中文摘要：

利用冲淤平衡的多分汉河道各分汊含沙量基本相等和冲积分汉河流在分汉口两支汊水流满足动量守恒条件的特点，推导出2种计算分汊河道分流比的简便方法，即等含沙量法和动量平衡法。利用珠江河网共8处的分汉口分流资料进行验证，结果表明，与实际分流比相比，等含沙量法计算的分流比平均相对误差为21％，动量平衡法计算的分流比平均相对误差为6．4％，认为所提出的等含沙量法和动量平衡法适用于分汊河道分流比的估算。

英文摘要：

Based on the suspended sediment concentration in each branch being basically equal in the multi-branch river with steady riverbed and the momentums of the two branches keeping conservation along the right direction of the main river of an alluvial river, two convenient methods to estimate the diversion ratios of bifurcated rivers were derived, i.e., equal suspended sediment concentration method （ESSCM） and momentum conservation method （MCM）. The flow d/version data of eight branch mouths in the Pearl River were validated by means of the above two methods. The results show that the flow diversion ratios calculated by ESSCM and MCM have averaged relative errors of 21% and 6.4% respectively compared with the actual ones. The proposed two methods can be employed to estimate the flow diversion ratios of bifurcated rivers.