碎波的發生影響近岸區域內之流場甚巨，在海岸工程、海洋工程及港灣工程等方面皆佔有舉足輕重的角色。然而，由於影響海面上碎波發生之機制過於複雜，一直以來均無合適的理論及工具可以用來得知海面上實際發生碎波之位置，隨著科技的進步，遙測技術的發展漸趨成熟，故將脈衝式都卜勒微波雷達遙測系統應用於近岸區域內海表面發生碎波位置之偵測。

　　本文於台北縣貢寮鄉福隆村雙溪河口附近，使用脈衝式都卜勒微波雷達系統來進行近岸波浪之觀測。由於同一測線上，雷達回波會因雷達照射區域內目標散射物之特性不同而有不同的特徵，利用此特性，分析雷達回波之雷達截面積、都卜勒頻率偏移量、都卜勒頻帶寬度於測線上之不同特徵，便可對近岸波浪進行觀測。文中利用各測線上觀測所得的結果內插出雷達掃描的範圍，並將各測線上出現不同特徵處與現場實地的環境相互對照，最後將各測線上產生最大雷達截面積與最大都卜勒頻率偏移之位置依次連接，便能將近岸海域中波浪發生碎波之位置，直接標定於空間座標系統中。

　　比較本文提出之方法與傳統量測方法可知，利用脈衝式都卜勒微波雷達系統進行近岸波浪之觀測，在時間上，可快速地完成整個偵測的流程；在空間上，相較於傳統單點式觀測，可對距離雷達天線處2公里範圍內，進行整個海面上之觀測作業，且對現場調查人員及儀器設備而言，較無發生意外之顧慮。

　The occurrence of wave breaking on the sea surface effects the flow fields significantly in the nearshore region, and it is believed to play an important role in the coastal engineering, ocean engineering, harbor engineering, and so on. However, the mechanisms for causing the waves to break on the ocean surface are complicated to derive and measure the location where waves break. As the science and technology progress, the techniques of remote sensing get more and more developed. The use of the pulsed Doppler microwave radar system becomes a possible way to detect where waves break on the nearshore sea surface.

　In this paper, we use the pulsed Doppler microwave radar system to observe the nearshore waves nearby the Shuang-Si estuary at Fu-Long village, Gong-Liao township, Taipei county. Along the same measuring line, the character of subjective scatterers under the radar illuminated area changes and the features of radar backscatter will be different. The analysis of radar backscatter involved radar cross section, Doppler frequency shift, and Doppler bandwidth from the sea surface was accomplished. Eventually, the maximum radar cross section and Doppler frequency shift on the same measuring line, and connect the position on every measuring line respectively. The radar system was shown the capability to delineate the location of breaking wave clearly.

　Compared with the traditional measurement, in aspect of time, the application of pulsed Doppler microwave radar system for nearshore wave observation can accomplish a detection case promptly within 20 minutes; furthermore, in aspect of space, it can scan as far as 2 kilometer that is sufficient for most nearshore events to achieve a measurement operation. Significantly, it is safe and secure for investigators and instruments that they can accomplish all detective operation successfully.

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