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由于气候变化和人类活动的影响，长江中下游干流的水沙过程发生显著变化。含沙量是反映水沙关系的重要指标，为了明晰新形势下长江中下游含沙量变化的特征，基于实测数据分析了含沙量的时空变化过程。受上游来沙减少影响和床沙粗化向下游传递，荆江河段含沙量极低，河床的泥沙补给作用减弱，洞庭湖和鄱阳湖等湖泊及支流的泥沙输入对中下游干流的贡献增加，对增大长江下游及河口的输沙量起到关键作用。
Abstract：With the influence of climate change and human activities, the flow and sediment processes in the middle and lower reaches of the Yangtze River have significantly changed. Sediment concentration is an important index reflecting the flow-sediment relationship. Based on the measured data in the middle and lower reaches of the Yangtze River, the temporal and spatial variation processes of sediment concentration was analyzed to clarify their variation characteristics under the new situation Due to the decrease of sediment load from upstream and the coarsening of river bed to downstream, the sediment concentration in the Jingjiang reach is extremely low, sediment replenishment from river bed is weakened. Consequently, the contribution of sediment transported from Dongting Lake, Poyang Lake and other main tributaries to the main stream increases, which has played a key role in maintaining the sediment load in the lower reach and estuary of the Yangtze River.
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基本信息:
DOI：10.16239/j.cnki.0468-155x.2025.01.004
中图分类号:P333
引用信息:
[1]叶新,郭磊城,陈嘉民等.长江中下游干流含沙量变化特征[J].泥沙研究,2025,50(01):23-30.DOI:10.16239/j.cnki.0468-155x.2025.01.004.
基金信息:
国家自然科学基金长江水科学研究联合基金项目(U2040216); 上海市科委重点基金项目(22dz1202701)