在全球氣候變遷的影響下，極端降雨的事件發生的頻率變得更頻繁，每當強降雨發生時，因都市不透水面的增加，使都市內之雨水一時無法排出，導致低窪地區較容易淹水，而都市綠地所提供的功能除了可增加土壤保水性能外，亦可減緩都市逕流。現今已開發之綠地有會因劃設位置及整體區位分佈不適宜，使其功能未能有效發揮，若是能將綠地系統與防洪、治水做更進一步的規劃與空間配置，將能減緩因強降雨所造成都市地區之淹水、積水等問題。
近年來地景生態概念與指數已應用於空間規劃中，以空間格局探討生態過程，提供規劃師了解並比較不同土地覆蓋類型之空間配置，並可模擬及預測一項規劃案之執行成效。地景指數可測量地景組成的元素和空間配置，用來描述各式空間格局特性，可提供關於地景功能的資訊。因此，本研究探討台北市綠地之空間分佈與淹水潛勢區位之關係，首先，透過地景指數量測綠地的空間結構，並利用此方法之結果分析現況都市綠地的面積大小、形狀及空間特性與佈局的生態意義，再挑選出具有減少淹水面積之指數。利用挑選出之指數，分析都市計畫劃定之公園綠地的空間分佈，並分析其與淹水面積百分比之相關性。最後，再將台北市淹水潛勢圖與都市綠地之位置做圖層套疊，分析綠地與淹水之關係，並探討都市綠地之適宜性。
Under the influence of global climate change, the frequency of extreme rainfall events has become more intense. When heavy rainfall occurs, it is hard to be discharged immediately due to increases in impermeable urban areas, resulting in flooding in lowlying areas. Urban green spaces have the abilities not only to retain water but also to reduce runoff. However, the distributions and the locations of the developed urban green spaces are partly appropriate, resulting in inefficiency of water retentions. If urban green spaces can be planned and located from the aspect of flood protection and water management, floods due to heavy rainfall will be reduced.
Recently, the concepts of landscape ecology and landscape metrics have been applied to spatial planning to explore ecological processes in a spatial pattern, providing planners to understand and compare the spatial configurations of different land cover types as well as to simulate and predict results of planning cases. Landscape metrics can measure landscape elements and spatial configurations, which are used to describe various spatial pattern features and provide information about features of landscape. Therefore, this study investigates the relationships between the spatial distributions of urban green spaces and the potential location of flooding by using Taipei City as a case study area. First, the spatial structures of urban green spaces aremeasured by Landscape metrics, including the areas, the shapes and the spatial characteristics and the ecological significances. Then, the indices which can reflect degrees of flood reduction are selected to analyze the spatial distributions of urban-planned green spaces and their correlations with the area percentages of flood potential zones. Finally, the relationships between green spaces and flood potential zones are analyzed by overmapping the flood potential map and the green space map. The suitability of green spaces in Taipei City is also discussed.
