Reaearch Of Land And Ocean Interactions Progress Of The Coastal Zone In Jiangsu Province Since The Yellow River Flows Northward

Land-ocean Interactions becomes the hot spot of the research on the coastal zone and the forefront in global change research,in the past few years.from 1990's,the Land-ocean Interactions research and relevance studies had been carried out consecutively in every country.The Jiangsu coastal zone is controlled by the monsoon climate,lies in north subtropics zones to warm temperate zone transition.It is impacted by marine and continental double of climate and it's topography sediment types is rich, in that case,Jiangsu coastal zone is the ideal zone to start the LOICZ studies.Before the yellow river northward motion,the outstanding coast region was far more 20km away from recent coastline,meanwhile,it had extensive undersea delta out of estuary area.After adjusted and reformed for one and half century,the undersea delta is already deplanation and -15m depth line moves inwarda and has nearly 4 km distance from recent coastline.The silt from the Yellow river Delta and their undersea delta,moves southward and silt in here following the current,meanwhile,the sediments form the Yangtze River north part also silt here,the southern part coast continues becoming silted up with the most distant about 20 km,moving forward to the sea.The effect that acute change of the coastal line and undersea landform leading to tide wave propagation and the interaction between tidal wave system and coastal morphology are ignoredIn the recent research,we find the trends that the water channel and sandbar in north Jiangsu coast offsets gradually to south,such as Xiaomiaohong channel,LanshaYang channel and the south part of the radiation sandbar.consideing that Yellow river Delta coast is the main silt source and the revolving wave tide in Yellow sea spreads southward entering radiate sandbar area,passing the Yellow river delta,We can guess that the revolving tide wave reinforces causing by the corrodes recession of the old Yellow river delta may be relate with the chief axis of the channel sandbar system moving to south.Average sea level rise by ten centimeters in East China Sea is also worth to be considered in here.The Yellow Sea tidal wave system's causesd by the sea level rise change must affect the macroscopic background,but whether is the prime motors actuation factor which causes radiate sandbar trendy enolution,as well as relation between sea level rise and Jiangsu coastal erosion,its function's intensity and so on need to be far more researchedBy the large amount of reality measures data and numerical results,hydraulic and beach evolution characteristic of Jiangsu coast had been analyzed.Basing on restoring waterfront position and the undersea topography of destroy Yellow River delta coast in different developmental stage,since the Yellow River turning over to the northern,through establishing the wide range tidal wave mathematical model and the partial tidal current mathematical model,,the Yellow Sea tidal wave system's characteristic and the change in delta different evolution stages have been studied, correspondence relation and coactions between delta coast evolution and tide wave system's change have been analyzed;Jiangsu coastal tide wave system effecting by sea level rise have been studied,the driving force controlling evolution trend of radiation sandbar also have been discussed.Reach as follows series achievement:(1) The coastline and undersea landform change have lead the amplitude change of littoral partial tide in Jiangsu,which takes Yellow River mouth as boundary basically,to north,the amplitude is enhanced,to south the amplitude is diminishable, amplitude change in the radiate sandbar inner sea is maximum;Tide counting positions of the M₂,S₂ partial tide move unceasingly to southwest direction following the coastline recession.(2) With sea level rise,the partial tide amplitude will be increased,but diminish in some part area;meanwhle tide counting position of partial tide moves unceasingly to southeast direction;Tide amplitude change causing by sea level rising can be taken the Lvsi port as the boundary,to the north,partial tide amplitude enhances unceasingly,and to south it diminishes,especially in destroyed Yellow river it has less enhancement;The region where has the largest increasing partial teide amplitude also the palce which has the quickest erosion rate.sea level rising has a good relation with the beach erosion.(3) With the Jiangsu coastline retreating,the destroyed Yellow River undersea delta deplanation,revolution tide in south Yellow sea gets strengthen,the area that water driving force reinforcement is also that dynamic water chief axis direction has moved obviously to south clearly gradually to radiation sandbar excursion.This offsets of dynamic water chief axis may be the dominant factor that the radiation sandbar entirety moves to south.(4) With the rate of sea level rise being accelerated,the littoral tide amplitude arousing,off-shore flow rate enhancing aggravate as well as storm is damp,it effect in coast erosion is more and more bigger,the erosion of the coastal beach in Jiangsu coast is aggravate unceasingly...