关键词: 视频测流;测流精度;适应性;都江堰;

Abstract: As an emerging automatic flow measurement technology, video-based flow measurement has been gradually popularized in irrigation districts and studies on its accuracy and adaptability in field applications are hot and forward topics.Taking the Dujiangyan irrigation district as an example, based on the flow measurement data of two pilot sections of video flow measurement in the Dujiangyan irrigation district, the flow measurement accuracy under different section shapes and flows was analyzed by using the methods of water level discharge curve inspection, line checking, and video flow measurement comparison.The results show that in the exit section of the Heishi River, which has a complex shape and a large flow rate, the video flow measurement equipment has a significant deviation in flow measurement(up to 36%).However, in the Minjiang Weir section with a regular section shape and small flow rate, the video flow measurement equipment has higher flow measurement accuracy(only about-3%) and better adaptability.

Key words: video-based flow measurement; flow measurement accuracy; adaptability; Dujiangyan water project;