汽输出的主要原因，而水汽的低层辐合、高层辐散及低层水汽向高层的垂直输送是降雨增强的机制。

Through the calculation of moisture flux, divergence of moisture flux, and the net transport of moisture between Sanmenxia and Huayuankou during the storm of August 1982, this paper analyzed the moisture source of these storms and the physical process of moisture transport and the relationship between net moisture transport and flood' Results indicate that the moisture of this storm was produced from the ocean at East of China. The low atitude east jet flow combined with the convergent lifting movement between Sanmenxia and Huayuankou formed the transport channel for moisture in this region. The latitudinal convergence was the main process in forming the storm moisture convergence. The longitudinal divergence was the reason for moisture output' The low atitude moiSture convergence, the high atitude moisture divergence, and the vertical transport of moisture were the mechanism for increasing rainfall.