南京大学学报（自然科学版）
南京大學學報（自然科學版）
남경대학학보（자연과학판）
JOURNAL OF NANJING UNIVERSITY(NATURAL SCIENCES)
2014年
6期
855-864
,共10页
近海台风%多普勒雷达%自适应定位
近海檯風%多普勒雷達%自適應定位
근해태풍%다보륵뢰체%자괄응정위
typhoon near coast%Doppler radar%adaptive identifying and tracking
本研究提出了近海台风自适应定位方法(typhoon eye adaptive identifying and tracking,TEAIT).该方法主要基于多普勒反射率数据对近海台风的台风眼进行客观的识别和追踪.文中对4个典型台风个例使用 TEAIT 方法进行了定位测试,并将其与基于径向风的 GBVTD-simplex 和基于弱回波的 TCET 方法作比较.相比 GBVTD-simplex方法,因为雷达回波的观测半径要大于径向风,TEAIT方法可以更早的追踪台风.对相同时段定位比较表明,两者中心定位差绝大部分都分布在5 km内.进一步分析表明,差异大主要是在台风路径显著转向或者台风眼剧烈收缩时,此时台风环流中心和回波中心不重合导致.相比同样基于回波的 TCET 方法,TEAIT 方法即便在台风结构不对称、眼不闭合、低层填塞等情况下都能成功定位,而TECT法在这些情形下容易定位失败.TEAIT方法比TECT方法表现出更好地识别和连续追踪能力.
本研究提齣瞭近海檯風自適應定位方法(typhoon eye adaptive identifying and tracking,TEAIT).該方法主要基于多普勒反射率數據對近海檯風的檯風眼進行客觀的識彆和追蹤.文中對4箇典型檯風箇例使用 TEAIT 方法進行瞭定位測試,併將其與基于徑嚮風的 GBVTD-simplex 和基于弱迴波的 TCET 方法作比較.相比 GBVTD-simplex方法,因為雷達迴波的觀測半徑要大于徑嚮風,TEAIT方法可以更早的追蹤檯風.對相同時段定位比較錶明,兩者中心定位差絕大部分都分佈在5 km內.進一步分析錶明,差異大主要是在檯風路徑顯著轉嚮或者檯風眼劇烈收縮時,此時檯風環流中心和迴波中心不重閤導緻.相比同樣基于迴波的 TCET 方法,TEAIT 方法即便在檯風結構不對稱、眼不閉閤、低層填塞等情況下都能成功定位,而TECT法在這些情形下容易定位失敗.TEAIT方法比TECT方法錶現齣更好地識彆和連續追蹤能力.
본연구제출료근해태풍자괄응정위방법(typhoon eye adaptive identifying and tracking,TEAIT).해방법주요기우다보륵반사솔수거대근해태풍적태풍안진행객관적식별화추종.문중대4개전형태풍개례사용 TEAIT 방법진행료정위측시,병장기여기우경향풍적 GBVTD-simplex 화기우약회파적 TCET 방법작비교.상비 GBVTD-simplex방법,인위뢰체회파적관측반경요대우경향풍,TEAIT방법가이경조적추종태풍.대상동시단정위비교표명,량자중심정위차절대부분도분포재5 km내.진일보분석표명,차이대주요시재태풍로경현저전향혹자태풍안극렬수축시,차시태풍배류중심화회파중심불중합도치.상비동양기우회파적 TCET 방법,TEAIT 방법즉편재태풍결구불대칭、안불폐합、저층전새등정황하도능성공정위,이TECT법재저사정형하용역정위실패.TEAIT방법비TECT방법표현출경호지식별화련속추종능력.
In this study,a typhoon eye adaptive identifying and tracking(TEAIT)algorithm which based on radar re-flectivity is developed to obj ectively identify and track the center of typhoon near the coast.Four typical typhoon cases were selected to examine the performance of this method and the results were compared through two operational methods:the GBVTD-simplex(ground-based velocity-track-display)and the TCET(tropical cyclone eye tracking).The former is based on radar radial while the latter is based on weak echo.Since the observation range of reflectivity is larger than radial wind,TEAIT can track typhoon center earlier than GBVTD-simplex.The comparison in the same track period indicates the difference between those two methods is small.Most of center differences are within 5 km.The significant difference was found in the moment when the structure of the typhoon eye changes rapidly.In that case,the center of the wind field is not consistent with the center of reflectivity.Compared to the TCET algorithm which is also reflectivity-based method,the TEAIT algorithm can track the center even in the situation when the structure of typhoon is asymmetrical,or the eye is not closed,or the low level is filled due to the landing process and so on.In contrast,TCET may failed to locate the center in those circumstances.TEAIT can track the center more steadily and continuously than TCET.
