一种随机性的推移质输沙率公式研究  

A Stochastic Formulation for Bed-load Transport

作　　者：苏瑞林 王秋生[1] SU Rui-lin;WANG Qiu-sheng(College of Architecture and Civil Engineering,Beijing University of.Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《水电能源科学》2018年第12期75-78,128,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51679003;50779073)

摘　　要：基于颗粒受力平衡推导了推移质起动条件,根据近壁水流应力分布特性,提出了水流有效切应力区的概念,结合推移质在平衡输沙情况下的运动规律,得到了理论更为完善的随机性推移质输沙率公式,并对公式进行了起动条件敏感性分析,发现低水流强度下的输沙率计算对起动条件较为敏感,因而合适的推移质起动强度是控制输沙率计算精度的关键。利用经典推移质输沙率实测数据及野外实测资料对公式进行了检验,结果表明,该公式与实测数据吻合良好,验证了公式的合理性和适用性。Based on the force balance of particles subjected to the flow,the bed-load incipient motion threshold was obtained.According to the characteristics of near-bed shear stress distribution,the concept of effective shear stress zone was proposed.Combined with the motion pattern in the condition of balanced sediment transport,a stochastic bed-load transport rate formula was derived.The sensitivity analysis of the incipient motion threshold to the formula was carried out.It shows that the calculation of the sediment transport rate under low flow intensity is more sensitive to the threshold. Thus,choosing the proper threshold of bed-load is the key to control the precision of sediment transport rate.The proposed formula was compared with the laboratory experiments measured data and the field measured data.The result shows that the proposed formula is in good agreement with the measured data,and the rationality and applicability of the formula are verified.

关 键 词：推移质 起动条件 输沙率 近壁水流应力分布 

分 类 号：TV142[水利工程—水力学及河流动力学]