1949年长江流域大洪水分析

Analysis on big flood along Yangtze River basin in 1949

1949长江流域 6月～ 9月持续降雨 ,上游降雨总量超过中下游 ,有些测站为实测以来最大 ,洪水过程包括多次洪峰。长江干流洪峰流量较一般 ,但其长历时洪量和年径流量较为稀遇。上游来水比重大 ,宜昌以上 30 d总入流占汉口以上的 2 / 3以上。

In 1949, from June to September, rainfalls lasted for a long time in Yangtze river basin The total rainfall depth in upper reaches was larger than that in the lower Flood process included many flood peaks Peak discharges at the stations along the Yangtze river were ordinary, but the flood volumes with long duration and annual runoff were rare Main flood volume was produced in upper reaches and the 30 days total inflow proportion of Yichang to Hankou was greater than Flood disasters took place mainly in middle and lower reaches