Long-term evolution trend prediction for Huangmaohai Sea river bed
According to such characteristics of the estuarine area of Huangmaohai Sea as the significant wave current interaction,the complex sediment movement and the obvious spatial structure,a tidal current and sediment mathematical model of two-dimensional dynamic boundary under the joint action of wave and current flow is established,combining with the third generation wave model SWAN and considering the effect of waves on the sediment carrying capacity.On the basis of analyzing the actual observation data,designing the water and sediment series and verifying the model,the simulation prediction of the longterm evolution of Huangmaohai Sea is realized.The predicted results show that after 20 years,the west beach silting body of Huangmaohai Sea extended southeast,and the contour lines-2mand-3mon the northwest side of Dajin Island extended outward significantly;and the contour line-5mon the north side of Dajin Island extended eastward about 1 400m;the central sand body of Lanmen Sand Beach continuously silted higher,and the Beach extended southeastward,and the contour line-5mextended southeastward about 2300m;the east shoal extended slowly,and the south end of the contour line-3msilted southward long,whose west side is to be eroded slightly and whose east side silted slightly long;the island shadow region of Wankou Island is to be gradually silted shallow;and the contour line-5mbetween Damang Island and Hebao Island will move eastward and westward obviously;and the contour line-10 mon the south of Gaolan Island will move outward about 1 200 mwith the obvious changes.The predicted results and the overall trend reflected by the data analysis are basically consistent.The extending direction and the rate of trough growth were generally consistent with the evolution rules obtained by the recent actually-observed data.