分汊河道分流比估算方法  

Methods for evaluating flow diversion ratio of bifurcated rivers

作　　者：童朝锋[1,2] 严以新[2] 孟艳秋[2] 岳亮亮[2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《水利水电科技进展》2011年第6期7-9,90,共4页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(50709007);水文水资源与水利工程科学国家重点实验室基本科研业务费项目(2010585312);河海大学中央高校基本科研业务费项目(2009B09614);水利部公益性行业科研专项(200701026)

摘　　要：利用冲淤平衡的多分汊河道各分汊含沙量基本相等和冲积分汊河流在分汊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处的分汊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。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.

关 键 词：分汊河道 分流比 等含沙量法 动量平衡法 

分 类 号：P333[天文地球—水文科学]