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- 水庫集水區植生緩衝帶配置區位及效益評估之研究
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- A Study on the Width and Placement of Vegetated Buffer Strips in a Mudstone-Distributed Watershed
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- Integration of AGNPS and GIS to Predict the Soil Erosion Potential of Li-Yu-Tan Reservoir Watershed
- 結合農業非點源污染模式與地理資訊系統推估土壤沖蝕量之研究
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題 名 | 水庫集水區植生緩衝帶配置區位及效益評估之研究=A Study of Placement and Benefits of Vegetated Buffer Strips in a Reservoir Watershed |
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作 者 | 林昭遠; 賴威任; 莊智瑋; | 書刊名 | 水土保持學報 |
卷 期 | 42:1 2010.03[民99.03] |
頁 次 | 頁15-33 |
分類號 | 436.124 |
關鍵詞 | 植生緩衝帶; 水庫優養化; 農業非點源污染模式; Vegetated buffer strips; Reservoir eutrophication; AGNPS; |
語 文 | 中文(Chinese) |
中文摘要 | 水庫為各類用水之重要來源之一,根據水庫管理局資料顯示,台灣多數水庫優養化及淤積 問題極為嚴重,導致蓄水量不足或水質不佳,如何有效解決水庫淤砂及優養化問題,為目前水 庫集水區經營管理之重大課題。本研究以分布於泥岩區位之阿公店水庫集水區,利用倒傳遞類 神經網路進行影像判釋,量化分析水庫優養化狀況,並以DEM資料萃取集水區植生緩衝帶之最 佳配置區位,另搭配農業非點源污染模式(AGNPS)進行配置效益模擬,探討緩衝帶配置對阿 公店水庫之水質改善效益。依流向計算兩相鄰網格之坡度差值大於20%以上之區位配置植生緩 衝帶,並以皮爾遜10年暴雨頻率年日降雨量374.57mm進行模擬,模擬結果顯示,在土地利用 以農業為主之1號集水區內,以總氮、總磷濃度之減量分別為4.53%與4.04%為最高,其單位配 置面積之減量率每公頃0.16%與0.14%,惟集水區之逕流與泥砂減量率並不明顯。土地利用以泥 岩裸地為主之2號集水區,以泥砂之減量率為10.89%最高,其單位配置面積之減量率每公頃達 0.26%;而總氮之減量率約為6.94%,總磷之減量率約為5.96%,其單位配置面積減量率每公頃 分別為0.17%、0.14%,緩衝帶配置對2號集水區逕流量之改善率亦不明顯。 |
英文摘要 | Water resources operated by the reservoirs are key sources for a variety of water utilization. According to data published from reservoir administration, most of reservoirs in Taiwan have suffered serious eutrophication and/or sedimentation, which led to shortage of water storage and worse water quality. Hence, how to solve the problems has become an important task in reservoir management. In this study, A-kung-ten reservoir watershed located at the mud-stone area was chosen as the research site for exploring the placement and benefits of vegetated buffer strips (VBSs), and with the process of image interpretation using back propagation Neural Network to classify the watershed land use for quantifying the reservoir’s trophic status, the places where gradient difference greater than 20% calculated with receiving drainage cells were designed for the placement of VBS’s, finally the scenario’s benefits were fully discussed by using daily precipitation with the occurrence of 10-year period simulated in AGNPS. Results show that there is a principal decrease in both the concentration of total nitrogen (4.53%) and total phosphorus (4.04%), some 0.16% and 0.14% decreasing rate for placement efficient of VBS’s per unit hectare, respectively; however, there is no significant difference in runoff and sediment yield at No1 watershed which having a dominant land use in agriculture. No2 watershed with plenty of mud-stone bare land shows that there is a major decrease in sediment yield (10.89%), about 0.26% decreasing rate for placement efficient of VBS’s per unit hectare. The decreasing rates in total nitrogen and total phosphorus are 6.94% and 5.96%, and the decreasing rates for placement efficient of VBS’s per unit hectare are 0.17% and 0.14%, respectively; also with no significant difference in runoff for the scenario of VBS’s placement. |
本系統中英文摘要資訊取自各篇刊載內容。