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社评“申鹤翻白眼流眼泪流口水”-知识课堂

黄河进入年度封河申鹤翻白眼流眼泪流口水期 为何会出现凌汛灾害?

来源: IT之家
2024-12-16 03:24:33

最佳回答

“申鹤翻白眼流眼泪流口水”黄河进入年度封河申鹤翻白眼流眼泪流口水期 为何会出现凌汛灾害?

  14日下申鹤翻白眼流眼泪流口水午,水利部黄河水利委员会发布消申鹤翻白眼流眼泪流口水息,黄河进入年度封河期。

  受强冷空气影响,12月14日16时,黄河内蒙古土默特右旗贺成全村河段今冬首次封河,封冻长度累计约1公里,水利部黄河水利委员会宣布,黄河进入2024—2025年度封河期。

  水利部黄河水利委员会水旱灾害防御局副局长 张乐天:今年11月下旬和12月上旬,黄河内蒙古河段平均气温整体较常年偏高,流凌时间长,封河时间偏晚11天。

  黄河水利委员会将密切关注天气形势和封河发展动态,加强监测巡测,科学调度水库,做好随时应对突发险情和灾情的各项工作,确保黄河防凌安全。

  黄河为何会出现凌汛灾害?

  每年的黄河凌汛都有三个阶段,分别是流凌期、封河期、开河期。黄河凌汛灾害主要发生在封河期和开河期。

  一年中黄河首次发生流凌后,随着气温持续下降,河面上的冰花、冰块越来越多,强度和面积也越来越大。

  当流凌密度达到一定程度后,流冰所受的阻力大于水流的输移力时,大量流冰会在弯道、分汊、浅滩、河道束窄处卡堵、滞留,容易造成冰塞壅水,从而形成凌汛灾害。

  黄河出现首凌后,就正式进入凌汛期,黄河水利委员会每年也会在这个时候,启动防凌运行机制,做好应对突发凌情的工作。

  (央视新闻客户端 总台记者 梁丽娟 张琪)

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