淤泥质海岸浮泥形成条件定量研究

Quantitative analysis method for forming condition of fluid mud at muddy coast

从物理特性、形成过程、形成条件等角度出发,研究了淤泥质海岸浮泥与异重流之间的异同,提出了浮泥形成条件的定量研究方法,并对其应用进行了探讨。结果表明,浮泥形成前期的含沙水体具有异重流特性,可采用异重流发生判别公式来定量描述浮泥形成条件中的水流流速、含沙量、水深三者之间的关系,由此求出浮泥形成的临界含沙量;结合连云港进港航道具体情况,认为随着航道等级的不断提高,航道水深也在不断增加,形成浮泥的临界含沙量则相应降低,更易在航槽内形成浮泥。

From the view point of physical characteristics, the forming process and forming conditions, fluid mud, sediment-induced density current and their relationship are analyzed in detail. The quantitative analysis method for studying forming condition of fluid mud is established reasonably. And its application is discussed in detail. The results show that the feature of turbid water before developing into fluid mud is similar to sedi- ment-induced density current. The three parameters of water velocity, sediment concentration and water depth for fluid mud formation are corresponding to those for sediment-induced density current formation. That is to say, it can be quantitatively researched on fluid mud by means of the function which describes the occurring of density current. Then, the critical suspended sediment concentration for forming fluid mud can be calculated. Furthermore, according to the layout of navigation channel of Lianyungang port, it is concluded that the form- ing condition for fluid mud will be easily satisfied by decreasing the critical suspended sediment concentration due to increasing of the navigation channel rank.