Analysis on scouring and silting variation in the Jintang Channel

Based on 4 typical bathymetric maps of 1935,1962,1987 and 2004,the digital elevation model of the Jintang Channel was established to calculate the amount of variation in the erosion-deposition of seabed plane and the displacement of characteristic contour lines in different periods.Furthermore,the reasons of scouring and silting variation were preliminarily analyzed with observed hydrologic data and the layout of water conservancy waterway engineering in south and north shore areas.The result indicated that during the period of 1935-2004,the seabed plane of Jintang Channel was mainly characterized by slight scouring,of which the rate was 2.3 cm/a,while the tidal flat had been silting continuously.There were certain differences in the channel's scouring and silting in different periods,presenting a trend of change from erosion to deposition.This trend showed that the influence of human impacts was stronger than that of nature conditions.