雷射定位質點影像流速與水位整合量測系統

本研究提出雷射定位質點影像流速與水位整合量測系統，其係平行投射四點矩形排列之雷射光於水面上，提供PIV流速影像辨識之參考尺度，同時並偏角投射第五點雷射光於水面上，以利用雷射點位移來偵測水位變化，因此，本系統能達到流速、水位之整合量測。本研究目前已利用宜蘭牛鬥橋建置的雷射定位攝影量測系統，量測獲得牛鬥橋常流量以及麥德姆颱風高流量之水位與流速變化，經與其他量測值比較分析，顯示本系統之雷射定位與PIV演算法具有良好的精確度，能有效量測到洪水期間高、低流速與水位的流況，具有實務應用的可行性。

關鍵字

雷射；質點影像流速；水位；量測；影像辨識

並列摘要

In the present study, an integrated system of laser-positioning PIV and water-level measurement is proposed for monitoring surface velocity and water level in the river. Based on the characteristics of laser-positioning technique, it is designed that four laser points of the integrated system are projected in parallel onto the water surface plane such that the projected lights rectangular-arrayed in the plane can be utilized as spatial referenced coordinates to provide the scale of image ortho-rectification in the PIV measurement. In addition, the 5th laser point of the integrated system is projected with a declined angle onto the water surface plane. Through the laser point displacement, it can detect the variation of water level. Therefore, the system can achieve the flow velocity and the water level of the integrated measurement. In this study, the laser-positioning photogrammetry integrated system has been built at the Niudou Bridge, located in Yilan area, to measure the variation of water level and velocity in the regular flow season and flood period during the typhoon Matmo event. Those measurements in the field are employed to validate the proposed system. By comparing with the other reliable measured data, it is shown that the laser positioning and PIV algorithm of the integrated system performing good accuracy. Therefore, it can be concluded that the system can effectively measure the various conditions of high and low flows during floods, and has a great potential of practical application in the field.

並列關鍵字

laser ； particle image velocimetry (PIV) ； water level ； measurement ； image recognition

國際替代計量

雷射定位質點影像流速與水位整合量測系統

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