【摘要】 本文利用2006—2010年在广西沿岸海域获得的409个表层沉积物样品和2个站位的水文观测资料,通过沉积物粒度参数、Gao-Collins粒径趋势分析、以及表层沉积物输运通量的计算,探讨了该区域表层沉积物的粒度分布与输运特征。结果表明,研究区表层沉积物以粉砂和砂为主,主要类型为泥、砂质泥、粉砂、泥质砂、砂、含砾泥质砂、含砾砂、砾质砂;中值粒径范围跨度较大;分选系数由岸向海逐渐变大;大部分区域呈极正偏态。研究区沉积物输运趋势整体上有向岸输运的趋势。在防城港南侧海域和雷州半岛西侧分别有一个汇聚中心,廉州湾附近沉积物向湾内堆积。潮流作用下表层沉积物输运通量的研究表明,该海域的日平均单宽输沙通量较小,与表层沉积物的运移趋势一致,净输砂方向受潮流流速和持续时间的影响。更多还原

【Abstract】 Based on 409 surface sediment samples which were collected in 2006—2010 in the Guangxi coastal water and hydrological observations in 2008 and 2011,the authors studies the spatial distribution of sediment types,uses Gao-Collins particle grain size method to analyze transport trend of the surface sediments,and conducts the net transport flux of surface sediment.Main sediment types in the study area are mud,sandy mud,silt,mud sand,sand,pebbly mud sand,pebbly sand and gravelly sand.Median diameter in the study area varies in a large range,sorting coefficient increases from the nearshore water to the offshore water and skewness in the most of this area is positive.The transport trend of sediments is from the sea to the land and convergent centers appear in the Fangchang Bay and the western side water of the Leizhou Peninsula.Sediments around the Lianzhou Bay accumulate in the Beihai Bay.The net transport flux caused by tide current per day is low,and the figure is consistent with the particle size trend analysis.The net transport trend is influenced by the current speed and duration.更多还原