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Dynamical Monitor And Analysis Of Suspended Sediment Concentration By Remote Sensing In Caofeidian Offshore Areas

Posted on:2012-11-30Degree:MasterType:Thesis
Country:ChinaCandidate:J CuiFull Text:PDF
GTID:2218330335993017Subject:Cartography and Geographic Information System
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Suspended sediment concentration is one of the most important parameters in ocean water quality evaluation.However, traditional method of investigating suspended sediment is to sample and analyse by boat point by point.There are many disadvantages:the rate of this survey is slow and the cycle is long,also the coverage is small and the synchronous site is less.So it's difficult for continuous synchronized accurate monitoring of the suspended sediment concentration in large waters.Using remote sensing technology to inversion the suspended sediment concentration of water has characteristics of convenient,fast,accurate and strong periodic.At present,Remote sensing technology has become an important technical means for suspended sediment concentration inversion and dynamic analysis of inshore case II waters.According to the Suspended sediment concentration and spectral observation data of field water,this paper builds up the inversion model of suspended sediment concentration in the offshore Marine areas in caofeidian.Using the two stage MODIS remote sensing data and we get the remote sensing quantitative dynamic monitoring of the water suspended sediment concentration in offshore Marine areas.The main research work of this paper are:1) To process the suspended sediment spectra data and to calculate the remote sensing reflection of suspended sediment of all measurement sites.2) To analyse the spectral features of suspended sediment remote sensing reflection, and to calculate the correlativity between all sites suspended sediment concentration and remote sensing reflectivity of MODIS center band according to band set of MODIS sensor.To select the sensitive factor of remote sensing inversion and build up the statistics regression model between suspended sediment concentration and sensing reflectivity of all sensitive factor.By accurately assess the inversion model and get the quantitative inversion model of suspended sediment concentration in the study offshore Marine areas.3) To use the two stage MODIS remote sensing data and use the quantitative inversion model to do the suspended sediment concentration of inversion and dynamic analysis of the offshore Marine areas in caofeidian.The main results and conclusions:1) The spectral reflectance of suspended sediment water increases with suspended sediment concentration and the spectrum curve of suspended sediment water has the doublet features(550-600nm and 790-830nm).Bandl,Band2 and its combination band Bandl/Band4 are sensitive to the suspended sediment concentration,especially the Bandl/Band4,which has the highest correlation coefficient.2) Using the spectral observation datas of 2008 and 2009 to build up the statistics regression model between suspended sediment concentration and remote sensing reflection,and the results show that quadratic polynomial model of combination band Bandl/Band4 has the highest correlation coefficient,which is 0.886 and 0.976.By accurately assess the inversion model and discover that the RMSE in 2008 and 2009 is 5.6 mg/l and 5.08mg/l.3) By contrast analyse the inversion results of the two stage MODIS datas,this paper get that the sediment concentration in study areas is mainly (0-10) mg/l in 2008 while the sediment concentration is mainly (10-20) mg/l in 2009.With the expansion of port,the suspended sediment concentration in the port increases obviously from 2008 to 2009,which changes from mainly (20-30) mg/l in 2008 to more than 40mg/l in 2009.Through the above research work and the conclusion,which provides parameters for interactions the port construction and suspended sediment transport and for numerical simulation of Marine hydrodynamic environment.Also it can provide the scientific decision-making for the economic development and environmental protection in this areas.
Keywords/Search Tags:Suspended sediment concentration, CaseⅡwaters, Remote sensing inversion, MODIS, Dynamic monitoring
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