【摘要】 利用2010年秋季在唐山湾潟湖沙坝(石臼坨、月坨和打网岗)周边海域实施的表层沉积物粒级的大面站调查资料,阐述了唐山湾潟湖沙坝附近海域的沉积物粒级及其分布特征,并结合同步实施的水文观测结果,初步分析了调查区的沉积动力条件。研究结果表明,唐山湾潟湖沙坝周边海域的平均粒度为4.18Φ,沙坝体近岸5m等深线以浅海域以单峰分布为主,5m等深线以深海域则为双峰分布,潟湖潮道处以单峰分布为主,潟湖内自潮道由东向西逐渐演变为三峰、双峰和单峰模式。调查海域的破波带以浅海域泥沙运动主要以跳跃搬运和推移搬运为主,以深海域中悬浮搬运逐渐占优。研究还表明打网岗岸线侵蚀程度不均匀,中北部岸段侵蚀较为严重。更多还原

【Abstract】 The surface sediment size fraction and its distribution characteristic were illustrated by the investigation in barrier-coast in Tangshan bay in October,2010.Based on the synchronous hydrological observation,sediment dynamic condition was preliminarily analyzed.The results show that the average grain size was 4.18Φ.There were three grain size distribution modes,unimodal distribution within isobath of 5 m,bimodal distribution outside of isobath of 5 m,in tidal channel gradually evolved into trimodal distribution,two peaks and the single peak pattern.In shallow waters,the sediment transport mode was mainly jump and bed load,but suspended load was dominated outside of isobath of 5 m.The research also shows that cocestal erosion of Da Wanggang sand barrier was uneven,the more serious erosion occered on north-central coast.更多还原