Investigation and numerical simulation of summer sedimentation in Jiaozhou Bay, China

In recent years,development activities have had a significant impact on the environment of the Jiaozhou Bay,China.To ensure the sustainable economic and social development of the Jiaozhou Bay area,it is necessary to strengthen corresponding control measures.The important prerequisite is to properly understand the environmental conditions laws of natural change,especially the dynamic processes of sediment and the characteristics of landform evolution.Based on the data of continuous observation at 6 stations in Jiaozhou Bay for 25 hours,the Hydrodynamic Eutrophication Model(HEM-3D)was used to simulate the sediment erosion and deposition.The results show that the maximum suspended sediment concentration in the sea area of Jiaozhou Bay is about 40 mg/L,which appears in the northwestern area of the bay top and the Cangkou watercourse area,and the low concentration is located in the area of the central Jiaozhou Bay towards the bay mouth.The suspended sediment is 6?10 mg/L.Affected by a decrease in seawater material,the direction of the prevailing current in the Jiaozhou Bay area is different from that of the sediment transport.The velocity of the flood current is higher than that of the ebb current.However,during flood tide,the flux of resuspended seafloor sediment outside and at the mouth of the bay is limited and cannot contribute significantly to the suspended sediment in the bay.During ebb tide,the resuspended sediment at the shallow-water bay head and the east and west sides spreads toward the bay mouth with the ebb current,although it extends beyond the bay through the bay mouth.The research results can provide scientific support for the Jiaozhou Bay project construction and environmental protection.