【摘要】 流速、雷诺数、充满度等单因素指标虽然与雨水管渠的冲刷和淤积量有一定的关联，但是通过单因素指标不足以全面地判断雨水管道的冲刷和淤积。在起动流速和止动流速的基础上，提出了冲刷指数的概念。结合连续非恒定流不同工况下冲刷和淤积量模拟，计算了流速、雷诺数、充满度、冲刷指数4个因素与冲刷量的灰色关联度，其关联度大小依次为：冲刷指数>雷诺数>充满度>流速。根据不同工况的恒定流模型实验的结果，其关联度大小依次为：冲刷指数>>流速>雷诺数>充满度。可以认为，在恒定流与非恒定流工况下，冲刷量和冲刷指数有显著的强相关性，冲刷指数能代替具体的冲刷量计算实现对冲刷程度和趋势的合理判断。更多还原

【Abstract】 Although the single-factor indicators such as flow velocity, Reynolds number, and depth ratio are related to the flush and silt volume of the storm conduit, the single-factor indicators are not enough to comprehensively judge the flush and siltation of the storm conduit. In this study, the concept of flush index is proposed on the basis of pick-up velocity and braking velocity. Combined with the flush and silt volume simulation under different working conditions of continuous and non-constant flow, gray relational analysis between flush volume and the four factors, which are flow velocity, Reynolds number, depth ratio and flush index, is made. The correlation degree is as follows: flush index > Reynolds number > depth ratio > flow velocity. According to the results of the constant flow model experiments under different working conditions, the correlation degree is as follows: flush index>> flow velocity> Reynolds number > depth ratio. It can be considered that under the condition of continuous and discontinuous flow, there is a significant strong correlation between the flush volume and the flush index, and the flush index can replace the specific flush volume calculation to achieve a reasonable judgment of the degree and trend of the flushing.更多还原