中文摘要：

着重分析了1976年清水沟流路以来黄河河口尾闾河道冲淤变化特点，结果表明：①1976—2005年间，河口河段经历了强烈淤积-强烈冲刷-持续淤积-持续冲刷等冲淤变化过程；其冲淤变化与水沙条件、流路改道、河口的淤积延伸及河床边界等条件有关；②利津～7断面河段冲淤变化与利津径流量及来沙系数存在一定关系，与大于2000m^3／s的水量关系密切；③7断面以下河段冲淤变化与利津水沙通量，河道边界条件及流路延伸等因素有关。

英文摘要：

The characteristic of erosion-deposition variation of the tail reach in the Yellow River Estuary have been studied since the tail reach changed to Qingshuigou flow path in the period of 1976-2005. The results show that：① During 1976 - 2005, the estuary reaches experienced the process of strong deposition, intense erosion, continuous deposition, and continuous erosion, etc. The erosion-deposition is related to the incoming water and sediment condition, the shifting of the flow path, the deposition extending of the estuary reach, the riverbed boundary condition,and so on. ② The erosion-deposition of the Lijin section-CS7 reach is related to the runoff and the empirical coefficient of the runoff and sediment load at Lijin station, especially the discharge over 2 000m^3/s. ③The erosion-deposition below CS7 is correlated with the water and sediment flux, the riverbed boundary condition, the reach extension and so on.