Characteristics of modern sediment from Pikou to Dachangshan Island

In Sep.2003,the comprehensive survey and estimate of ocean resources from Pikou to Dachangshan Island were carried out.More than ninety and three core sediment samples were collected.The bottom sediment type and its distribution feature from Pikou to Dachangshan Island area were analyzed.Using 210Pb dating,rates of the modern sediment accumulation in the sea area were determined.In addition,the sedimentation speed was discussed.The results showed that fine particle sediment type is the main sediment type,which has the sedimentation characteristics of silt shore belt.It is revealed that the settling rate by 210Pb dating in north tidal beach is larger than in both coastal slope beneath and north Dachangshan Island area.The mud and sand from coastal Yalujiang River,Dayang River,Biliu River and Zhuanghe River is an important role in the distribution of sediment type in the research sea area.