基于图像识别的非恒定流卵砾石输移试验研究

Study on incipient motion of uniform gravel by unsteady flow

采用自主研发的水位、泥沙运动同步观测系统,分析相同幅度、不同周期非恒定流条件下卵砾石起动试验研究,其中水位与泥沙运动观测系统主要由相机、超声水位计组成。提出了卵石运动图像的分析方法,能够有效识别经过断面的卵石运动。初步对非恒定流条件下卵砾石输移进行研究,试验结果表明,非恒定流条件下,上升段输沙强度大于下降段输沙强度,随着周期的增加,上涨段与下降段的输沙强度差逐渐减小。

The analysis method of cobble and gravel motion image is proposed in this paper,which can identify the cobble and gravel movement through cross section under unsteady flow conditions. Results showed that the rising period of sediment transport intensity is greater than the decline period of sediment transport intensity under the condition of unsteady flow. With the increase of cycle,the difference between rising period and decline period is diminishing.