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Inversion Effect of Nitrogen and Phosphorus in Inland Water Under Different Application Scenarios

Total phosphorus (TP) and total nitrogen (TN) are not only important indicators of water eutrophication, but also the main parameters of water quality monitoring. Spectral water quality monitoring has become the spotlight of water environment remote sensing research because of its high speed, high efficiency and no secondary pollution. The usual inversion models of TP and TN are established based on the spectral measurement of the standard solution in the laboratory. Although this method can get good inversion results for the standard solution, the actual water quality parameters affect each other and the concentrations of TP and TN are not uniformly distributed, which makes the prediction results not ideal. In this paper, the actual water samples in study area are used as the input value of the inversion model. The influence of sample modeling in different concentration ranges on the inversion model is discussed and the prediction ability of the model to the samples beyond the modeling concentration value is determined.