洞庭湖决口封堵最新现场：封堵已达84米，垸区地势低洼洪水无法完全自排出
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5日下午，湖南岳阳团洲垸（yuàn）洞庭湖一线堤防发生决口，目前决口现场正采取“水陆协同”方式加快封堵。所谓“垸”，指的是一个地势低洼地带，在周围筑起堤坝，形成了“像脸盆一样”的垸区。由于垸区地势普遍较低，积水很难自然向外排出。（央视）
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