闽粤交界的大埕湾岸滩稳定分析及岸滩防护对策

Stabilization analyses anderosion protective countermeasuresof shore -beach along Dacheng Bay on boundaryof Fujian-Guangdong Provinces

本文在实地调查的基础上,通过对大埕湾沿岸输沙率变化和岸线形态的分析,综合探讨了该海湾的泥沙来源,沿岸泥沙迁移特征,岸滩冲淤动态以及海岸的演变趋势.结果表明:该湾沿岸带形成了一股朝W向迁移的波生泥沙流,泥沙主要来自诏安湾和宫口湾;该湾海岸除东部沙坝泻湖岸段略有淤伸外,其余岸段均处于侵蚀状态;随着泥沙来源的减少,海岸内凹蚀退是今后岸线调整的自然过程.文中还对大埕湾岸滩的防侵蚀提出了相应的对策建议.

On the basis of the spot surveying, silt origin, longshore sediment moving features, shore-beach scouring-silting changes and coastal evolution tendency of Dacheng Bay were studied by analyzing the longshore sediment transport changes and the coastal shape pattern. The result showed that the longshore zone of the bay has presented a wave-induced westward silt flow, in which silt is mainly from Zhao' an Bay and Gongkou Bay; the coasts of the bay are basically in erosion status except barrier-lagoon coast which situated in the eastern section is slightly silting; and with the decrease of silt origin, it is natural process of coastline adjustment of the bay that the coasts will show erosion-recession from now on. In the meantime, appropriate countermeasures have been put forward for erosion protection of the shore-beach along Dacheng Bay.