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小浪底水库运行以来,黄河口来水来沙减少,与1976-1996年平均年水量261亿m~3/a、年沙量6.5亿t/a、平均含沙量25kg/m~3相比,2002年调水调沙以来,黄河口来水量减少27%、含沙量减少68%,致使河口感潮段从1976-1996年的淤积,变化为调水调沙以来的冲刷,冲刷速率为34m~3/a·m。河口延伸速率从1976-1996年的1.4km/a降到小浪底水库运行以后的0.3km/a,但远离行河口门的海岸蚀退。建议减少进入黄河口的沙量,或者来沙量较大时,把泥沙分散到三角洲整个蚀退海岸和洲面以抬高洲面高程,可以达到降低行河河口延伸速率、降低防潮堤前海岸冲刷速率、改良盐碱地、改善三角洲海域生态等目的。
Since the operation of Xiaolangdi Reservoir, the inflow and discharge of water from the Yellow River Estuary has decreased. Compared with the average annual water volume of 1976 to 1996 of 26.1 billion m 3 / a, the annual sediment volume of 650 million t / a and the average sediment concentration of 25 kg / m 3, Since the water and sediment adjustment in 2002, the water quantity in the Yellow River estuary has been reduced by 27% and the sediment concentration reduced by 68%. As a result, the estuarine swamp erosion changed from 1976 to 1996 to erosion after water and sediment adjustment, with the erosion rate of 34m ~ 3 / a · m. The extension of the estuary decreased from 1.4km / a in 1976-1996 to 0.3km / a after the operation of Xiaolangdi Reservoir, but the coast far from the mouth of the estuary eroded. It is proposed to reduce the amount of sediment entering the Yellow River Estuary or to disperse sediment to the entire eroded coast and continent in the Delta to raise the surface elevation of the Yellow River estuary so as to reduce the extension rate of the estuary and the lower coastline Erosion rate, improve saline land, improve the ecology of deltaic sea and so on.