视觉测流技术在中小河流洪水流量监测中的应用研究

Application of Visual Flow Measurement Technology in Flood Discharge Monitoring of Small and Medium Rivers

基于粒子图像测速技术(PIV)和粒子追踪测速技术(PTV)的河流水面成像测速的视觉测流技术,具有瞬时获取全场流速、湍流特征、流动模式等特点。为分析视觉测流技术在中小河流洪水监测中的可行性和适用性,在西溪河宁桥水文站断面搭建了一套视频测流系统,并开展流量比测试验。结果表明,视觉测流系统能够在短时间内完成一次测量,通过后台处理软件迅速计算出断面流量。比测试验期间流量相关关系较好,校正后与目标流量相对误差较小,能够安全、高效实现非接触自动流量测验,适合高水条件下中小河流洪水监测。

Visual flow measurement technology based on Particle Image Velocimetry(PIV)and Particle Tracking Velocimetry(PTV)enables the instantaneous acquisition of full-field flow velocities,turbulence characteristics,and flow patterns.To assess the feasibility and applicability of visual flow measurement technology to flood monitoring of small and medium rivers,a visual flow measurement system was built and tested for the Ningqiao hydrographic station section of Xixi River.Findings indicate that the visual flow measurement system is capable of rapidly measuring and accurately calculating sectional flow via background software.A good flow correlation was observed during the test period,and the relative error with respect to target flow was minimized through correction.The proposed system enables non-contact,automatic flow testing that is both safe and eficient,and meanwhile suits the monitoring of floods in small and medium-sized rivers particularly under high water conditions.