南汇边滩的沉积特征和沉积物输运趋势

在对南汇边滩沉积物粒度特征进行分析的基础上,利用Gao Collins泥沙概率输运模型探讨边滩的沉积物输运趋势,结果表明：①沉积物中值粒径、分选系数和偏度的分布具有一致性,三者相关性较强;②边滩的沉积物粒度特征表现为正偏,分选性较差,分选系数值集中在2左右,沉积物相对较粗（中值粒径大于0.01 mm）的区域主要集中在没冒沙中部、南汇咀及卢潮港近岸,其它区域沉积物相对较细（中值粒径小于0.01 mm）;③将 Gao Collins的泥沙概率模型和南汇边滩的动力与沉积环境结合表明,沉积物在东滩的净输运趋势是由北向南输运。由于南滩的动力条件相对复杂,因此南滩沉积物的净输运趋势有待进一步分析。

SEDIMENT CHARACTERISTICS AND TRANSPORT PATTERNS IN NANHUI JOINT AREA

Based on the analysis of the grain size characteristics of the sediment in Nanhui joinit area between Changjiang and Hangzhou bay,the net transport trends in Nanhui area are studied by using "Gao and Collins" model.The results are shown:(1)The trend is similar to the distribution of the grain size parameters including the medium grain size,the sorting coefficient and skewness,where the relationships of three parameters have a strong correlation;(2) The grain size characteristics in Nanhui exhibit positively skewed and poorly sorted with a value concentrated around 2.The distribution regions of the sediment with fine grain size(<0.01mm) are located in Nanhui area except for the regions including medium is distributed sector of Momaosha,Nan Huizui and nearshore zone in Luchao harbor where coarse sediment(>0.01mm);(3) Combined "Gao-Collins" mode with the characteristics of the dynamics and sediment in Nanhui,it's indicated that the sediment transport patterns are from the north to the south in East bank,but the sediment transport trends in Nan bank should be further analyzed because of the conditions of the complex dynamics in Nan bank.