摘要:
基于遥感影像资料和实测水文泥沙资料,对广利河口海域悬沙分布特征和黄河口入海泥沙扩散进行了分析研究。结果得出,在一般天气情况下,广利港海域工程海域含沙量比较低(3),黄河口泥沙向南直接扩散距离为10~20 km,对工程区无直接影响,但是在大风天气下,广利河口附近海域含沙量会增高至0.5 kg/m3以上,黄河口入海泥沙扩散向南可达30~40 km,最远可达小清河口,对工程区则有一定的影响;从广利港海域含沙量、底质特征、冲淤性质上来看,黄河口泥沙扩散对工程区是有限的,造成航道和港池淤积的主要泥沙来源为风浪和潮流作用下就地泥沙的搬运输移;黄河入海泥沙呈减小趋势,黄河改由"清8断面"入海,黄河入海泥沙浑水主轴线与广利港的距离增加,对工程区的影响趋于减小。
Abstract:
Based on the remote sensing and measured data, we studied the suspended sediment distribution off Guangli and the influence of sediment diffusion from the Yellow River estuary. The results show that: (1) in a fair weather condition, the sediment concentration is less than 0.1 kg/m3 in the study area, and the straight distance of sediment diffusion from the Yellow River estuary to the south is only 10~20 km. In the strong wind condition, however, sediment concentration rises to 0.5 kg/m3 or above, and the diffusion distance to the south reaches 30~40 km that brings certain influence to the study area; (2) based on the sediment concentration, sediment grain size and silting / scouring characteristics of the Guangli harbor waters, it is revealed that the sediment diffusion from the Yellow River estuary is limited. The main sediment sources which caused deposition in the waterway or the basin are those transported by the joint action of wind waves and tidal currents; (3) since the sediment from the Yellow River estuary is in a trend of decrease, the influence of the sediment diffusion of the Yellow River is getting smaller.
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