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中文摘要：
以长江宜昌水文观测站实测资料为基础，基于长江上游河道特点，用回归分析的方法研究了宜昌站流量、含沙量与悬移质泥沙粒度的复杂关系。通过对流量、含沙量多年年内变化的正相关特性的分析，建立了流量与含沙量之间相应的回归模型；通过对流量与悬移质粒度复杂关系的研究，揭示了二者明显的双值关系以及水流挟沙力的控制性影响。对水文数据年际变化的研究表明由于短时间尺度内长江上游流量没有阶段性变化，流量与含沙量之间相关性不是很好，丰水年不一定是丰沙年；悬移质粒度与流量变化基本上不存在周期性变化。
英文摘要：
Based on the data from Yichang Hydrological Station of the Yangtze River,and the characteristics of upriver channel, the complicated relationship of water discharge, sediment concentration and suspended sediment granularity at Yichang Hydrological Station by regression analysis is carried out. After analyzing the positive correlation of the mean multi-year variations of water discharge and sediment concentration,a corresponding regression model between water discharge and sediment concentration is constructed; by studying the complicated relationship between water discharge and suspended sediment size, it is found that there existed obvious double-value relationship between the two parameters and the dominative influence of the hydro-dynamics. The study of the annual variety of hydrological data indicates that the relationship between water discharge and sediment concentration is not satisfying, as there is no phase change of the upriver water discharge in small time scale; flood year is not always the high-sediment year; water discharge and suspended sediment size presents no periodicity.
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