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題 名 | 以AnnAGNPS推估集水區泥砂產量可行性之研究=A Study of Feasibility for Watershed Sediment Estimation by Using AnnAGNPS |
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作 者 | 林昭遠; 劉建昌; 林家榮; | 書刊名 | 水土保持學報 |
卷 期 | 41:3 2009.08[民98.08] |
頁 次 | 頁257-270 |
分類號 | 436.124 |
關鍵詞 | 泥砂產量; AnnAGNPS; RUSLE; Sediment yield; |
語 文 | 中文(Chinese) |
中文摘要 | AnnAGNPS 由美國農業部的農業研究中心(USDA-ARS)與自然資源保育中心(NRCS)共同 研發,模式以RUSLE 為架構且以不規則網格作為分析單元。AnnAGNPS 以臨界來源面積(CSA) 及最短來源渠道長度(MSCL)作為分析集水區中水系分布及分析單元之依據。在國外已適用多 年,而對於推估台灣地區集水區泥砂產量之可行性,則需進一步探討。本研究以AnnAGNPS 探討模式門檻值設定之合理性及推估大湖集水區泥砂產量。結果顯示,基於參數空間大小以水 系密度運用試誤法推估合適門檻值,以臨界來源面積(CSA)為50ha,最短來源渠道長度(MSCL) 為350m 可獲得較精確之水系;泥砂產量推估部份:全年泥砂推估值與實測值驅於吻合, R2=0.97;單場模擬事件泥砂推估值與實測值平均誤差為71.65%,尤以單日及降雨量較小之場 次,較無法精確之推估。 |
英文摘要 | AnnAGNPS model with the module of RUSLE to simulate watershed sediment yield was developed by USDA-ARS and NRCS for several years. There is a need to study the feasibility of its application in Taiwan. This research employed the model to determine the reasonable stream network threshold using Critical Source Area (CSA) and Minimum Source Channel Length (MSCL), and then simulate the sediment yield at Da Hu Creek Watershed. The results show that there is a good fitting with real stream network under the threshold of CSA=50ha and MSCL=350m. The annual sediment yield simulation is highly correlated with the observed data (R2=0.97). Single event such as daily precipitation will result in a worse result. The model is recommended not to be used at the short periods since the average relative error will be up to 71.65%. |
本系統中英文摘要資訊取自各篇刊載內容。