運用地理資訊系統於翡翠水庫集水區非點源污染潛勢地區分析

Abstract

本研究目的為尋找翡翠水庫集水區內，可能造成非點源污染之關鍵 區域，引用Sivertun 提出之「土壤沖蝕污染關鍵區潛勢指標模式，(PI)」。藉由土壤因子(K)、土地利用因子(U) 、坡度因子(S)及水道因子(W)配合地理資訊系統(GIS)技術，尋得土壤沖蝕與污染之風險地區。結果顯示，翡翠水庫集水區有3.09%面積為較高風險區域，多集中在北勢溪中段土地利用型態密集複雜處，此模式之優點在能快速評估出非點源污染關鍵區。

The object of this research is using the potential index, a simplifical USLE model, to analysis and find out the critical area of non-point pollution source in the Feitsui reservoir watershed. The potential index, including the soil factor (K), the landuse factor (U), the slope factor (S) and the watercourse factor (W) four factors which can be used as the indicator of pollution potential and with the aid of GIS the critical locations can be identified. The result shows that there are 3.09% area of the Feitsui reservoir watershed which classified as high-risk area. The high-risk area distributed in the middle of Bei-Shi river where landuse type are more complicated. The PI model has the advantage of screening out the critical area of non-point source pollution rapidly.