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題 名 | 景美溪集水區年際及豐枯水期水文特性變化之研究=Changes in Hydrological Characteristics during Annual and Wet-Dry Periods in the Jingmei Stream Watershed |
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作 者 | 廖俊瑋; 宋健豪; 詹仕堅; 廖學誠; | 書刊名 | 中國地理學會會刊 |
卷 期 | 54 2015.06[民104.06] |
頁 次 | 頁55-72 |
分類號 | 328.63 |
關鍵詞 | 頻率分析; 極端值一型分佈; 對數常態分佈; 豐枯水期; Frequency analysis; Extreme-value type I distribution; Logarithmic normal distribution; Wet and dry period; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以台北都會區附近的景美溪集水區作為案例,探討研究區年際及豐枯水期的水文特性,並比較前後期不同重現期的降雨量及逕流量之差異。從1970年至2009年間,針對研究區年降雨量、豐枯水期降雨量、年平均逕流量、豐枯水期平均逕流量進行頻率分析,比較極端值一型分佈、對數常態分佈、皮爾森三型分佈及對數皮爾森三型分佈之適切性,並據此探討在氣候變遷情況下,近期水文特性變化之趨勢。結果顯示,不論是年降雨量、豐水期或枯水期降雨量,其機率分佈函數均以極端值一型分佈最佳,至於年平均逕流量及豐水期平均逕流量,其機率分佈函數以對數常態分佈最佳,但枯水期平均逕流量則以極端值一型分佈為宜。此外,在豐水期時,不論是降雨量或逕流量,後期(1987-2009年)均比前期(1970-1987年)明顯增高,相反地,在枯水期時,後期則均比前期低。整體而言,景美溪集水區的降雨量及逕流量均逐漸呈現兩極化現象,豐水期時水量更多,枯水期時水量更少,此現象將不利於未來水資源的經營管理。 |
英文摘要 | The Jingmei stream watershed, located in the Taipei metropolitan area, has been selected as a study area for this research to understand the changes in hydrological characteristics during annual and wet-dry periods and for comparing the differences between rainfall and runoff during different return periods. The annual wet-dry periods' rainfall and annual wet-dry periods' runoff from 1970 to 2009 were analyzed using frequency analysis. Four probability distributions were compared, including extreme-value type I distribution, logarithmic normal distribution, Pearson type III distribution, and logarithmic Pearson type III distribution to study the variation trend of hydrological characteristics under climate change conditions. The results show that the extreme-value type I distribution is suitable for annual rainfall of the wet-dry period, while the logarithmic normal distribution is favorable for annual and wet period average runoff. However, the extreme-value type I distribution is comfortable for dry period average runoff. Moreover, the rainfall and runoff during the wet periods in a late stage (1987-2009) are higher than that in an early stage (1970-1986). In contrast, the rainfall and runoff during the dry period in late stages are lower than that of the early stages. Conclusively, there is a phenomenon of polarization for rainfall and runoff in the study area. The water of rainfall and runoff is more abundant during wet periods, while the water is insufficient during dry periods. This is unfavorable for water resource management in the future. |
本系統中英文摘要資訊取自各篇刊載內容。