长江嘉陵江汇流特性统计分析

Statistical analysis on flow and sediment characteristics at confluence of Yangtze River and Jialing River

长江、嘉陵江交汇口水流、泥沙运动复杂多变，对该地区航运带来不利影响。根据两江1954～2011年的实测水文资料，统计出嘉陵江支流汇流比和长江干流汇流比，对三峡水库成库前后的全年、消落期、汛期、蓄水期嘉陵江支流汇流比的频率分布，长江干流汇流比在不同流量下的变化，分级流量下的频率分布及各种汇流特征值作出较全面的统计分析。探讨了三峡水库成库前后嘉陵江入汇对重庆河段水流条件的影响。对三峡水库变动回水区末端的航道整治等工程设计和研究提供参考。

The flow and sediment movement at the confluence of Yangtze River and Jialing River was complicated variable, influencing the navigation in this region. According to the measured hydrological data of the two rivers from 1954 to 2011, the statistics for confluence ratio of stem Yangtze River and tributaries of Jialing River was conducted. The frequency density distribu- tions of confluence ratio of Jialing River tributaries in the periods of full year, fluctuating period, flood period and storage period before and after impoundment of Three Gorges Reservoir, and under the different flow magnitudes were analyzed statistically. The impact of inflow from Jialing River on flow condition of Chongqing Reach of Yangtze River was discussed. The results will contribute to the channel navigation maintenance and regulation in the fluctuating back region of Three Gorges Reservoir.