Seasonal Variation Research Of Suspended Sediments In The East China Sea Based On Remote Sensing

To study the spatial and temporal characteristics and distribution of suspendedsediment in eastern China seas, the paper analyzes the factors that control thedistribution and the significance of suspended sediment, and ultimately, we canpredict the future sedimentary characteristics of the eastern China seas.This paper introduces the " Extracted suspended sediment concentration and seasurface temperature data from satellite remote sensing data in batch with ENVI/IDL" method, which is low cost, high efficiency and high precision, greatly reducing thetime data processing.With this method, the NOAA-19AVHRR/3data of every day in2010areprocessed, analyzing the data changes of twelve months and researching thesuspended sediment transport mechanism of summer half-year and winter half-year.The research area is divided into the provenance area, transportation area, depositionconvergence area and long-distance diffusion area to discuss its transport mechanisms.In the study, in March and April, there is suspended sediment collection at the edge ofthe continental shelf, which in the winter half-year suspended sediment transportdirection is closely related to the southeast waters.Studies have shown that distribution changes on high and the second highconcentration of suspended sediment concentration in the study area confirms thesediment transport model of "summer storage and winter transport " in estuary ofChina east seas again. From October to February, large amounts of sediment inresearch area export under the effect of powerful winter monsoon and circulationsystem, and this is the period of transport. From March to June, distribution of SSCis from high to low, and at the same time, diffused tendency to open seas is not obvious gradually, and this is the transition phase from transport to storage. From Julyto September, sediment outputs is at a low level and nearly remained unchanged，andthis is the period of storage.It was found that the concentration of suspended sediment is obviously highinshore and low offshore, and river mouths are generally high concentration areasfrom the distribution of suspended sediment in the twelve months of2010.Suspendedsediment transportation is driven by current system, the strength and direction of thecurrent plays an important role on distribution and transport of suspended sediment.However, the combined action of provenance, currents, the topography and weatheris the key factor of suspended sediment distribution and transport in the entirecontinental shelf waters.From the correlation between distribution of suspended sediment concentrationand sea surface temperature, in winter half-year, the correlation between suspendedsediment concentration distribution and circulation is high, and the distributionpattern presents"└" type; in summer half-year, suspended sediment concentrationdistribution and circulation have minimal relevance, and the distribution patternpresents "sprouts" shape, and most of the study area was concentrated "oval" shapedistribution.In winter half-year, the interaction of current system is obvious, which is thesignificant period for the form of vortex sediment deposition, and suspended sedimentwas transported to southeast,part of which reaching the outer continental shelf, iscaptured by Kuroshio Current,with whom reach the open sea, and part of which passthe Tokara Strait reaching the open sea. In summer half-year, coastal current becomeweak, and warm current control the distribution and transportation of suspendedsediment. Because of the upwelling block, most of the suspended sediment can notreach the edge of the continental shelf, the minority which reaching the edge of theshelf is blocked by the Kuroshio power and thermohaline, also cannot reach the opensea.When the winter and summer monsoons effect frequently, partly suspendedsediment can be directly input to the open sea by advection. So extreme weather conditions can break the routine distribution of suspended sediment.