1 996年 7月为稳定现有流路和保护三角洲环境 ,通过人工疏浚 ,黄河经汊 1入海。现场实测和卫星遥感研究表明 ,1 996～ 1 998年新入海河口以 1 .75 km/a的速度向海淤进。黄河洪水期入海后形成高含沙量的泥沙流 ,其范围水平方向延伸约 3km宽 ,垂直方向则从海底到海面。该泥沙流中部含沙量最高可达30 kg/m3 ,高于两边 ,且泥沙流含沙量随潮周期变化。实测表明 ,表层沙偏东南运移 ,而中层和底层沙则偏西北运移。这一现象已为 Landsat TM资料所证实。中层和底层沙控制新河口的沉积 ,涨潮时段是形成河口沙坝的重要阶段。 July 1996 In order to stabilize the existing flow path and protect the environment in the delta, the Yellow River passed into the sea through artificial dredging. Field surveys and satellite remote sensing studies show that the new estuary estuaries from 1996 to 1998 dumped into the sea at a velocity of 1.75 km / a. During the flood period of the Yellow River, silt flows with high sediment concentration are formed into the sea, extending horizontally about 3km horizontally and vertically from the sea floor to the sea surface. The sediment flow in the central part of the highest sediment concentration up to 30 kg / m3, higher than the two sides, and sediment flux changes with the tide period. The measured results show that the surface sand migrates to the southeast, whereas the middle and bottom sand migrate northwestward. This phenomenon has been confirmed by Landsat TM data. The middle and bottom sediments control the deposition of the new estuary. The high tide period is an important stage for the formation of estuarine sand dam.