Effect of Wind Speed on the Measurement of Rainfall

風速對降雨量量測之影響

徐森雄(Sen-Hsiung Hsu) ； 郭玉麟(Yuh-Lin Guo)

《作物、環境與生物資訊》 2卷1期 (2005/03) Pp. 81-86

https://doi.org/10.30061/CEB.200503.0008

摘要

本研究之主要目的在探討降雨量量測受風速之影響，於國立屏東科技大學教學氣象站內，設置五口式雨量計與一般水平口式雨量計，比較分析二者降雨量之差異，期能確實掌握提高降雨量量測上之準確性。經資料收集及分析結果可摘列如下：風速愈大，降雨強度愈小，則雨量量測的短少率愈大。颱風之觀測資料中風速與降雨強度之相關均達1%顯著水準，顯示以間隔10min之資料來分析，較能顯示颱風時降雨與風速之關係。降雨強度10mm hr^(-1)以上，平均風速達2m s^(-1)時降雨短少率為4%；平均風速達10 m s^(-1)時降雨短少率為17%。颱風侵襲，平均風速達10m s^(-1)時降雨短少率約為19%；平均風速達18m s^(-1)時降雨短少率約為43%。

關鍵字

降雨量觀測 ； 五口式雨量計 ； 水平口式雨量計 ； 平均風速 ； 降雨短少率

並列摘要

The purpose of this study was to investigate the effect of wind speed on the measurement of rainfall. The study site was set up at meteorological station of National Pingtung University of Science and Technology, in which a five-opening directional raingauge and a standard raingauge were installed. The differences between rainfall measurements of both raingauges were compared and analyzed to verify the accuracy of rainfall measurements. Results were summarized as follows: 1. The rainfall loss rate increases when the wind speed increases and/or rainfall intensity decreases. 2. The analysis of every 10 minutes records can advise the ralation between rainfall intensity and wind speed during a typhoon. 3. When rainfall intensity was above 10 mm hr^(-1), and average wind speed reached 2 m s^(-1), the rainfall loss rate was about 4%. The rainfall loss rate was about 17%, when the average wind speed reached 10 m s^(-1). 4. During the typhoon, the rainfall loss rate was about 19% when the average wind speed reached 10 m s^(-1). The rainfall loss rate was about 43% when the average wind speed reached 18 m s^(-1).

並列關鍵字

Rainfall measurement ； Five-opening directional raingauge ； Standard raingauge ； Wind speed ； Rainfall loss rate