A three-axis accelerometer was combined with large-scale particle image velocimetry (LSPIV) to obtain nonintrusive and safe surface velocity measurements. Dual cameras were established at the Yu-Feng gauging station of Shimen Reservoir to capture near-field and far-field images and analyze the surface velocity of rivers. Surface velocity measurements were obtained with a flow meter, LPSIV with ground control points, and LSPIV with a three-axis accelerometer to compare the measurement accuracy. The results show that the relative root mean square error (RMSE) values for LSPIV with ground control points and with the three-axis accelerometer are 21% and 18%, respectively. The LSPIV technique with the three-axis accelerometer slightly improved the measurement accuracy of the surface velocity. However a three-axis accelerometer can be utilized to replace the traditional ground control points for yielding the camera pose parameters. Furthermore, the effects of the camera pose, three-axis acceleration, interrogation area (IA), and image resolution on surface velocity measurements were explored. The camera pose parameters, namely, roll ($\theta$) and tilt ($\tau$), and three-axis acceleration parameters, including $X_a$ and $Y_a$, influence surface velocity measurements. If the measurement error of the surface velocity is controlled within ±10%, the acceptable variational ranges of $\theta$, $\tau$, $X_a$, and $Y_a$ are 6.2°, 1.3°, 0.11 g, and 0.02 g, respectively. The IA size and image resolution also significantly affect the accuracy of surface velocity measurements. Therefore, the selection of a suitable IA size and image resolution is crucial for accurately measuring surface velocity.

三轴加速度计与大规模粒子图像测速 (LSPIV) 相结合，以获得非侵入性和安全的表面速度测量。石门水库玉峰测站设置双摄像头，采集近场和远场图像，分析河流表面流速。表面速度测量是通过流量计、LPSIV 与地面控制点和 LSPIV 与三轴加速度计获得的，以比较测量精度。结果表明，具有地面控制点和三轴加速度计的 LSPIV 的相对均方根误差 (RMSE) 值分别为 21% 和 18%。带有三轴加速度计的 LSPIV 技术略微提高了表面速度的测量精度。然而，可以使用三轴加速度计来代替传统的地面控制点来产生相机姿态参数。此外，还探讨了相机姿态、三轴加速度、询问区域 (IA) 和图像分辨率对表面速度测量的影响。相机位姿参数，即roll($\theta$) 和倾斜 ($\tau$)，以及三轴加速度参数，包括 $X_{\mathrm{一种}}$ 和 ${是}_{\mathrm{一种}}$，影响表面速度测量。如果表面速度的测量误差控制在±10%以内，则可接受的变化范围为$\theta$, $\tau$, $X_{\mathrm{一种}}$， 和 ${是}_{\mathrm{一种}}$分别为 6.2°、1.3°、0.11 g 和 0.02 g。IA 尺寸和图像分辨率也显着影响表面速度测量的准确性。因此，选择合适的 IA 尺寸和图像分辨率对于准确测量表面速度至关重要。