福建围头湾悬沙输移机制分析

Mechanism of suspended sediment transport in Weitou bay in Fujian

根据福建围头湾大潮期间潮汐、潮流、悬沙实测资料,分析水流输运,同时利用机制分解法,将悬沙净输移通量分解为平流项、潮泵效应项和垂向净环流输移项,对悬沙输移的动力机制进行分析讨论。结果表明:金门岛东侧余流,部分流向湾口,部分流向安海湾。金门岛与大嶝岛之间的余流,沿涨潮流向湾内,悬沙净输移方向和余流方向保持一致;平流输沙对悬沙净输移起主导作用;水域潮泵输沙贡献较大;垂向净环流输沙影响较小。

According to tide and suspended sediment data of Weitou bay in Fujian during spring tide, the wa-ter transport was analyzed and the net transport flux of suspended sediment was divided into advection term, tidalpumping effect term and vertical circulation transport term by use of mechanism decomposition method. A discus-sion was made on the dynamic mechanism of suspended sediment transport. The result shows that part of the residu-al current in the east of Jinmen island flows to the bay mouth and part flows to Anhai bay. The residual current be-tween Jinmen island and Dadeng island flows to the bay. The direction of suspended sediment transport is consis-tent with that of residual current. Advection effect is a dominant factor and tidal pumping effect term plays an impor-tant role in suspended sediment transport. The vertical circulation transport term has a small proportion.