江苏梁垛闸潮间带表层沉积物特征及输运趋势

采用激光粒度仪对2004年1月在江苏梁垛闸附近潮间带下部采集的36个表层沉积物样品以及垂向海岸的8个表层沉积物样品进行了粒度分析,获得了粒径分布和矩值参数的分布规律,结果表明:(1)江苏梁垛闸附近潮间带表层沉积物以粉砂为主,随着由海向陆水动力的减弱,沉积物粒度参数出现有规律的变化,由海向岸其粒径逐渐变细,分选变好,砂的含量逐渐减少,粘土和粉砂的含量逐渐增多。(2)运用G ao-Co llins二维沉积物粒径趋势分析模型模拟出了江苏梁垛闸潮间带的泥沙输运趋势,即该区的泥沙主要向北和北偏东16°左右方向输运,这种运动趋势主要受当地的潮流特征、地貌形态等因素的控制。

Surface sediment characteristics and transport trends in intertidal flat of Liangduo sluice, Jiangsu province

Sediment parameters mirror the depositional hydrodynamic conditions as well as the local sedimentary environment and deduce the transport trends.36 surface sediment samples were collected on the mud flat and 8 surface samples were collected on the S.alterniflora flat of Liangduo in Jan,2004.All of the samples were analyzed using Malvern 2000 laser particle size analyzer.The result shows that 2 types of sediment have been identified: silt and sandy silt count for the percentages of 90.3% and 9.7% respectively;accompanying with the declining hydrodynamic conditions,the grain size decreases and thus the sorting coefficient becomes better from ocean to shore.The trends indicate that the sediment mainly transports northward and northeastward: the surface sediment characteristics and the transport trends are related to and controlled by the local environment conditions such as tide regimes,local landscape and the vegetation cover etc.