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標題: Stormflow Hydrograph Estimation with Antecedent Precipitation Index Model for A High Elevation Forested Watershed in Central Taiwan
作者: 黃良鑫
Hwang, Liang-Shin
關鍵字: stormflow
experimental watershed
antecedent precipitation index (API) model
出版社: 水土保持學系
摘要: 中 文 摘 要 水文分析是水資源及集水區保育經營規劃不可或缺的重要工作之一,水文模式常被用來推估對無流量資料集水區的洪峰和流量歷線。 本研究是以一結構簡單的臨前降雨參數模式,探討中台灣高海拔森林地區地形是否亦可適用,以提供無實測流量資料地區,推估類似地形及面積的上游森林集水區暴雨流量歷線。主要選擇林業試驗所蓮華池分所畢祿溪11號試驗集水區自1987年至1993年間共16場暴雨之水文資料來模擬,所得之結果其可靠性尚可接受。 本模式共使用四個參數,K、X、I、S,K為退水係數,X、I、S分別為其迴歸關係式之指數與截距斜率係數,在暴雨逕流推估方面,其代表參數分別為,大於100mm降雨量群之X=0.5、K=0.95、I=0.56、S=0.0073,與小於100mm降雨量群之X=0.4、K=0.95、I=0.35、S=0.0035。 關鍵字:暴雨流量、畢祿溪、試驗集水區、臨前降雨參數模式。
Abstract The objective of this study is to test the reliability of the antecedent precipitation index (API) model in estimating stormflow hydrographs of high elevation upstream forested watershed in central Taiwan. API model is a simple structured and deterministic model mainly used for simulating continuous streamflow hydrograph from ungauged watersheds. Four parameters are involved in the API model, namely streamflow recession coefficient (K), intercept (I), slope (S) and exponent (X) of API rainfall-runoff relationship. Sixteen storm events with observed hourly streamflow and rainfall records from Piluchi Experimental Watershed No. 11 of Taiwan Forestry Research Institute were used as the hydrologic input data for API model. The results indicated that the simulated hydrographs are rather matched to the observed hydrographs. In addition, when K=0.95, X=0.5, I=0.56, S=0.0073 and K=0.95, X=0.4, I=0.35, S=0.0035 gave best simulation for rainfall less than and over 100mm storms, respectively. This proves that the API model is reliable for using in upstream watersheds in Taiwan. Keyword : stormflow, Piluchi, experimental watershed, antecedent precipitation index (API) model
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