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《Environmental Science Survey》 2017-05
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Evaluation of the Trophic State of Erlonghu Reservoir based on Hyperspectral Data

SONG Yan-yan;SU Dong-hui;SHAO Tian-tian;Collaborative Innovation Center on Yellow River Civilization of Henan Province,Henan University;  
Correlation analysis was conducted among original,normalized,first derivative of hyperspectral reflectance,and chlorophyll a concentration( Chl-a) in order to determine the most sensitive wavelength for estimation of Chl-a concentration. Band ratio was also adopted for the retrieval of Chl-a concentration. Models based on the four methods all exhibited well results. The verification model based on band ratio showed the highest accuracy with R~2= 0. 71. Moreover,models were established to estimate transparency( SDD),total phosphorus( TP),and total nitrogen( TN) based on the original hyperspectral reflectance. The results showed that all the models obtained very high precision. Combination of comprehensive nutrition state index and evaluation index of water quality parameters was used to evaluate the eutrophication status of ErlonghuReservoir. The result showed that Erlonghu Reservoir was in medium nutrient level and measures were needed to prevent the water body from deterioration.
【Fund】: 国家自然科学基金项目(41601377 41601120);; 教育部人文社会科学研究项目:15YJC790049
【CateGory Index】: X824;X87
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