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对１９９８年黄河河口段挖河固堤启动工程基本情况，１９９８年汛期来水来沙条件及挖沙河段冲淤演变情况进行了分析。在１９９８年水沙条件下，挖沙河段初期回淤较快，当回淤量占挖沙量的７７％时，挖沙河段达到总体输沙平衡。通过实测资料分析、物理模型试验与数学模型计算结果对比可以看出，挖沙以后挖沙河段回淤量较不挖沙时增加，但扣除挖沙量后，挖沙河段较不挖沙时少淤，挖沙减淤比为１∶０５左右
The basic situation of dredging and embankment embankment construction at the estuary of the Yellow River in 1998, the incoming water and sediment conditions in flood season in 1998 and the evolution of scouring and silting in the dredging sand section are analyzed. Under the conditions of water and sediment in 1998, siltation in the early stage of dredging is quicker. When silt deposition accounts for 77% of the dredging amount, the dredging reaches the overall sediment balance. Through the analysis of the measured data and comparison between the physical model test and the calculation results of the mathematical model, it can be seen that the dredging amount of dredging Shahe after dredging is not increased when dredging is not carried out. However, Silt, dredging silt reduction ratio of about 1:0 5