福建兴化湾近岸地貌特征与泥沙来源分析

在现场地貌调查及沉积物取样分析的基础上,对兴化湾的自然条件、沉积特征、泥沙来源及运移趋势进行了分析。判明石城岛以西水下沉积物以粘土质粉砂分布为主,泥沙粒径在0.01 mm左右,为河流下泄泥沙沉积为主。石城岛以东局部区域沉积物质为极粗砂,为近岸山体及浅滩冲蚀物质沉积为主。兴化湾的泥沙主要为河流输沙,其次是周边沿岸冲蚀入海物质及岬角岛礁受风浪侵蚀泥沙。由于湾外涨、落潮流路的稳定和潮流动力的强劲,湾内水深地形与潮流动力有很好的对应性和稳定性,泥沙运动仅限于湾内泥沙的再搬运。

Analysis of geomorphic characteristics and sediment source of near-shore area in Xinghua Bay

Based on site topography survey and sediment sampling analysis in Xinghua Bay,natural conditions,sedimentary characteristics,sediment source and transport tendency were studied.The results show that the underwater sediment in the west of Shicheng Island is mainly consisted of clayey silt,and the sediment grain size is about 0.01mm.The sediment in the east of Shicheng Island is mainly consisted of very coarse sand,and it is mainly from the coastal mountains and shoal erosion.The sediment in Xinghua Bay is mainly from river load,followed by peripheral coast erosion material and Cape Island sediment eroded by wind waves.Because of the stability of the flow path in flood tide or ebb tide and a strong driving force of tide current in the outer of the bay,the topography and tidal dynamics have a good correspondence and stability,and the sediment movement is restricted to the sediment transported inside the bay.