中文摘要：

长江来水来沙变化影响因素众多,除自然因素外,人类活动对河流水沙运动影响越来越显著。作为长江流域的终端,长江口地区既受自然因素影响,同时也显著地受到流域人类活动的影响。采用Mann-Kendall法分析大通站近几十年的泥沙监测资料,结果表明：近几十年来,大通站的年均输沙量一直呈下降趋势,2003年大通站的年均输沙量出现显著下降。长江口来沙量减少主要是由于流域来沙量的显著减少,与水库工程拦沙、长江上游水土保持工程、人工采沙及中游河道泥沙淤积等因素有关。长江口来沙量减少对南支及口外三角洲影响相对明显,均表现为冲刷特征,对此长江口综合治理相关部门应当充分给予重视。

英文摘要：

Factors influencing the runoff and sediment changes of the Yangtze River are numerous, and the human activities are affecting the water and sediment movement more and more obviously besides natural factors. Runoff and sediment changes of the Yangtze estuary are influenced by both natural and human activities. This paper uses the Mann-Kendall method to analyze the monitoring information for the current decades at Datong station. The results show that the annual sediment transportation decreases in recent decades at Datong, especially obviously from 2003. The sediment reduction of the Yangtze estuary is mainly due to the significant reduction of sediment supply in the Yangtze River basin, which is caused by the sediment retention by reservoir engineering, soil and water conservation engineering in the upper Yangtze River, sand mining, and sedimentation at the middle reaches in the Yangtze River, etc. It＇ s obvious that the south branch and outlets delta are scouring recently because of the sediment reduction in the Yangtze estuary. More attention shall be paid to this change.