臺灣東部地區降雨沖蝕指數之研究

Study on Rainfall Erosivity Index in Eastern Taiwan

李明熹(Ming-Hsi Lee) ； 郭庭佑(Ting Yu Kuo) ； 莊純宛(Chun-Wan Chuang)

《水保技術》 15卷1期 (2021/03) Pp. 8-23

摘要

近年來臺灣地區極端降雨事件逐漸增加，使得降雨型態與降雨沖蝕指數隨之變化，因此重新修訂降雨沖蝕指數以符合現今氣候狀況為相當重要的議題。本研究蒐集東部地區17年（2002年至2018年）共60個中央氣象局雨量站之10分鐘降雨資料，分析各雨量站之年平均降雨沖蝕指數，建立各雨量站四季（春、夏、秋及冬）、乾濕季及年平均降雨沖蝕指數與降雨量之回歸關係式，估算不同重現期距之降雨沖蝕指數，並繪製降雨冲蝕指數空間分布等值圖，以提供水土保持相關從業人員之參考。

關鍵字

降雨沖蝕指數 ； 回歸關係式 ； 空間分布等值圖 ； 氣候變遷

並列摘要

In recent years, the rainfall characteristics and rainfall erosivity index have changed due to the increase of extreme rainfall events in Taiwan. Therefore, it is an important issue to revise the rainfall erosivity index to conform to the current climate. This study collected 10-minute rainfall data from 60 stations of the Central Weather Bureau in the eastern region for 17 years (2002 to 2018) and analyzed the annual average rainfall erosivity index of each rainfall station. The regression equations between the average rainfall erosivity index and rainfall were established for four seasons (spring, summer, autumn and winter), dry and wet seasons, and each year. The rainfall erosivity index of different return periods was also established. The contour map of the spatial distribution of rainfall erosivity index was drawn. The results of this study can be provided to practitioners related to soil and water conservation as an important reference.

並列關鍵字

rainfall erosivity index ； regression equation ； spatial distribution contour map ； climate change