【摘要】 通过对柳江流域历年25个致洪暴雨过程进行统计分析,发现柳江流域致洪暴雨主要发生于6~7月,20世纪90年代后柳江致洪暴雨的发生频率和强度都有增加的趋势,柳江东北部流域和西部流域是柳江洪水的主要来源地,分析还发现柳江致洪暴雨的主要影响系统有高空槽(南支槽)、低涡、低层切变线、地面静止锋、低空急流、副热带高压等6种,可分为低槽切变类、低涡切变类和低空急流切变类三种类型。更多还原

【Abstract】 This paper conducts the statistical analysis for the 25 rainstorm processes causing flood in Liujiang River in the previous years,and finds that the rainstorm mainly occurs in June and July,after 90′s,the frequency and intensity of the rainstorm have the tendency to go up.The river basin of the northeast and the west of Liujiang are the main origin place of flood.The analysis also discovered that the major systems of the rainstorm include the upper-air trough,the shear line of low-layer,the ground stationary front,the low altitude jet stream and the subtropical high etc,and these systems may be dividled into three kind of types:the low trough and shearline line,the vortex and shearline line,the low altitade jet stream and shearline line.更多还原