氣候變遷造成洪災風險不斷增加，各國均意識到結構式減災策略有其極限，開始導入非結構式減災措施，其中土地利用管理被視為核心工具。過去的研究觀察到易淹水地區由於僅依賴結構式防洪措施進行減災，而未注意到都市成長的影響，導致長期災害風險反而增加，並稱之為「堤防效應」。堤防效應發生的關鍵在於缺乏適當的土地利用管理，並且是全球減災管理與規劃者均必須面對的課題。本研究分別由堤防效應的風險分析面向與風險認知面向切入，並結合時間與空間尺度的定量分析探討堤防效應。首先由文獻探討歸納堤防效應下的風險變遷特徵，並據以指認堤防效應之潛在空間範疇，包括剩餘風險變遷分析與淹水災點空間型態變遷分析，最後進一步比較堤防效應潛在地區與其他地區居民之風險認知是否存在差異。研究結果指出東區裕聖里及仁德區三甲里為堤防效應潛在地區，且當地居民具有較低的風險認知。

Flood is the main hazard in Taiwan, and the highly urbanized country still depends heavily on structural measures for risk reduction. However, studies have found that structural measures might increase the flood risk instead of reducing it in the long run. The paradoxical phenomonon is usually addressed as “levee effect’’: lack of land use control and false sense of security provided by hydraulic structures unintentionally encourge development in flood prone area and increase the exposure of flood risk.
Existed literature often address levee effect from the perspective of risk analysis or risk perception. The former concludes that levee effect presents two unique characteristics in risk evolution: 1) flood hazard would ease after the adoption of stuctural measures, 2) the residual flood risk would increase after the adoption of stuctural measures due to urban development. The latter says that levee effect often cause low risk perception because of the eased up hazard and flood experience. However, research from both perspectives is extremely rare in Taiwan, especially lacking quantitative methods for expressing risk evolution.
Therefore, this paper explore levee effect base on boht risk analysis and risk perception. First, flood risk hazard and residual risk change before and after the Flood prone area management plan in 2006 in study area were analyzed, and on the basis of results potential levee effect area were identified. Then, questionnaire survey were conducted in these area to give a understanding about local risk perception. Results shows that Yusheng Village and Sanjia Village are potential levee effect area, and local residents shows lower risk perception.

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