石門水庫蓄水範圍保護帶劃設之研究

本文探討水庫蓄水範圍保護帶之劃設，考量植生保護帶設置後之泥砂懸浮固體削減率及設置益本比兩項指標，以研擬合理之保護帶寬度。考慮石門水庫蓄水周邊之土地條件與使用現況，利用地理資訊系統輔助分析土地利用形態，以推估水庫周邊現況之非點源污染潛量，同時評估保護帶設置後之污染削減率及益本比，以訂定出合理之保護帶寬度。研究顯示石門水庫周邊區塊之平均坡度條件爲54.05%時，植生保護帶對懸浮固體物的削減效果一般均可達到60%以上，考量經濟效益的益本比與污染削減率兩者兼具之合理性，可視30公尺寬度爲較佳方案：但若不考慮益本比，則可視水庫周邊土地之土地權屬、水質、地質、植被及坡度等因子，適度擴增保護帶寬度，以增加污染削減率與水土保育功能。

關鍵字

水庫；泥砂懸浮固體；保護帶；地理資訊系統

並列摘要

This study undertakes to design a baiter zone far the purpose of protecting water quality of reservoirs. By using two basic prineiples reduction rate of suspended sediment from the vegetation area of the buffer zone, and cost-benefit ratio of the construction, the study aims to arrive at a reasonable width for the buffer zone. Our research approach taken at the Shimen Reservoir included soil characterization and bad-use classification identification that is aided by GIS to develop potential location and extent of non-point sources pollution around the reservoir, and assessing the rate of contamination reduction as a result of buffer tone and its cost-benefit ratio. At the same time, the width of the baiter zone is determined with the analysis performed. The study shows the average condition for the Shimen Reservoir is: when the surface slope of the hill is around 54.05%, the buffer zone could have over 60% reduction effect in suspended sediment. Taking into consideration both the economic factor of cost efficiency and sediment reduction, the best design for the buffer zone is that of 30 meter in width. If, however, we choose to disregard the cost and benefit factor, the width of the buffer zone can be increased where it is reasonable, depending on the factors such as property rights, water quality, geology, vegetation cover, and surface gradient to enhance its effect in contamination reduction and water conservancy.

並列關鍵字

Reservoir ； suspended solid ； buffer zone ； geographic information system

國際替代計量

石門水庫蓄水範圍保護帶劃設之研究

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