专家解密8月初珠江流域暴雨洪水为何这么大?|女子spa高潮呻吟抽搐
中新网广州8月8日电 (王坚 张媛)珠江流域中东部8月2日至7日遭遇今年入汛以来最强降雨过程,西江、北江、东江干支流出现明显涨水过程,西枝江支流淡水河、东江石马河支流潼湖水等47条河流发生超警洪水。8日,水利部珠江水利委员会(下称“珠江委”)水文专家解密月初本轮珠江流域暴雨洪水为何这么大?
珠江委介绍,此轮强降雨过程具有以下特点:持续时间长,本次降雨自8月2日开始,截至7日14时,已经下了126个小时。累计雨量大,北江、东江累计面平均降雨量分别达177、247毫米,短短5天半下出了超过往年整个8月的降雨量。降雨范围广,广东四分之三区域和广西四分之一区域的累计雨量超过100毫米,合计总面积达19.3万平方公里。
水文专家介绍,通常,珠江流域前汛期(4月—6月)持续性强降雨以锋面雨为主,后汛期(7月—9月)的则以台风雨为主。
那为什么现在没有台风影响,珠江流域还会有极端性如此大的强降雨呢?水文专家表示,其实,高空低涡配合西南季风也是后汛期暴雨的典型天气形势。此次强降雨过程由多个天气系统共同造成的:一是今年副热带高压异常偏北偏大,珠江流域位于副高的一个“豁口”处,西南气流和偏东气流共同作用形成低涡切变,且在流域中东部长时间滞留,提供稳定动力抬升条件;二是低层西南季风气流异常偏强,为强降雨提供了丰沛的水汽。因此,本次强降雨下出了“龙舟水”之气势。
珠江委表示,随着副高逐渐西伸,西南急流减弱西移,此轮强降雨趋于结束,但部分地区近期降雨落区重叠,土壤含水量已经饱和,公众应避免前往山区、河谷等灾害风险较高地区,警惕次生灾害的滞后性。同时,流域部分地区仍可能出现局地强降雨,尤其是一些山区里的中小河流由于落差大流速快,一旦出现局地短时强降雨,容易出现陡涨陡落的突发性洪水,水文部门将继续强化水雨情监测预报,及时发布预警信息。(完)
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