- 期刊
近十年蘭陽溪集水區降雨沖蝕指數推估公式之建立及空間分析之探討
Establishment of the Assessment Model of Rainfall Erosivity and Their spatial distribution in Lan-yang Watershed during the Recent Decade
摘要
近年來因為極端降雨事件發生頻率的增加及降雨特性的改變，導致通用土壤流失公式(universal soil loss equation, USLE)中的降雨沖蝕指數(rainfall erosivity index, R)亦隨之改變，間接影響土壤沖蝕量的估算。本研究以蘭陽溪集水區為研究區域，利用12 個雨量站2002-2012 年的10 分鐘雨量資料，透過迴歸分析方法，建立該集水區之月、季及年降雨量及降雨沖蝕指數關係式，並利用地理資訊系統繪製蘭陽溪集水區年平均降雨量及降雨沖蝕指數等值圖。研究結果發現，12 個雨量站之年降雨量與年降雨沖蝕指數的相關性相當好，其中有11 個雨量站兩者的相關係數均大於0.7。空間分布方面，年平均降雨量與年平均降雨沖蝕指數的變化趨勢大致相似，均以東南方的古魯與太平山雨量站為最高。本研究成果可提供給相關單位作為日後使用之參考依據。
並列摘要
The increased frequency of extreme rainfall events and changes in rainfall characteristics in recent years have changed the rainfall erosivity index of the Universal Soil Loss Equation, thereby indirectly affecting the estimation of soil erosion. In this study, Lan-yang Watershed was used as the research site. By using 10-min rainfall data of 12 precipitation stations of the period between 2002 and 2012, we conducted regression analysis to establish the relationship between monthly, seasonal, and annual precipitation and the rainfall erosivity index of Lan-yang Watershed. A geographic information system was employed to plot the average annual precipitation and rainfall erosivity index isogram of Lan-yang Watershed. The research results indicate that the annual precipitation and annual rainfall erosivity index of the 12 precipitation stations are positively correlated. Among the 12 stations, 11 exhibited a correlation coefficient higher than 0.7. Regarding spatial distribution, the variation tendencies of average annual precipitation and average annual rainfall erosivity index were nearly identical. The highest value of precipitation and rainfall erosivity index was measured at the Gulu and Taiping Mountain Stations at the southeastern area of Lan-yang Watershed. The results of this study can serve as a helpful reference for relevant institutes and departments.
延伸閱讀
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