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研究生: 林冠州
Lin, Guan-Zhou
論文名稱: 應用非點源汙染模式SWAT模擬翡翠水庫上游集水區流量及氮素之輸出與移動
Application of nonpoint source pollution model SWAT to evaluate streamflow and the flow pathways of nitrogenous fertilizer in the upstream watershed of Feitsui Reservoir.
指導教授: 李宗祐
Lee, Tsung-Yu
郭乃文
Guo, Nae-Wen
學位類別: 碩士
Master
系所名稱: 地理學系
Department of Geography
論文出版年: 2017
畢業學年度: 105
語文別: 中文
論文頁數: 173
中文關鍵詞: 非點源汙染SWAT模式硝酸鹽氮模擬氮肥水流移動路徑氮素移動路徑
英文關鍵詞: non-point pollution, SWAT model, nitrate modelling, nitrogen fertilizer, flow pathway, nitrogen pathway
DOI URL: https://doi.org/10.6345/NTNU202202529
論文種類: 學術論文
相關次數: 點閱:161下載:47
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  • 人為活動發展產生的非點源汙染難以了解其移動途徑而使得控制不易,其中農業活動所使用的肥料為非點源汙染的主要來源之一,翡翠上游集水區茶葉種植對水質的影響,一直是關注的焦點。本研究透過SWAT模式模擬翡翠水庫上游集水區2012年至2014年間日流量與日硝酸鹽氮之輸出量,並藉由SWAT-CUP檢定該集水區肥料施放量,進而從模式模擬之結果了解氮肥於農地移動路徑與分布,藉以評估肥料被茶樹利用之情形。SWAT模式於模擬日流量與河川日硝酸鹽氮輸出量皆達到良好的水準以上(Nash-Sutcliffe model efficiency coefficient>0.65),各集水區肥料檢定成果落於200~420kg/ha,符合農糧署建議之施放量。
    本研究先探討水質採樣頻率對於硝酸鹽氮觀測值推估之影響,成果顯示九十天採樣頻率所造成的年推估誤差最大(各集水區誤差最大可達1692%);並從氮素移動路徑分析,得出大部分集水區茶樹吸收量皆少於其輸入總量(含乾濕沉降與肥料)之60%,顯示有40%以上輸入的氮素儲存在土壤、入滲至地下水或進入河川;翡翠水庫上游集水區茶園氮素單位面積輸出量高於森林約3~7倍,茶園地表逕流氮素輸出量為森林的5~25倍,茶園側向流氮素輸出量為森林的1~8倍,茶園土壤氮素輸入量為森林的2~8倍,茶園地下水輸出量為森林2~6倍,顯示人為農地施肥對於河川與土壤將有所影響。肥料減半情境之模擬結果顯示,在收穫減少約10~20% (約60~100kg/ha之產量)之情況下,各氮素移動路徑可削減約50%之輸出量。本研究驗證了SWAT模式在臺灣集水區的適用性,未來配合經濟模式的評估,將可綜觀模擬農業策略對於集水區環境與農業產值之影響,做為集水區經營規劃的參考依據。

    Human activity-induced nonpoint source pollution cannot be well controlled owing to its unpredictable pathways. Fertilizer is one of the most important nonpoint pollution sources in the cultivated watersheds. Tea cultivation located in the upstream of the reservoir would hence pollute the water of the reservoir. This study used SWAT to simulate daily runoff and nitrate flux in the upstream watersheds of the Feitsui Reservoir in 2012-2014. Besides, SWAT-CUP was used to calibrate fertilizer amount. Through the investigation of modeling results, we wanted to identify the flow pathways of nitrogenous fertilizer and evaluate the efficiency of fertilization by comparing the amount of fertilizer with the amount of nitrogen that uptake by tee trees. SWAT can simulate the observed daily runoff and nitrate flux well (Nash-Sutcliffe model efficiency coefficient >0.65). The result showed that during the period of 2012 to 2014 the amount of applied fertilizer was between 200kg-N/ha to 420kg-N/ha in each watershed.
    This study investigate the water quality sampling frequency how to influence the nitrate flux estimation of daily simulated .The result show the ninety days frequency will cause the most deviation of the yearly nitrate flux estimation ( most deviation is 1682%) .We analyze the nitrate pathways demonstrate the uptake of tea tree was less than 60% of the total nitrogen input (including dry/wet deposition and fertilizer), indicating more than 40% of the nitrogenous fertilizer was either flushed off to the stream or stored in the watershed, e.g. in soil or to groundwater. The agriculture land exported nitrogen was 3-7 times of the forest. The tea farm surfaceflow exported nitrogen was 5~25 times of the forest and the lateral flow exported nitrogen was one 1~8 times of the forest. The tea farm of nitrogen input to soil was 2~8 times of forest and the tea farm groundwater exported nitrogen was 2~6 times of forest which demonstrate the human activity will influence the soil and river
    We set the situation of fertilizer application half to simulate the nitrogen pathways and tea harvest. The result demonstrated that the harvest will loss about 10~20% (about 60~100kg/ha), but it could loss about 50% nitrogen of each pathways. We expect to coordinate the nitrogen stored in soil and the tea trees mature to make fertilizer half strategy and analyze the influence of economy and watershed environment. We hope that this strategy can promote to the other watershed of eutrophication in the future.

    第一章 前言 1 1.1 研究動機 1 1.2 研究目的 2 第二章 文獻回顧 3 2.1 非點源汙染模式 3 2.2 人為活動對水質的影響 6 2.2.1 大氣沉降 6 2.2.2 農業活動 7 2.3 人為活動對水質的影響 8 第三章 研究區域與研究方法 11 3.1 研究區域概況 22 3.2 研究方法 17 3.2.1 研究資料 17 3.2.2 河川硝酸鹽氮之濃度與通量 17 3.2.3 SWAT模式簡介 22 3.2.4 SWAT-CUP簡介 33 3.2.5檢定驗證指標簡介 34 第四章 流量與硝酸鹽氮模擬成果 37 4.1 日流量模擬 37 4.1.1 思源橋集水區 37 4.1.2 坪林拱橋集水區 40 4.1.3 大林橋集水區 43 4.1.4 金瓜寮溪橋集水區 46 4.1.5流量參數比較與探討 49 4.2 硝酸鹽氮日輸出量模擬 50 4.2.1 思源橋集水區 50 4.2.2 坪林拱橋集水區 55 4.2.3 大林橋集水區 58 4.2.4 金瓜寮溪橋集水區 62 4.3作物收穫量模擬成果 66 第五章 模擬成果分析與討論 69 5.1 採樣間隔與觀測值推估之不確定性 69 5.2 水流移動途徑分析 72 5.2.1 思源橋集水區 72 5.2.2 坪林拱橋集水區 85 5.2.3 大林橋集水區 97 5.2.4 金瓜寮溪橋集水區 109 5.2.5各集水區水流移動路徑分析比較 121 5.3 氮素移動途徑分析 123 5.3.1思源橋集水區氮素的移動路徑 123 5.3.2坪林拱橋集水區氮素的移動路徑 127 5.3.3大林橋集水區氮素的移動路徑 131 5.3.4金瓜寮溪橋集水區氮素的移動路徑 135 5.3.5氮素移動路徑比較分析 139 5.4 人為活動與自然環境氮素輸出量比較 141 5.4.1各集水區土地利用氮素輸出量比較 141 5.4.2思源橋集水區農地與森林氮素路徑輸出量比較 146 5.4.3坪林拱橋集水區農地與森林氮素路徑輸出量比較 148 5.4.4大林橋集水區農地與森林氮素路徑輸出量比較 151 5.4.5金瓜寮溪橋集水區農地與森林氮素路徑輸出量比較 154 5.4.6各集水區農地與森林氮素路徑輸出之比較與分析 156 5.5 肥料施放削減成效評估以思源橋和坪林拱橋為例 157 5.5.1 思源橋集水區 157 5.5.2 坪林拱橋集水區 160 第六章 結論與建議 163 參考文獻 166

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