Determination The Water Quality And Evaluation The Eutrophication Of Hulun Lake With MODIS Data

HuLun lake is located in the Hulun buir grassland in Inner Mongolia, is an important part of ecological barrier in north China. In recent years,the water levels fall constantly, the lake shrinking, seriously affected the lake fishing and the surrounding ecological, the Hulun buir grassland ecological environment is deteriorating.In view of the above situation, the Hulun lake as research object in his paper, use the MODIS satellite remote sensing data to remote sensing inversion the water body water quality of Hulun lake and evaluate the eutrophication degree of lakes on time sequence. The concentration of all water quality parameters were selected with the measuring data of Hulun Lake on July2,2012and August5,2012as well as the MODIS images on the same days. The semiempirical regression model were determined and validated, and all the water quality concentration was derived with the model.The results show that the No.11, No:12bands and their ratio of MODIS images with1000m resolution ratio can be used in simulating the Chl-a concentration, the model is applied to July2, get the correlation coefficient of the estimate and the measured values of chlorophyll a is0.75.2013in the MODIS image, The No.6, No.7bands of MODIS images with500m resolution ratio can be used in simulating the TP concentration, the model is applied to July2, get the correlation coefficient of the estimate and the measureed values of TP is0.48. And the No.17, No.18, No.19, bands of MODIS images with1000m resolution ratio can be used in simulating the COD concentration, the model is applied to July2, get the correlation coefficient of the estimate and the measured values of COD is0.75. And because of the optical properties of total nitrogen is not obvious, in this study did not find the sensitive wavelengths with MODIS data.Then the eutrophication of the lake was evaluated, the results showed, Lake. Because of increased rainfall, the lake in the summer of2013in July and August, water quality is good than other month, In a state of mild eutrophication. In other,waters are moderately eutrophication level.Where individual, show severe eutrophication state. There is a trend of eutrophication, we need to pay more attention in daily monitoring.