Response of drowned river valley estuary - tidal inlet bay towards human activities in the past 50 years: a case study on the Dingzi Bay, Jiaodong Peninsula, China

The Dingzi Bay is chosen as the study area with its response of dynamic geomorphic evolution process towards human activities in the past 50 years being studied based on RS (Remote Sensing), GIS (Geographic Information System), GPS (Global Position System), Fractal analysis and Waterline Extraction, tec. The result suggested the dynamic geomorphy have experienced remarkable changes in the past 50 years, it experienced 2 alternations between flood asymmetry and ebb asymmetry with regard to the dynamic geomorphic evolution behaved different stages in the past 50 years. An advanced (improved) pattern adapted to drowned river valley estuary - tidal inlet bay with affected profoundly by human activities was concluded, in the pattern, human activities influence the flood (ebb) asymmetry via changing of average water depth of flood (ebb) tide. According to the result, estuarine dynamic geomorphic conditions can be changed profoundly through human activities, and the bay also adapts the new boundary conditions promptly. The result not only enriches the researches of the response estuarine geomorphic process to human activities and land-ocean interactions (LOICZ) based on global change, but also helps to understanding the impact the rapid economy development to the coastal nature environment in Jiaodong Peninsula in recent decades comprehensively, and thus provide estuarine geomorphy theoretical support for sustainable economic and social development of coastal zone.