时空图像测速法的敏感性分析及不确定度评估
发布时间：2018-10-26 07:02
【摘要】：时空图像测速方法(STIV)是一种以测速线为分析区域、通过检测合成时空图像的纹理主方向估计一维时均流速测量方法。由于具有空间分辨率高、实时性强的优点,在河流水面流速、流量的实时监测中具有特别的应用潜力。但鉴于现场环境的复杂性和河道水流的变化性,现有研究在敏感性分析及不确定度评估方面尚存在不足,使得方法的实用性受限。对此设计了一种滚动画幅装置来模拟河流水面运动,并在此基础上全面开展了频域STIV方法的定量评估。相比数值模拟和现场比测的方法,该装置能够提供相对真实的测量环境和稳定的运动参数。实验结果表明:测速线长度和示踪条件是影响测量精度的主要敏感因素。通过合理的参数设置可以将方法的不确定度控制在±1%以内,能够满足水文测验的精度要求。
[Abstract]:Spatio-temporal image velocimetry (STIV) is a method to estimate one-dimensional time-averaged velocity by detecting the texture principal direction of synthetic spatio-temporal images using the velocimetry line as the analysis area. Because of the advantages of high spatial resolution and high real-time, it has a special application potential in the real-time monitoring of river surface velocity and discharge. However, due to the complexity of the field environment and the variability of river flow, there are still shortcomings in sensitivity analysis and uncertainty assessment, which limits the practicability of the method. In this paper, a rolling drawing device is designed to simulate the river surface motion, and the quantitative evaluation of frequency domain STIV method is carried out on this basis. Compared with the method of numerical simulation and field comparison, the device can provide relatively real measuring environment and stable motion parameters. The experimental results show that the length of the velocity-line and the tracer condition are the main sensitive factors affecting the measurement accuracy. The uncertainty of the method can be controlled within 卤1% by reasonable parameter setting, which can meet the precision requirement of hydrological test.
【作者单位】： 河海大学计算机与信息学院;
【基金】：国家十二五科技支撑计划课题(2015BAB07B01,2015BAB07B03) 中央高校基本科研业务费专项资金(2017B16914) 江西省水信息协同感知与智能处理重点实验室开放基金(2016WICSIP006)项目资助
【分类号】：TP391.41
本文编号：2294937
[Abstract]:Spatio-temporal image velocimetry (STIV) is a method to estimate one-dimensional time-averaged velocity by detecting the texture principal direction of synthetic spatio-temporal images using the velocimetry line as the analysis area. Because of the advantages of high spatial resolution and high real-time, it has a special application potential in the real-time monitoring of river surface velocity and discharge. However, due to the complexity of the field environment and the variability of river flow, there are still shortcomings in sensitivity analysis and uncertainty assessment, which limits the practicability of the method. In this paper, a rolling drawing device is designed to simulate the river surface motion, and the quantitative evaluation of frequency domain STIV method is carried out on this basis. Compared with the method of numerical simulation and field comparison, the device can provide relatively real measuring environment and stable motion parameters. The experimental results show that the length of the velocity-line and the tracer condition are the main sensitive factors affecting the measurement accuracy. The uncertainty of the method can be controlled within 卤1% by reasonable parameter setting, which can meet the precision requirement of hydrological test.
【作者单位】： 河海大学计算机与信息学院;
【基金】：国家十二五科技支撑计划课题(2015BAB07B01,2015BAB07B03) 中央高校基本科研业务费专项资金(2017B16914) 江西省水信息协同感知与智能处理重点实验室开放基金(2016WICSIP006)项目资助
【分类号】：TP391.41
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