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  3. 學習啦>知識大全>知識百科>安全知識>《外出時遇到龍卷風應該應該如何自救?》正文

    外出時遇到龍卷風應該應該如何自救?

    時間:2019-08-31 17:19:51本文內容及圖片來源于讀者投稿,如有侵權請聯系xuexila888@qq.com 永強 我要投稿

      龍卷風是一種常見的自然災害現象。我國沒有單獨針對龍卷風的預警,所以對普通民眾來說,應該掌握相關防御知識,才能在遭遇災害時有效開展自救互救。那么外出遇到龍卷風應該如何自救呢?

      什么是龍卷風?

      龍卷風是大氣中最強烈的渦旋的現象,常發生于夏季的雷雨天氣時,尤以下午至傍晚最為多見,影響范圍雖小,但破壞力極大。

      龍卷風經過之處,常會發生拔起大樹、掀翻車輛、摧毀建筑物等現象,它往往使成片莊稼、成萬株果木瞬間被毀,令交通中斷,房屋倒塌,人畜生命和經濟遭受損失等。

      龍卷風形成條件

      龍卷風這種自然現象是云層中雷暴的產物,具體的說,龍卷風就是雷暴巨大能量中的一小部分在很小的區域內集中釋放的一種形式。

      龍卷風的形成可以分為四個階段:

      (1)大氣的不穩定性產生強烈的上升氣流,由于急流中的最大過境氣流的影響,它被進一步加強。

      (2)由于與在垂直方向上速度和方向均有切變的風相互作用,上升氣流在對流層的中部開始旋轉,形成中尺度氣旋。

      (3)隨著中尺度氣旋向地面發展和向上伸展,它本身變細并增強。同時,一個小面積的增強輔合,即初生的龍卷在氣旋內部形成,產生氣旋的同樣過程,形成龍卷核心。

      (4)龍卷核心中的旋轉與氣旋中的不同,它的強度足以使龍卷一直伸展到地面。當發展的渦旋到達地面高度時,地面氣壓急劇下降,地面風速急劇上升,形成龍卷風。

      注:科學家經過多年的龍卷風觀測發現,陸龍卷多發生在高壓線設施附近,或將成為誘發龍卷的原因之一。

      龍卷風具有哪些特點?

      1、季節性明顯

      龍卷風常發生于夏季的雷雨天氣時,尤以下午至傍晚最為多見。

      2、持續時間短

      龍卷風的生存時間一般只有幾分鐘,最長也不超過數小時。

      3、移動速度快

      龍卷風中心附近的風速可達100-200米/秒。

      4、襲擊范圍小

      龍卷風的直徑一般在十幾米到數百米之間。

      5、破壞力極強

      龍卷風經過的地方,常會發生拔起大樹、掀翻車輛、摧毀建筑物等現象,有時把人吸走,危害十分嚴重。

      龍卷風能否事先預報?

      龍卷風會在特別強對流天氣里出現,由于龍卷風發生至消散的時間很短,影響面積也很小,現有的探測儀器沒有足夠的靈敏度來對它進行準確觀測。

      相對來說,多普勒雷達是比較有效和常用的一種觀測儀器,如果龍卷風持續的時間稍長,多普勒雷達探測到,操作人員可以分析、計算出龍卷風的速度和移動方向。但是多數龍卷風持續的時間比較短,監測到時,龍卷風可能已經發生完。

      據了解,在國外,還有通過有經驗或經過培訓的人員報告的方式,來預報龍卷風的途徑。

      外出遇到龍卷風應該如何自救?

      1、在野外遭遇龍卷風時,記住要快跑,但不要亂跑。應以最快的速度朝與龍卷風前進路線垂直的方向逃離。來不及逃離的,要迅速找一個低洼地趴下。正確的姿勢是:臉朝下,閉上嘴巴和眼睛,用雙手、雙臂保護住頭部。

      2、遇到龍卷風時,一定要遠離大樹、電線桿、簡易房等,以免被砸、被壓或觸電。

      3、在公共場所,應向指定地點疏散。最好的掩蔽場所是低洼的地方。

      4、如果在汽車中遇到龍卷風,這是非常危險的,應立即把汽車停在低洼的地方,人離開汽車,迅速找一個與龍卷風路徑垂直的低洼地隱蔽或伏于地面,最好能快速撤離到涵洞、隧道等安全場所。在野外尋找安全場所時一定要遠離大樹、電桿,以免被砸、被壓和觸電。千萬不要開車躲避龍卷風。據調查表明,汽車遇到龍卷風,幾乎沒有防御能力,許多人死在行駛的汽車內。

      5、立刻離開橋、高坎、沿海岸及危險房或活動房。如果附近沒有屏障,則應平伏于低洼地面,但要注意防水。

    相關文章:

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    2.2019年中小學生安全知識測試題附答案

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