基于水流功率的推移质输沙率推求方法探讨

Calculation method of bed load transport rate based on stream power

基于水流功率的概念,从推移质泥沙运动受力平衡的原理出发,建立了推移质输沙率与水流功率的相关关系。以长江寸滩水文站实测推移质资料为例,研究了推移质输沙率与水流功率相关法的整编效果。与传统过程线法及水力因素法的比较结果表明,基于该方法建立的推移质输沙率与水流功率之间具有良好的关系,计算精度满足有关规范要求,适应性良好,且该方法可使相关关系的指数大幅降低,减少了定线的随意性。

Based on the concept of stream power and the force balance principle of the bed load sediment movement, the corre- lation relationship between bed load transport rate and stream power is established. Taking the measured bed load at Cuntan Sta- tion on the Changjiang River as a case, the calculation method for the bed toad data based on stream power was discussed and the calculation results were compared with hydrograph and hydraulic factors methods. The analysis result shows that the bed load transport rate has a good relation with stream power, and the calculation accuracy meets the requirement of correlative codes with good adaptability, in addition, the method can dramatically reduce power index of the correlated relation, therefore avoid arbitrar- iness of the determination of relationship line.