伶仃洋沉积动力特点的研究

A STUDY ON NOTABLE FEATURES OF SEDIMENTARY DYNAMICS IN LINGDINGYANG ESTUARY OF ZHUJIANG RIVER

位于珠江三角洲东侧的伶仃洋，因径流下泄与潮流进退的流向不一，使它各分流口门的出口水道都有主槽和支槽之分，即都有主干水道和分汊水道。陆架高盐海水入侵又使伶仃洋内沉积动力过程在空间分布上发生差异，如沉积物分布有粗－细－稍粗之分；而水体中的密度、速度差异，常常产生锋带，对水下地形的发展有不可忽视的影响。因而全面认识发生在伶仃洋内的沉积动力作用，对深水航道的选线极为重要。

he Lingdingyang Estuary is located in the southeast of Zhujiang River Delta. Because of the difference of flow directions between the runoff and the tidal current, the channels are distributed to a master trough and a branch trough. In addition, when the shelf saline water intruding there that make the difference of sedimento-dynamic process and sediment-grain distribution in spatial, i.e. coarse, fine, and fairly coarse from upper to lower regions. As there are enough gradients of density and velocity in waters, the fronts would be formed,that can hot be neglected for the formation and evolution of submarine topography. So, to recognize the sedimento-dynamic process on all sides will be of much significance for selecting deep navigation channel in Lingdingyang Estuary.