氣候變遷為現今人類面臨如何與環境永續共存之重要課題，臺灣四面環海，其海岸帶之民生、經濟、生態環境深受海洋變化而影響，海岸災害隨全球氣候變遷引致之海水位上升及極端天氣事件頻發及強度增強逐漸呈現大規模化、高頻率化、多樣化與複雜化的趨勢。本計畫研究目的為了解氣候變遷極端事件對雲嘉沿海離岸沙洲變遷之影響與衝擊，為達成此目的，本研究策略為透過對三條崙沙洲進行先進的監測調查與數值模擬，釐清氣候變遷、極端事件、人為開發等在海岸變遷的扮演角色，再據此掌握該沙洲過去變遷趨勢與現況，進一步預測未來變遷速度與影響。本研究預期達成之科學研究成果包含：一、了解影響三條崙沙洲變遷之水動力和泥沙輸送的關鍵因子；二、於極端事件-颱風的影響下，對三條崙沙洲變遷之影響程度、時間、範圍；三、濁水溪口附近海域之牡蠣礁對沿海流場特徵和海床形態變化之影響。本研究第一年先執行三條崙沙洲現場觀測，觀測儀器包括使用本團隊研製之移動式微波雷達，應用微波雷達於海岸線及潮間帶地形測量之技術；執行本團隊研發微型化漂流浮球之佈放實驗，以研究三條崙沙洲之潟湖內混和與擴散以及水體交換率；建置自動化多參數水質儀並進行水體監測，並搭配NearCoM-TVD數值模式與DHI MIKE數值模式了解三條崙沙洲之漂砂運移過程。本計畫研究之三條崙沙洲變遷結果可提供總計畫作為沿岸養殖漁業受到氣候變遷效應的衝擊與脆弱度分析之重要資訊，也可提供其他子計畫對於漁業產業、人文社會之衝擊評估作為參考。 ;The aim of this project is to understand the impact of climate change extreme events on the change of offshore sandbars along the coastal zone of Yun-lin and Chia-yi county. In this research, we use on-site surveys and numerical simulations of change of San-tiau-luen sandbar. In the first year of this study, we use on-site observations of the San-tiau-luen sandbar. The observation instruments include the microwave radars developed by our group and the application of microwave radars to shoreline and intertidal topographic measurement techniques; using miniature buoys to study the mixing and diffusion and Water Exchange Capacity in the lagoon of the San-tiau-luen Sandbar; we will also build an multiparameter sonde system to survey the water quality. And we will use the NearCoM-TVD numerical model and DHI MIKE numerical model to study the drift sand moving process.The research results expected in this study include: 1. Understanding of the key factors affect the hydrodynamics and sediment transport of the San-tiau-luen Sandbar; 2. Understanding the strength, range and time of the impact on the changes of the San-tiau-luen Sandbar under typhoons; 3. Understanding the effect of oyster reefs to the current field and the change of the topography.The results of the change of San-tiau-luen Sandbar in this project can provide the results for vulnerability analysis of coastal aquaculture fisheries affected by climate chang, and could also provide other projects for the impact assessment of the fishery industry and human society.
