Such As The Study Of The Dynamic Characteristics And Mechanism Of The East Coast

Radial Sand Ridges Area central and southern coast has kept silting into the sea for years due to the southern movement of eroded materials in the north,the protection and sediment supply of radiation shoals along the shore.However,in the case of decreasing sediment supply,the two wave system has great influence on the study area,and the dynamic conditions are complex and changeable.At the same time,it is particularly important to analyze and study the characteristics of the erosion and siltation in the south of the middle and south of the radiation sandbar under the joint action of large scale reclamation.This paper is used to reveal that evolutional characteristics of tidal flat by the arrangement and analysis of data about Marine topography,hydrology,remote sensing image of Rudong,with the application of GIS,RS,Delft3D mathematical model and so on.Meanwhile,the evolution of HuangSha Channel and LanSha Channel is studied by means of analysis of remote sensing images.Considering sea water hydrology power field,sediment source and sediment transport characteristics,the evolutional characteristics of the erosion and deposition in Rudong tidal flat are set forth in the multi-angle and the evolution is predicted qualitatively.Based on the measured terrain data,the erosion and deposition characteristics of the typical coastal beach are analyzed based on GIS and DEM methods.Research shows:In the 2009-2014 years as a whole,the amount of siltation in the northern block is larger than that in the scouring area,and the net deposition is 3.7×107m3.The contour line is characterized by shore erosion,deposition on the far side,and deposition in the whole.All the above sections are mainly convex and concave,and all of them are alternately scouring and silting.In the 2005-2015 years of the southern block,the siltation is larger than the scouring volume,and the net deposition is 0.3X 107m3.The contour line is nearshore silting and far shore scour,and the alternation degree of each section is more intense than that of the northern block.In the past 2005-2017 years,the total amount of erosion in the coast near sunshine island was larger than that in silt,and the net erosion volume was 1.4×107m3.The depth of the bathymetric line is mostly scoured.According to the change of the topographic profile of each section,the overall shape of each section is roughly similar,and the near shore is characterized by the alternate state of erosion.On the far shore,due to the influence of the rotten Shayang South waterway,each section is shown to be a trend toward the shore.Based on RS and Delft3D mathematical model,the mechanism of coastal beach evolution was analyzed.It turns out,Intertidal flushing and silting alternation.The factors affecting the evolution of the beach include the influence of the construction period and operation period of the offshore works,Influence of upstream sluice on flood discharge and drainage during operation of nearshore works and the change of the waterway.At the same time,the swinging of tidal flats in some areas will also affect the tidal flat.