INFLUENCE OF VARIATION OF WATER-SEDIMENT PROCESS ON THE COASTAL LINE IN THE YELLOW RIVER DELTA

Abstract: Coastal line erosion and delta area decrease are becoming a hotspot for governments and scientists in the world．The trend and speed of forming land restrict the economic development and ecological environment improvement in delta area．According to coastal line changes during the high tidal periods of l976,1986,1992，1996，1997,and l998，the trend of progradation and erosion of the Yellow River delta was studied．The results show that the coastal 1ine progradation and erosion are proceeding simultaneously，and generally the formed land area in the delta is decreasing．The analysis results of water discharge and sediment load from 1950 to 2001and their relation to the formed land area show that when sediment load is 245 ×106t ， delta the Yellow River delta will arrive rough balance of progradation and erosion