| dc.description.abstract | 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. | en_US |