厦门湾及邻近海域沉积物分布特征和沉积速率

2007年和2010年在厦门湾及邻近海域进行底质表层沉积物和柱状岩心样品采集,并进行粒度分析及粒度参数计算,获得了研究区底质表层和柱状沉积物样品的粒度分布特征.结果表明,厦门湾海域沉积物类型多样,以粉砂质砂和砂质粉砂为主.平均粒径介于?1.5Φ~7.5Φ之间.采用 Gao-Collins粒径趋势分析方法,发现九龙江口的沉积物主要呈东南方向净输运,而大金门南侧海域沉积物则有向九龙江口输运的趋势,同安湾内沉积物由海岸向湾中央输运;厦门东部海域沉积物向北输运,翔安南部海域沉积物向同安湾口以及澳头近岸输移.对柱状岩心进行放射性同位素210Pb 测年分析,计算得到九龙江口沉积速率为2.62 cm/a,进而探讨了九龙江口的沉积环境演化特征,研究成果可为区域资源开发和环境保护提供科学依据

Sediment distribution and deposition rate in the Xiamen Bay and adjoining waters

The bottom,surficial,and core sediments were collected from the Xiamen Bay and adjoining waters in 2007 and 2010.The sediments were analyzed to obtain the particle sizes distribution and parameters.The analysis showed that the contents of sediments varied,mainly including silty sand and sandy silt.The mean particle size was 1.5Φ ~ 7.5Φ.The Gao-Collins grain size trend model was applied to estimate the net sediment transport pathways in the investigation areas.The sediment transported southeastward in the Jiulong River Estuary,and towards this estuary from Dajinmen area.In addition,the sediment transported offshore to the central bay in Tonganwan area.The sediment transported towards north in the eastern Xiamen sea,and towards the mouth of Tonganwan and onshore of Aotou.The sediment core was analyzed using the210Pb dating method.The deposition rate was 2.62 cm / a in the Jiulong River Estuary.The above results and conclusions could be utilized in regional resource exploitation and environmental protection.