黄河口近期环境演变与河口治理

ENVIRONMENTAL EVOLUTION OF MODERN YELLOW RIVER MOUTH

本文分析了近几年来尾闾河道及河口滨海区实测资料，认为尾闾河道河相关系趋向于转好，河口变化造成的溯源冲淤作用影响范围仅有２０几ｋｍ，并且只有在汛期水流强度较大时，才发生溯源调整作用，非汛期淤积严重。由于河口砂咀向海凸出，三角洲前缘形成强流带，加上波浪作用及异重流发育，河口砂咀延伸速度明显减缓。最后，作者对目前河口治理中存在问题的解决提出了建议，尤其指出不应轻易放弃目前良好的河口行水环境。

We have analysed the data from the lower reaches of the Yellow River and coastalarea measured since 1987 in this paper.The result showed the the river relation became better and better and the deposition distance related to mouth growing into the sea wasonly 20km when the river floods. When the river floods, the channel is deposited seriously due to high sediment concentration of the Yellow River.Because of prominent mouth sand body in the sea, a strong tide current zone has been formed in the delta front since 1982. Lately, the mouth area is deposited slowly due to the silts transported by the strong tide current. hyperpycnal flow and wind wave. In the paper, some advices abut controlling the Yellow River mouth area have been discussed.They are as follows:(1)Because the strong water dynamic environment in modern river mouth is useful to disperse the Yellow River silts into the sea, the lower reach channel should be used for several years.(2)By building the artificial bank along the channel from Qing 3 to Qing 7. the high river bed reach can be controlled.(3)Dredging the higher mouth bar. the danger of channel broken in flooding phase can be decreased.