| 摘要: | 本研究主要運用及石門水庫之水質、流量資料進行分析，擬探討出保護帶的適當配置寬度。經由石門水庫現況分析結果顯示，人為開發皆在一固定的較低坡度範圍內進行，且人為開發是沿著水系而開發，故於此範圍內的污染最為嚴重。因此欲消減過度的污染量時，則需沿著水系建置保護帶，予以限制人為開發，以防止水質之惡化。 經由總磷水質污染防制分析結果，可以瞭解秀巒、玉峰、三光及石門子集水區，整體而言應設置40公尺保護帶。而稜角、高義及霞雲子集水區，則應設置50公尺保護帶。經綜合評量發現整個石門水庫集水區擬應設置40-50公尺之保護帶寬度，才足以因應各種因素之需求。當設置50公尺保護帶時，其各類用地為農地75.15公頃（佔總農地9.8％），果園57.84公頃（佔總果園4.2％），建地108.2公頃（佔總建地16.88％）及林地6137.87公頃（佔總林地7.59％）。若能將此各類用地予以消減、管制，將能使水體之總磷水質維持於甲類水體水質標準。 This research applies Geographic Information System (GIS) technique to analysis water quality data and flow data in the Shih-men Reservoir to identify the range of required protection zone. According to Shih-men Reservoir Watershed condition, the human developments are concentrated in the area of the lower gradient along the rivers. The pollutions resulting form this developments are the most serious in the area. Therefore, a protective area along the rivers is demanded to reduce the pollutions. With pollutant prevention of total phosphorous loading, the protection buffer of Hsiu-luan Watershed, Yun-feng Watershed, San-koang Watershed, and Shih-men Watershed should be set at forty meters. However, the protection buffer of Lang-chiad Watershed, Kao-yi Watershed, and Hsia-yun Watershed should be set at fifty meters. As a whole, the protection buffer of Shih-men Reservoir Watershed must be set at the forty to fifty meters. Total area of protection zone consists of agricultural land (75.15 hectare, about 9.8% of total agricultural land), orchards(57.84 hectare, about 4.2% of total orchards), building(108.2 hectare, about 16.88% of total building), and forest lands(6137.87 hectare, about 7.59% of total forest lands). If the lands are reduced and controlled, the total phosphorous loading will maintain water in reservior at A-class quality. |
