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黄河口系多沙弱潮河口,感潮段短,其长度一般为15～30公里。潮流界只发生在口门附近,汛期不明显。因此,黄河口的河口段即潮流界以下的河段也短,目前在黄河口测验工作中,习惯于把改道点以下的新河称为河口段。河口段的演变主要受河流动力和海洋动力的相互作用。为了把水沙输送入海,河口段在不断调整其比降与河长,使河道向相对平衡状态发展。 黄河巨量泥沙输入滨海区,使海岸线向外延伸,同时滨海区的等深线亦产生相应的变化。本文从分析实测资料着手,主要探讨黄河河口段比降与河长的调整规律和滨海区15米等深线的变化情况。
Yellow River estuarine more sandy weak tidal estuary, short tide, its length is generally 15 to 30 km. Trend sector only occurs in the vicinity of the mouth, the flood season is not obvious. Therefore, the estuary of the Yellow River estuary that is the trend of the river below the trend is also short, at present in the Yellow River Estuary test work, the new river below the diverted point is called the estuary. The evolution of estuary is mainly influenced by the interaction between river power and ocean power. In order to transport the water and sediment into the sea, the estuary section is constantly adjusting its ratio and the length of the river so that the channel will develop into a relatively balanced state. The Yellow River huge amount of sediment into the coastal area, so that the coastline extends outward, while the isthmus of the coastal area also produce the corresponding changes. This paper starts with the analysis of the measured data, mainly investigating the regulation of the ratio drop and river length of the estuary of the Yellow River and the variation of the 15m isobath in the coastal area.