基于河流表面时空图像识别的测流方法

Application of Flow Measurement Method Based on Space-Time Image Recognition of River Surface

摘要: 时空图像测速方法(STIV)是一种以河流表面图像为分析对象、通过检测合成时空图像的纹理主方向获取一维时均流速的测量方法。由于具有空间分辨率高、实时性强、安全简便等优点，STIV方法在河流水面流速、断面流量的实时监测中具有特别的应用潜力。鉴于该方法在国内的研究尚处于起步阶段以及现有测流方法的缺点，本研究尝试引进STIV方法以更好地服务于国内水文测验工作。为了验证该方法的可行性并提出研究需求，在崇阳水文站与旋桨式流速仪进行比测试验。结果表明，STIV方法所获取的表面流速的相对误差均控制在16%以内，初步说明了该方法的可行性。

Abstract: Space-time image velocimetry (STIV) is a time-averaged velocity measurement method which takes river surface images as the object of analysis, and detects the texture orientation of a generated space-time image to obtain the one-dimensional flow velocity. STIV method has special application potential in real-time monitoring of river surface velocity and cross-section discharge since it has the advantages of high spatial resolution, strong real-time performance, safety and convenience. Because this method is still in its infancy in China and the shortcomings of the current flow measurement methods, this study attempts to introduce STIV method to better serve the domestic hydrological measurement work. In order to verify the feasibility of the method and propose research needs, a comparative experiment was conducted in the Chongyang hydrological station with the impellor-type current meter. The result shows that the relative error of the flow velocity of STIV method was less than 16%. The feasibility of this method is preliminarily verified in this experiment.