風速對雨量量測之影響（二）

Effect of Wind Speed on the Measurement of Rainfall. Ⅱ

徐森雄(Sen-Hsiung Hsu) ； 陳俐伶(Li-Ling Chen) ； 李冠昌(Guan-Chang Lee) ； 蔡宜君(Yi-Jun Chai)

《作物、環境與生物資訊》 2卷4期 (2005/12) Pp. 308-314

https://doi.org/10.30061/CEB.200512.0006

摘要

本研究之目的在求瞭解降雨受風速之影響，所造成之雨量短少與風速造成降雨角度之變化。依所得資料，分不同降雨強度與風速之強弱，計算其雨量短少率及降雨角度。經分析，平均風速達5ms^(-1)時雨量短少率為24.2%；平均風速達15ms^(-1)時雨量短少率為49.9%，可知當降雨強度一定，風速愈大時，所得雨量短少率愈大。平均風速達5ms^(-1)時降雨角度為23.3°；平均風速達15ms^(-1)時降雨角度為41.1°，當降雨強度一定，風速愈大時，則所得之降雨角度愈大；如此造成之雨量短少率將愈大。

關鍵字

雨量計 ； 風速 ； 雨量短少率 ； 降雨角度

並列摘要

The purpose of this study was to investigate the effects of wind speed upon the measurement of rainfall. The study site was established at the meteorological station of the National Pingtung University of Science and Technology. A five-opening directional rain gauge, standard rain gauge and aero vane type self-recorded device were installed. From August 2000 to August 2004, about 500 events of 10 minutes each record were obtained, and the results were summarized as follows: (1) When the rainfall intensity was constant, the rate of rainfall loss increased when the wind speed increased. When average wind speed reached 5 ms^(-1), the rate of rainfall loss was about 24%. The rate of rainfall loss was about 50% when the average wind speed reached 15 ms^(-1). (2) When the rainfall intensity was constant, the rainfall angle increased when the wind speed increased. And, average wind speed reached 5 ms^(-1), with the rainfall angle at about 23°. The rainfall angle was about 41°, when the average wind speed reached 15 ms^(-1). The rate of rainfall loss was increased when the rainfall angle increased.

並列關鍵字

Rain gauge ； Wind speed ； Rainfall loss rate ； Rainfall angle