摘要
总结了海河口的历史变化过程,通过实测资料分析了海河口建闸后的淤积情况、目前的淤积形态及其主要原因,认为河口建闸30a来,在径流量逐渐减小的条件下,潮汐水流是塑造闸下淤积形态的主要动力.指出口外潮汐环流作用对拦门沙前缘及其主槽的淤积有控制作用,而且近闸段始终具有一定的纳潮量.使得口外涨落潮进出近闸段的水流,在过渡段具有较大的流速,从而控制了淤积高程,这对维持河口具有良好效果.
The historic evolution process of Haihe estuary is summarized. The deposit status after 30-year operation of floodgate at the estuary is analysed. The tidal current is the major dynamic factor affecting the deposit status on the downstream side of the gate, while the runoff of the river has been dwindling for the period. It is revealed that the tidal circulation at the estuary is in the control of sandbar fringe and the deposit in the main channel of the river. The near- zone downstream side of the gate has a certain capacity of tidal influx, resulting in considerable tidal current speed when it moves within the middle-zone downstream side of the gate, which plays an active role in controling deposition elevation and maintaining the shape of the estuary.
出处
《海洋通报》
CAS
CSCD
北大核心
1995年第1期37-45,共9页
Marine Science Bulletin
