今年７月份以来，长江发生了自１９５４年以来的全流域性大洪水。此次洪水特点主要表现为：发生早，来量大，水位持续居高不下等，给国家财产和人民生命安全造成严重危胁。长江干流的水位为何一直居高不下，连续出现洪峰，究其原因，主要有以下几点：一、厄尔尼诺现象和拉... Since July of this year, the Yangtze River has experienced a full-scale flood since 1954. The main characteristics of the flood are as follows: early occurrence, large quantities, and persistently high water levels, which pose serious threats to the national property and people’s lives. Why is the water level in the main stream of the Yangtze River always high and there are continuous flood peaks? The reasons are as follows: 1. El Niño phenomenon and pull...