Spatiotemporal variation characteristics and sedimentation rate of sediment grain size in Fangchenggang Sea of Guangxi
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摘要: 为了解防城港海域沉积演化规律,对防城港近岸海域垂直海岸线方向上的5个柱状沉积物进行粒度分析和210Pb同位素测年,分别得到5个柱状样的粒度参数变化特征、沉积物类型,同时计算沉积速率并结合防城港地貌及人类活动分析了物质来源、沉积动力及沉积速率影响因素。结果表明: 柱状样FC13Z、FC16Z及FC12Z在深度60 cm以上层位的粒度参数变化范围相对较小,表明其所处的沉积环境相对较稳定,柱状样FC14Z、FC15Z及FC12Z在深度60 cm以下层位的粒度参数变化范围相对较大,表明其所处的沉积环境相对波动; 沉积物分选性较差-差,偏态属于近对称-正偏,峰态很平坦; 研究区柱状沉积物可分为砂质粉砂、粉砂、砂质泥、泥质砂、含砾泥质砂、含砾泥和泥7种类型; 由近岸到前缘沉积物以砂为主逐渐过渡为以泥为主,沉积速率呈现出逐渐降低的趋势; 沉积物来源主要为河流输入及沿岸侵蚀物,沉积动力主要来自于潮流和近岸流系; 沉积速率受潮流影响较大。研究结果可为防城港近岸海域沉积环境与地貌演变研究提供参考依据。Abstract: Sediment particle size characteristics are important parameters reflecting sedimentary environment. In order to understand the sedimentary evolution law of Fangchenggang Sea area, the authors carried out grain size analysis and 210Pb isotope dating on five core sediments in the vertical coastline direction of Fangchenggang coastal waters, and obtained the grain size parameter change characteristics, sediment types and sedimentation rates of the five core sediments respectively. The Fangchenggang landform and human activities, the material source, sedimentation dynamics and sedimentation rate influencing factors were also considered. The results show that the variation range of grain size parameters of FC13Z, FC16Z and FC12Z above 60 cm is relatively small, indicating a relatively stable sedimentary environment. While, the variation range of grain size parameters of FC14Z, FC15Z and FC12Z below 60 cm is relatively large, indicating a relatively fluctuating sedimentary environment. The sediment sorting is relatively poor to poor, and the skewness is nearly symmetrical positive, with a very flat peak. The core sediments in the study area can be divided into seven types: sandy silt, silty sand, sandy mud, argillaceous sand, pebbly argillaceous sand, pebbly mud and mud. The sediment from the nearshore to the front edge gradually converts from sand dominated to mud dominated, and the sedimentation rate shows a significant weakening trend. The sediment source is mainly from river input and coastal erosion, and the sedimentary power mainly comes from tidal current and nearshore current system. The sedimentation rate is greatly affected by the tidal current. The results of this study would provide some references for the sedimentary environment and geomorphological evolution study in the coastal waters of Fangchenggang Sea.
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Key words:
- Fangchenggang Sea /
- grain size parameter /
- sedimentation rate /
- sedimentary dynamics
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