【摘要】 通过理论分析与数值计算,研究了冲积河流漫滩水流水力因子的变化特性。结果表明,断面平均流速在漫滩瞬间迅速减小,然后逐渐增大;断面综合动能修正系数、动量修正系数均随水深而缓慢增加,在漫滩瞬间迅速增大,随即快速减小。根据漫滩水流水力因子沿水深的变化特性,提出采用断面横向平均流速为判别因子以定量划分复式断面的滩与槽。此外,文中将其应用于黄河下游漫滩水流的水沙数值模拟,其结果与实际情况符合较好。更多还原

【Abstract】 An investigation on hydraulic characteristics of compound channel is presented in this paper. It shows that the composite velocity exhibits a sharp decrease immediately when water flows over floodplains and increase later, while kinetic energy coefficient and momentum coefficient exhibits a sharp increase immediately when water flows over floodplains and decrease later. Based on the hydraulic characteristics, the quantitative division method for floodplain and main channel of alluvial river is referred. The integrated velocity of compound channel is selected as the discrimination factor. The proposed method is used to divide the floodplain and main channel in flow and sediment mathematical model, and a good result is attained.更多还原