準確的近岸水動力及地形觀測一直是海岸工程的重要研究議題，也是各種海岸管理的重要依據。以光學影像方式進行海岸觀測與分析已行之有年，近二十五年來奧勒岡州立大學海岸影像實驗室研發一套Argus海岸遙測系統，並廣泛地應用在各種近岸的問題解析。Argus為一低成本的長期影像觀測系統，可提供即時影像、平均影像、變異影像與像素灰階度時序列等影像資訊。本研究在西子灣鄰近區域架設三個觀測站進行海岸影像觀測與分析。第一個測站以單一方向的攝影機觀測小尺度區域的海岸影像，並應用廣義梯度向量流場主動輪廓模式的邊界偵測演算法，以追蹤短時間內波浪之連續淺化情形。第二個測站以單一可控制轉向的攝影機，取代Argus海岸遙測系統中多攝影機的架設方式，觀測大尺度的海岸影像，並完成全景影像與拼嵌影像。累積的海岸平均影像資料庫則用於分析短期及長期間前灘及潮間帶的海岸地形變化，如觀測西子灣在實施人工岬灣及養灘工法後附近海岸地形之變遷。第三個測站以單一方向的高解析度攝影機觀測小尺度區域的海岸影像，配合像素陣列分析了解波浪淺化時之傳遞特性以及近岸流場循環特性。本研究中並修正Argus 觀測系統中錯誤的直接線性轉換公式。

Adequate measurements of the near-shore hydrodynamics and morphodynamics have been important research issues in the coastal engineering, they are also vital for various coastal management problems. Over the past 25 years, optical remote sensing has been developed into a very useful tool for sampling the near-shore environment, principally through the use of Argus Stations developed by the Coastal Image Lab of Oregon State University. The Argus is a low-cost and long-term measurement system which provides snapshots, average images, variance images and time series images from pixel instruments. In this study we establish three near-shore observation systems to acquire and analyze the near-shore image data of Hsi-tzu-wan bay. The first observation system employs a fixed orientation camera to acquire images of a small-scale coastal area, a generalized gradient vector flow active contour model is then used to track the shoaling process of near-shore waves. The second observation system employs a pan/tilt/zoom camera, instead of the multi-camera Argus system, to record images of a large-scale coastal area along the Hsi-tzu-wan bay. All images from this pan/tilt/zoom camera are then integrated for panoramic photography and mosaic process of coast view. The database of average coastal images obtained is used to analyze inter-tidal bathymetry and foreshore topography in short-term and long-term variations, such as the topographic change of Hsi-tzu-wan beach after the construction of two headlands with beach nourishment. The third observation system employs a high-resolution fixed orientation camera to acquire images of a small-scale coastal area, and pixel time series analysis is used to analyze the near-shore hydrodynamics. The erroneous Direct Linear Transformation algorithm of Argus system are also corrected in this study.

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