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  • 云南民族大學學報(自然科學版)

    2021, v.30;No.127(03) 290-297

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    基于AMDAR資料的鋒區飛機顛簸高發區特征研究
    Characteristics of the high-incidence area of aircraft turbulence in the frontal zone based on AMDAR data

    張啟凡;王永忠;裴柯欣;王圣堂;
    ZHANG Qi-fan;WANG Yong-zhong;PEI Ke-xin;WANG Sheng-tang;School of Air Traffic Control, Civil Aviation Flight University of China;

    摘要(Abstract):

    飛行安全一直是人們所關注的問題,飛機顛簸是飛行中常會發生的安全問題,而冷鋒天氣系統下運行常常會伴隨著嚴重的顛簸,故研究區中飛機顛簸的特征和預報方法對航空安全具有重要的意義.首先采用合成分析的方法對冬季澳洲冷鋒時空分布特征進行研究再對15次冷鋒事件進行分析并確定出鋒區的位置,繪制鋒區空間結構圖.將重度顛簸數據與鋒區空間位置對應后得到重度顛簸點的高發區位置.進一步探尋鋒區顛簸機制,繪制鋒區位溫度梯度圖,發現重度顛簸最密集區位于位溫垂直梯度大值區內,此區域內存在較強的重力波.同時,在西風急流帶南側顛簸密集區內水平流場存在較大的氣旋性切變,且垂直速度的水平梯度大值區位于0值區附近,此區域內存在次級環流,冷氣團與暖氣團的抬升與下沉運動最強烈.流場中隨著切變速度增加Richardson數減少,Reynolds增加,持續的擾動導致該區域內較強的重力波不穩定碎變,失去穩定性的重力波從而轉化為能量較高的湍流導致飛機產生嚴重顛簸.考慮鋒區內湍流形成的重力波機制,將鋒生過程中的垂直運動作用加入由Ellrod基于鋒生公式推導出的EI指數中,得到EI*指數并繪制顛簸預報圖,經對比驗證EI*指數有較好的預報效果.
    This paper firstly uses the method of synthetic analysis to study the spatial and temporal distribution characteristics of the Australian cold front in winter, then analyzes 15 cold front events to determine the location of the front area, and draws a map of the spatial structure of the front area. Comparing the data of severe turbulence with the spatial position of the frontal area, the location of the high-incidence area of the severe turbulence point is obtained. It then explores the mechanism of frontal zone turbulence, draws a map of the temperature gradient of the frontal location, and finds that the densest area of severe turbulence is located in the large value area of the vertical gradient of potential temperature, and there is a strong gravity wave in this area. At the same time, there is a large anticyclonic shear in the horizontal flow field in the turbulence-intensive area on the south side of the westerly jet belt, and the large value area of the horizontal gradient of the vertical velocity is near the zero value area. There is a secondary circulation in this area. The cold air mass and the warm air mass in this area rise and fall. The sinking motion is the strongest. As the shear velocity increases in the flow field, the Richardson number decreases, and the Reynolds increases. The continuous disturbance causes the strong gravity waves in the area unstable and broken, and the unstable gravity waves are converted into higher energy. The turbulence could cause severe turbulence in the aircraft. Considering the mechanism of gravity wave formed by the turbulence in the frontal zone, the vertical motion effect in the frontogenesis process is added to the EI index derived by Ellrod based on the frontogenesis formula to obtain the EI* index and draw the turbulence forecast map. The EI* index is verified by comparison to prove its good forecasting effect.

    關鍵詞(KeyWords): 飛行安全;重度顛簸;冷鋒鋒區;時空分布特征;重力波;EI*指數
    flight safety;severe turbulence;cold front area;temporal and spatial distribution characteristics;gravity waves;EI* index

    Abstract:

    Keywords:

    基金項目(Foundation): 中國民用航空飛行學院科研創新基金項目(X2020-27)

    作者(Author): 張啟凡;王永忠;裴柯欣;王圣堂;
    ZHANG Qi-fan;WANG Yong-zhong;PEI Ke-xin;WANG Sheng-tang;School of Air Traffic Control, Civil Aviation Flight University of China;

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    DOI:

    參考文獻(References):

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