往复流作用下推移质输沙强度的计算公式  

Formula for predicting bedload sediment transport rate under oscillatory flows

作　　者：李明 俞梅欣[2] 喻国良 LI Ming;YU Meixin;YU Guoliang(Department of Naval Architecture and Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;China Shipbuilding NDRI Engineering Co.,Ltd.,Shanghai 200063,China)

机构地区：[1]上海交通大学船舶与海洋工程系,上海200240 [2]中船第九设计研究院工程有限公司,上海200063

出　　处：《哈尔滨工程大学学报》2019年第2期247-253,共7页Journal of Harbin Engineering University

基　　金：科技部水资源高效利用重点专项(2016YFC0402607)

摘　　要：为了研究往复流的非恒定效应对推移质运动的影响,能够更准确地预测往复流作用下推移质输沙强度的大小,本文通过对泥沙颗粒运动进行受力平衡和能量守恒分析,推导出往复流作用下推移质输沙强度计算公式,同时将Keulegan-Carpenter数引入公式中对相位滞后效应进行修正,最后根据往复流水槽的实验数据拟合得到一个用于计算半周期平均输沙强度的半理论半经验公式,该公式在小KC数情况下对实测值的预测相比于传统的准恒定流模型有明显提高。To examine the influence of unsteady effect of oscillatory flow on bedload sediment transport and accurately predict the bedload sediment transport rate under oscillatory flows,this study presents an analysis of force balancing and energy conservation in sediment particle movement.Calculation formulas for bedload sediment transport rate under oscillatory flows are derived and,in the meantime,Keulegan-Carpenter(KC)number is introduced to correct the phase-lag effect.Finally,experimental data on oscillatory flows are fitted,thereby deriving a semi-theoretical semi-empirical formula used in calculating the half-cycle averaged bedload sediment transport rate.Compared with the existing quasi-steady flow model,the new formula shows an obvious improvement in predicting the measure results,especially when the KC number is small.

关 键 词：推移质运动 往复流 U型水槽实验 相位滞后 KC数修正 半理论半经验公式 

分 类 号：TV142[水利工程—水力学及河流动力学]