GEOMORPHOLOGICAL EVOLUTION OF THE BARRIER-LAGOON SYSTEM NEAR THE JINGTANG PORT, HEBEI PROVINCE

The barrier-lagoon coast of Hebei province is gradually varnishing by both natural factors and human activities, and the sandy coastline is continuously eroding. Based on 4 times of monitoring for 15 beach profiles near the Jingtang Port in summer and winter seasons, the spatial and temporal variation in geomorphology and grain size distribution pattern of the surface sediment was studied. The results show that the coast is now under erosion as a general trend. Erosion and siltation alternate in the Yongle Island and Mingyue Island. However, the Jixiang Island is less effected by human activities, but suffers serious erosion, and the residual sand bars has been eroded by 10~30 m in 2 years. Surface sediment monitoring in 2016 indicated that the deposits become coarser in winter. Because of the severe erosion of sand beaches in some profiles, the silt basement was exposed, which resulted in the fining of sediments.