DISTRIBUTION PATTERN OF SURFACE SEDIMENT OFFSHORE SANG ISLAND OF LONGKOU
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摘要: 根据桑岛附近海域184个表层沉积物样品的粒度测量结果,分析了表层沉积物类型、分布特征和粒度参数变化规律,并探讨了影响沉积物分布的主要因素。结果表明,桑岛附近海域表层沉积物主要包括砂质粉砂、砂质砾、砾石等7种类型,砂质粉砂分布广泛,含砾的粗粒沉积物主要分布在桑岛周边近岸,细粒组分高值区主要在远岸地区。沉积物分选程度总体上呈中等,偏态值基本都是正值。桑岛南侧水道和依岛北侧表层沉积物起动流速小于最大潮流流速,潮流作用在此处明显;砂质海岸和桑岛北侧海岸沉积物主要受波浪作用影响。Abstract: Based on grain size data of 184 surface sediment samples, we studied the types of surface sediment and their distribution pattern in the offshore area of the Sang Island. Grain size parameters are presented and the major factors controlling the sediments distribution discussed in this paper. The sediment of the area can be divided into 7 types, such as sandy silt, sandy gravel, gravel, etc. The sandy silt is widely distributed in the study area and the pebbly coarse sediment is mainly distributed in the coastal area of the Sang Island. Fine grained components are widely distributed in the far offshore region. The sediments are fairly sorted with positive skewness. As the initiation velocity of surface sediment is below the maximum tidal current, the sediment in the north of the Yi Island and the waterway located to the south of the Sang Islands is controlled by the tidal current. In contrast, the sediment near the beach and north coast of the Sang Island is controlled by waves.
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Key words:
- Sang Island /
- surface sediment /
- distribution pattern /
- grain size parameters
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