English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 80990/80990 (100%)
造訪人次 : 43105765      線上人數 : 636
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/42274


    題名: 雷達定量降水預報研究---子計畫:都卜勒雷達診斷資料在即時天氣預報之應用(I);The Application of Doppler Radar Diagnostic Data in Nowcasting (I)
    作者: 廖宇慶
    貢獻者: 大氣物理研究所
    關鍵詞: 都卜勒雷達;VAD;徑向風折疊;Doppler radar;VAD;radial velocity aliasing;大氣科學類
    日期: 2005-07-01
    上傳時間: 2010-11-30 15:36:47 (UTC+8)
    出版者: 行政院國家科學委員會
    摘要: 本計畫屬於一整合型計畫之子計畫。吾人將利用傳統之都卜勒雷達VAD (Velocity Azimuth Display)技術,但將其向下列兩個方向推廣: (1) 傳統之VAD 技術能求出風場、水平輻合/輻散場以及變形場。但結合一回波保守方程後,可再求出渦度場。 (2) 在某特定高度層上,經由計算雷達徑向風沿方位角的梯度以求出風場之垂直剖線。此種推廣可使風場之估計較不受雷達觀測時。徑向風資料被折疊(aliasing)的污染,適合即時作業之要求。上述方法之結果將與雙雷達資料交叉比對以確認其準確度,並經由大量的個案分析統計此風的診斷場與降水強度之關係,並進而發展應用在台灣即時天氣降水預報的技術。 This proposal is part of an integrated project. In this research, the PI will use the traditional Doppler radar VAD technique, but extend its usage in the following two directions: (1) The traditional VAD method derives only the vertical profiles of mean wind, horizontal divergence, as well as horizontal deformation. However, if combined with a reflectivity conservation equation, one can also estimate the parameter of vorticity. (2) By computing the gradients of the radar observed radial velocity with respect to the azimuthal angle, it is also possible to compute the vertical profiles of winds. The advantage of this modification is that the influence of the velocity aliasing to the products can be reduced. This can speed up the computation, and is believed to be useful when the application of VAD method to real-time operations is required. The accuracy of the wind fields derived by the above two methods will be verified by Dual Doppler analyses. It is also planned to conduct a large number of case studies so that the statistical relationship between the diagnostic wind fields and the intensity of the precipitation can be established. Based on this relationship, one can develop the technique used for the nowcasting of Taiwan precipitation. 研究期間:9308 ~ 9407
    關聯: 財團法人國家實驗研究院科技政策研究與資訊中心
    顯示於類別:[大氣物理研究所 ] 研究計畫

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML436檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©  2006-2024  - 隱私權政策聲明