The research of sedimentary environment of Gaizhou Shoal at Liaohe Estuary in recent 30 years
This paper analyzes the sedimentary environment of Gaizhou Shoal in recent 30 years based on the grain size analyses and 137 Cs and 210 Pb dating of sediment samples from the core,collected from the north of Gaizhou Shoal,combining with remote sensing images of 1988,1994,1999 and 2013.The results show that the type of sediment are sandy silt and silt with poor sorted,fine skewed and platykurtic.The deposition rate of Gaizhou Shoal in recent 30 years is rapid with 2.83 cm/a.The annual runoff and sediment discharge of Liaohe River decreased after the building of Panshan sluice in 1969,and the grain size of sediment of Gaizhou Shoal was restricted by run-off,tidal current and wave while the runoff was the main factor.Liaohe River was closured in 1999,and then the effect of runoff weakened while the effect of tidal current enhanced.The development process of Gaizhou Shoal was affected by runoff,tidal current,wave and human activities,but the main form of Gaizhou Shoal has no significant change in recent 30 years,while the northern increased and connected with the main shoal,and the southern was birdfoot because of wave reforming.
NETL
NSTL
万方数据
维普
