內政部營建署將台灣本島中總共60個區域列為重要濕地，其中包含多種類型的濕地，如內陸型濕地、人工型濕地及海洋或海岸型濕地，濕地可以為社會經濟、自然環境和生態維護帶來可觀的益處。但由於海水面上升和氣候變遷，導致各種極端氣候事件的發生，海洋或海岸型濕地面臨著一定程度的洪災風險，而台灣總共有27個海洋或海岸型濕地，這代表未來可能會有將近二分之一的重要濕地消失，故有必要對這些風險區域進行洪災風險的評估。本研究利用衛星測高所得的海水面異常資料來預測未來(2119年)的海水面上升高度，至於極端海水面的部分則是透過資料集Coastal Dataset for the Evaluation of Climate Impact (CoDEC)獲得，在進行洪災風險評估時，會同時考慮上述兩種情形，並將其二者之總和與各濕地高程進行比較以計算洪水深度及洪水影響區域。結果顯示，無論在基準年(2019年)或是未來，由於台灣西南部本身即屬於低漥地區，該區幾乎所有濕地都具有較高的洪災風險；而台灣東部的濕地則因為本身地勢較高，因而無論在基準年還是未來，洪災風險都相對較低，因此在政府需要對當地採取適當的保護措施時，洪災風險指標可以更顯而易見地呈現出各濕地間的優先保護順序。此外，本研究並未考慮海岸防護措施，某些濕地的洪災風險將會被高估。

A total of 60 areas on the main island of Taiwan is listed as important wetlands by the Construction and Planning Agency, Ministry of the Interior. The list includes many types of wetlands, such as inland wetlands, constructed wetlands, and marine or coastal wetlands. Wetlands can bring considerable benefits in the social economy, natural environment, and ecological maintenance. However, because of sea level rise and the occurrence of various extreme events caused by climate change, marine or coastal wetlands have been exposed to certain flooding risks. There are 27 coastal wetlands in Taiwan, indicating that almost half of the important wetlands may disappear in the future. Therefore, risk assessment is necessary for these risk areas. In this study, sea level anomalies derived from satellite altimetry are used to predict sea level height in 2119. The extreme sea level will be obtained from the Coastal Dataset for the Evaluation of Climate Impact (CoDEC). These two scenarios are taken into consideration individually for conducting flooding risk assessment, and the sum of these two scenarios will be compared to the elevation of each wetland to calculate the flooding depth and flooding area. The result shows that almost every wetland located in the southwestern area of Taiwan has a higher flooding risk because of the lower elevation no matter in the base year (2019) or in the future. In contrast, the wetlands located in the eastern Taiwan have a much lower flooding risk neither in the base year nor in the future. When the government needs to adopt appropriate protection actions for the local area, flood risk indexes can more clearly indicate the priority order of protection among wetlands. In this study, shore protection is not taken into the consideration, so the flooding risk of some wetlands will be overestimated.

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