Numerical Study on Initial Field of Pollution in the Bohai Sea with an Adjoint Method

Table 1

The change of cost function and MAE after reversion.

Type of pollutant distribution	Cost function	Initial value of; MAE (mg/L)	Initial value of; MAE (mg/L)	Reduction ration of MAE (%)
Parabolic surface
Up direction	3.7×10^−2	0.53	0.06	88.7
Down direction	8.3×10^−2	1.52	0.20	86.9
Conical surface
Up direction	4.4×10^−2	0.98	0.11	92.5
Down direction	9.1×10^−2	1.07	0.15	92.1