Using experimental data of near-bed suspended sediment concentrations at five typical hydrometric stations of the Three Gorges Reservoir at the early reserving stage, the differences were investigated between the common method and improved method during flood seasons and non-flood seasons. The impact of taking measurements below 0.2 times the water depth on the results was discussed. The results show that the average discharges and velocities at each station calculated by the common method were slightly larger than those calculated by the improved method. Regarding the suspended sediment concentration at each station, the errors in the reservoir and downstream channels in dynamic equilibrium state were small, and the largest errors occurred where the river bed was strongly scoured in the downstream reach below the large dam. There was no significant relationship between water discharge and flow velocity, and the missed measurement phenomenon also occurred. The sediment discharge error was affected by the suspended sediment concentration, implying that errors usually occurred in channels with serious erosion during flood seasons. The correction coefficients (R²) of sediment discharge at each station were given during the experiment, which showed that the sediment discharges at the hydrometric stations where a large amount of sediment transport occurred near the river bottom, needed to be modified. Furthermore, the test methods proposed in this study were applied to calculate the sediment discharges of three rivers, and the results indicate that this method can narrow the gap between bathymetric comparisons and sediment load measurements.

利用三峡水库五个水位站早期典型水位站近床悬浮泥沙浓度的试验数据，研究了汛期和非汛期常用方法与改进方法之间的差异。讨论了在水深0.2倍以下进行测量对结果的影响。结果表明，采用常规方法计算的每个站的平均流量和流速比采用改进方法计算的平均流量和流速稍大。关于各站的悬浮泥沙浓度，在动平衡状态下水库和下游河道的误差较小，最大误差发生在大坝以下的下游河段被强烈冲刷的地方。排水量和流速之间没有显着关系，并且还会出现漏液现象。泥沙排放误差受悬浮泥沙浓度的影响，这意味着在洪水季节，这些误差通常发生在严重侵蚀的河道中。校正系数（在实验过程中，给出了每个站的排沙量R ²），这表明需要对水位站的泥沙排放量进行修正，因为水位站附近河床附近发生了大量的泥沙输送。此外，本研究提出的测试方法被用于计算三条河流的泥沙流量，结果表明该方法可以缩小测深比较与泥沙负荷测量之间的差距。