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  全国近500国家观测站极大风破纪录

  此次大风为何这么强?

  近几天,全国出现极端大风天气。4月12日,大风天气进入核心影响时段,全国共有近500个国家气象观测站极大风破纪录,华北、黄淮等地风力尤为强劲,河南、北京、天津等局地的极大风速一度达到或超过13级。

  大风不仅强劲,扩展速度也十分迅速,江南多地也受到大风的影响。

  这次大风为何如此强劲?扩展速度为何这么快?未来还将持续多久?中国天气网一一为你解读。

  大风究竟有多强?

  监测数据显示,11日15时至12日15时,全国共有493个国家观测站打破4月同期极大风纪录,其中河北、河南两地的风力尤为强劲,河北有95个站点、河南有61个站点大风破纪录。京津一带风力也十分强劲,其中天津蓟州区盘山站风力一度达到14级,突破1951年来历史同期极值;12日上午北京门头沟高山玫瑰园极大风速一度达到45.8米/秒(14级),浅山区房山产业园39.0米/秒(13级)、延庆区竞速5站37.5米/秒(13级)。

  大风威力不可小觑,受大风影响,截至12日15时,北京超800棵大树被吹倒,30辆汽车被砸;山西、河南等地出现建筑物顶棚、落地窗被吹走的情况。据飞常准民航看板统计,截至12日12时,国内航线取消航班3200余架次,已是今年以来航班取消的最高值。

  大风为何如此强劲?

  为何此次过程的风这么强?中国天气网首席分析师信欣表示,气压梯度大及高空动量下传是造成强风的主要原因。此次过程中,高空冷高压较强,在内蒙古一带地面有温带气旋形成,导致气压梯度加大。冬春季节,当强冷空气撞上实力不俗的暖湿气流,一言不合就能逆时针扭打旋转起来,温带气旋就此诞生。“它就像一个不停旋转的天气陀螺,若恰逢其他天气相配合,就像无形的鞭子反复抽打,使陀螺越转越快,短时间内威力急剧增强,从而产生强风天气,风力最强时程度不亚于台风。”信欣解释。

  此外,高空动量下传还会使风力更强。在春季,高空往往还是冬季的环流形势,等高线密集,高空风速大,当天气晴朗,地表快速被加热后,地表附近的空气受热膨胀上升,在垂直方向形成湍流交换,把高空的大风传导到地面,导致出现地面强风。

  北京13级以上大风出现在哪里?

  监测显示,11日17时至12日15时,北京近6成观测站极大风达9级以上,10级以上大风出现在海淀、朝阳、丰台、石景山、通州、房山、昌平、怀柔、平谷、门头沟、延庆、密云、顺义,全市最大阵风风速为高山站门头沟高山玫瑰园45.8米/秒(14级)。

  每年4月,华北、黄淮出现10到11级的阵风比较常见,超过12级的大风并不多见。此次过程,北京13级以上大风出现在门头沟和房山等地。这些地方海拔较高,受“狭管效应”影响更易出现极端大风。

  狭管效应的产生主要跟地形有关,大风从开阔地带流入狭窄地形(峡谷)时,由于空气质量不能大量堆积,于是加速流过峡谷,风速增大。城市中高楼密集地区也容易出现此种情况,当刮起六七级大风时,狭管效应能使通过高楼之间的瞬间风力达到12级,从而造成广告牌、玻璃甚至墙体掉落。

  为何大风一夜之间迅速南下?

  此次冷空气带来的大风不但十分强劲,扩展的速度也极快,一夜之间迅速南下,12日15时前后大风前沿已抵达南岭一带。

  信欣介绍,大风影响速度迅速扩展跟冷空气移速有关,此次冷空气过程中,北方高空槽较深,高空引导气流十分强劲,导致地面冷高压迅速向南推进,从而大风影响迅速席卷大江南北。

  12日湖北、上海、浙江等地也受到冷空气南下的叠加影响,出现强劲大风,局地极大风力超10级。信欣介绍,受大风天气影响,南方多地还出现了沙尘天气,云南、贵州、广西等地多地PM10浓度增高,江南多地空气质量指数爆表,南昌12时PM10浓度达到了1240微克/立方米,十分少见。

  大风还会刮多久?

  预计随着冷空气影响逐渐结束,13日,南方的大风就会逐渐减弱。但北方的大风还将持续,随着地面气旋和高空冷涡东移,冷涡后部持续有偏北气流南下,内蒙古中部、河北北部、北京西部和北部山区等地局地阵风可达10至11级。

  中国天气网提醒相关地区公众继续做好防范,居家关好门窗,固定临时搭建物,尽量减少外出,避免在户外大型广告牌、大树下停留,汽车也停到相对空旷的场地或地下车库,防止被高空坠物或树木砸到。(中国天气网)

  专家解读

  狭管效应下

  摩天大楼和老旧建筑

  哪个更危险?

  面对大风天气,很多网友在网上发布提醒称,要避开各种“风口”和容易发生物品脱落的建筑物。4月11日,有气象专家接受记者采访时表示,老百姓一般所说的大风天气里的“风口”,其实是由“狭管效应”所形成的风比较大的区域,在城市中一般两栋相距较近的高层建筑间容易形成此类“风口”。

  中国气象局相关专家表示,这次大风天气让很多人注意到了“狭管效应”这个词,“狭管效应”简单说就是当比较大的气流在通过较为狭窄的地方时,由于堵塞所产生的局部风力增大。“就好比水槽排水的时候,出水口周围的水流肯定是最急的。”该专家表示,在大风天气,类似山口及城市中高层建筑之间距离较近的地方,比较容易出现“狭管效应”,因此大风天气里要避免从这类地方通行。

  有些网友担心,现在城市里有很多摩天大楼,像北京就有高度超过500米的建筑。这样的建筑在极端大风天气里会不会发生晃动、会不会有危险?

  对此,北京一家建筑设计院的副总工程师佟先生告诉记者,这种担心是没有必要的。现在的摩天大楼,尤其是近些年新建的超高层建筑都会有阻尼装置,专门用来防风防震,在设计和建造时都会考虑极端天气情况,大风是不会对这类建筑造成威胁的。“像高度超过300米的建筑,大风天里位于高层的人可能会感到轻微晃动,但是不用担心安全问题。”

  对于高层建筑采用的玻璃外墙是否会在大风天气出现脱落的问题,佟先生表示,一般的摩天大楼等高层建筑安全系数是比较高的,采用的玻璃幕墙等也是非常成熟的技术,几乎不会发生脱落。“反而是一些相对老旧的建筑,哪怕是低层建筑,也需要在大风天气注意空调外机、保温层等的脱落风险,如果一定要外出,还是要尽量避开这类建筑。”

  成都商报-红星新闻记者付垚

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