時(shí)空?qǐng)D像測(cè)速法的敏感性分析及不確定度評(píng)估
[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 鹵1% by reasonable parameter setting, which can meet the precision requirement of hydrological test.
【作者單位】: 河海大學(xué)計(jì)算機(jī)與信息學(xué)院;
【基金】:國(guó)家十二五科技支撐計(jì)劃課題(2015BAB07B01,2015BAB07B03) 中央高;究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金(2017B16914) 江西省水信息協(xié)同感知與智能處理重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金(2016WICSIP006)項(xiàng)目資助
【分類(lèi)號(hào)】:TP391.41
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