泉州湾泥沙运移与冲淤变化

运用"粒径趋势分析"方法研究泉州湾泥沙净输运趋势,借助210Pb测年法测定湾内北水道的沉积速率,并通过海图对比计算海湾冲淤变化.结果表明,泉州湾总体处于淤积之中,但湾内冲淤分布不平衡:北水道淤积程度重,其中上游是湾内的现代沉积中心;南水道是泥沙输运出湾的主通道,局部略微侵蚀.湾内涨、落潮流路的平面分异和地形条件的制约是北水道淤积的主要原因,强劲的落潮流以及径流是南水道成为泥沙输运主通道的主要动力条件.

Sediment Transport and Changes in Scour and Silting in the Quanzhou Bay

In this paper, the grain size trend analysis method is used to study the net sediment transport trend in the Quanzhou Bay, the sedimentation rate in the north channel of this bay is determined by using 210^Pb dating method, and the changes in scour and sitting in this bay are calculated by means of comparison between nautical charts. It is shown from the study results that the Quanzhou Bay was generally in a siltation state, but the scour and siltation distributions in this bay were uneven, that is, the north channel was heavily silted with the upper reaches of north channel being the modern sedimentation center of this bay, and the south channel became the main pathway for sediment to transport out of this bay, and slight scour occurred in some areas of south channel. The horizontal differentiation between flood flow path and ebb flow path and the constraint of topographic conditions are main causes for siltation in the north channel, and the strong ebb current and runoff are main dynamical conditions for the south channel to become the main pathway of sediment transport.