Evolvement of the muddy coastline and theirs environmental effects in Hebei Province
人工干预下河北省淤泥质海岸岸线演变及其环境效应分析

The data of this paper were mainly from relief maps, charts, remote sensing imagines, and the field data of different years and areas in Hebei Province from 1956 to 2006. Combined with the software of GIS and the results of field work, the evolution process and the motivation condition of muddy coastline had been investigated after comparing above materials. In addition, the paper had analyzed the environmental effects by the change of surrounding beaches. The results showed that the reason of the evolvement had changed from the natural factors to the artificial factors. The type of factors was different from times, which included the salt fields in the begining, breed aquatics ponds and the ports in the last. The region of the most important development had also changed at different times. It gradually moved to the south in Cangzhou City, while to the west in Tangshan City. The change of the shoreline in Huanghua Port caused by many environmental factors, such as modifying the direction of the long-shore sediment, the balance condition of the beach, and the type of the sediment on the beach. Meanwhile, the change of the shoreline in Caofeidian Port interdicted tide on the riffle, which caused the beach to fill up nearby the road to the Caofeidian Island and the west of Nanpu. Moreover, it also affected the evolvements of the other islands and the offshore bars. It is of important practical significance to use coastal resources and to develop coastal zone rationally, to achieve sustainable development of environment and economic in coastal region.