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  • 學位論文

利用氣象雷達探討2014年和2015年秋季灰面鵟鷹在恆春半島的遷移模式

The Use of Weather Radar in Studying Autumn Migration Patterns of Grey-faced Buzzard (Butastur indicus) via Hengchun Peninsula in 2014 and 2015

指導教授 : 孫元勳

摘要


本研究利用墾丁氣象站的都卜勒氣象雷達,分析2014和2015年10月灰面鵟鷹(Butastur indicus)過境恆春半島的路線、數量、結構、時間、飛行高度、飛行速度以及風向扮演的角色,並與地面調查結果比較,看是否有遺漏的情形。2014年雷達記錄了152個鷹群,估算數量共106,697隻,分別由恆春半島西側海域(16%),恆春半島(70%),恆春半島東側海域(14%)過境;2015年紀錄了138個過境鷹群,估算鷹群數量共89,260隻,其中55 %選擇恆春半島西側海域遷移、41%由恆春半島南端遷移,3%選擇恆春半島東側海域遷移。這兩年皆有鷹群從恆春半島西側的枋寮一帶出海,為首度發現。2014年雷達估算地面調查的灰面鵟鷹遺漏量為51,520隻,佔過境總數48 %;2015年雷達估算地面調查遺漏量 54,725隻,佔過境總數61 %。2014年過境時間介於5時至14時,2015年過境時間介於5時至15時。2014年鷹群在進入雷達掃描範圍時的飛行高度下緣介於136.7~1148.9 m,離開雷達掃描範圍時的飛行高度上緣介於133.0~573.6 m;2015年鷹群在進入雷達掃描範圍時的飛行高度下緣介於175.4~691.6 m,離開雷達掃描範圍時的飛行高度上緣介於199.9~629.5 m。2014年飛行速度介於4.3~86.2 km/hr;2015年飛行速度介於10.7~96.4 km/hr。2014年鷹群多在順風時過境,2015年則多在順側風。

關鍵字

墾丁 氣象雷達 遷移 猛禽 灰面鵟鷹

並列摘要


I used Doppler weather radar to analyze the migration patterns such as flyway, flock size, arrival time, flight altitude, flight speed, and the effect of wind condition of Grey-faced buzzards (Butastur indicus) in October 2014 and 2015 via Hengchun Peninsula. I also compared the radar data with ground observations of 2014 and 2015 to examine why the number of Grey-faced buzzard observed declined drastically in 2015. In 2014, radar images showed 152 flocks and the number total of the birds was 106,697. There are 16 % of them flying through the west to Hengchun Peninsula, 70 % flying through Hengchun Peninsula, 14% flying through the west to Hengchun Peninsula. In 2015, radar images showed 138 flocks and the total number of raptors was 89,260. There were 55 % of them flying through the west to Hengchun Peninsula, 41% flying through Hengchun Peninsula, 3 % flying through the west to Hengchun Peninsula. The percent of the buzzards unseen by ground observation in 2014 was 48 %, while that of 2015 was 61 %. The time of passing through the Peninsula was from 5:00 am to 3:00 pm in 2014, and 5:00 am to 2:00 pm in 2015. The lowest flight altitude of the species flying into radar scanning range was 136.7-1148.9 m and that of flying out the scan range was 133.0-573.6m in 2014. The lowest flight altitude of the buzzards was 136.7-1148.9 m and the highest flight altitude was 133.0-573.6 m in 2015. In 2014, the flight speed of the birds was 4.3-86.2 km/hr, and most flew with tailwind, while in 2015, it was 10.7-96.4 km/hr, mostly with laterally tail wind.

並列關鍵字

Kenting Weather radar Migration Raptor Grey-faced buzzard

參考文獻


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