摘要
沙粒阻力的计算是泥沙运动力学的重要问题,以往的研究大多是将沙粒阻力与床沙特征粒径联系在一起。泥沙在起动时其阻力即为沙粒阻力,因而可以利用泥沙的起动阻力来研究沙粒阻力的计算问题,这也是一种较为直接的方法。利用泥沙起动的Shields曲线与明渠阻力特性之间的相似性,结合实测泥沙起动资料给出了沙粒阻力的计算公式。该公式表示的沙粒阻力系数仅是能坡的函数,从而避免了采用相对水深时床沙代表粒径选择的困难。验证结果表明,本文提出的公式在计算精度上要优于现有的其它沙粒阻力的计算公式。
Computation of the sand-grain resistance is one of the most important issues in sediment transport mechanics. In past, study of the sand-grain resistance is used to relate with one of the representative bed-sediment diameter. Because the resistance in sediment incipient motion is the sand-grain resistance, it is proposed that computation of the sand-grain resistance is based on resistance of sediment incipient motion. It is a direct method. By use of the similarity between Shields diagram and open channel resistance, the equation of sand-grain resistance is derived by combining with measured incipient data. This equation shows that sand-grain resistance coefficient is only a function of energy slope and independent of sediment diameter, so the difficulty of selecting representative bed- sediment diameter is avoided. Verification results show that the equation proposed by this paper is super to other sand-grain resistance equations.
出处
《水力发电学报》
EI
CSCD
北大核心
2008年第1期74-78,共5页
Journal of Hydroelectric Engineering
基金
江苏省教育厅自然科学基金指导性计划课题(LK051091)
关键词
河流泥沙工程学
沙粒阻力
理论分析
泥沙起动
能坡
river sedimentation engineering
sand-grain resistance
theoretical analysis
sediment incipient motion
energy slope
