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Based on the hydrodynamic background field, a Variational Assimilation (VA) Model of pollutant in the Bohai Sea is constructed. The time-varying contamination concentrations (CCs) from the pollution source (PS) are estimated using this model and a new inversion theory is proposed. Some points in the time series are selected as the independent points (IPs), while concentrations of other points are calculated through linear interpolation of these IPs. Through twin numerical experiment, all the given time-varying concentrations are successfully estimated through adjoint method. The cost function decrease greatly, and the ratio of the cost function to its initial value can even reach the magnitude of 10, indicating that the adjoint technique is computationally efficient to recover the CCs from the PS. Keywords—VA; Time-varying; IPs; CCs; Pollutant flux

Estimation of Pollutant Discharge in the Bohai Sea with Variational Assimilation Method