Applying Hybrid Heuristic Approach to Identify Contaminant Source Information in Transient Groundwater Flow Systems

Table 2

Results of 8 scenarios for sifting the top two locations.

Scenario	Initial guess value	Sifted results
	Guess source location; (m)	First source location; (m)	Current objective function value; (×10^−5)	Second source location; (m)	Current objective function value; (×10^−5)
1	(250, 90, −3)	(110, 270, −9)	2.408	(90, 270, −9)	7.418
2	(250, 90, −21)	(110, 270, −9)	2.068	(90, 270, −9)	8.217
3	(250, 130, −3)	(90, 270, −9)	3.628	(110, 270, −9)	5.354
4	(250, 130, −21)	(110, 270, −9)	0.503	(90, 270, −9)	13.106
5	(290, 90, −3)	(90, 270, −9)	1.739	(110, 270, −9)	3.448
6	(290, 90, −21)	(110, 270, −9)	0.345	(90, 270, −9)	2.393
7	(290, 130, −3)	(110, 270, −9)	1.977	(90, 270, −9)	5.492
8	(290, 130, −21)	(90, 270, −9)	2.582	(110, 270, −9)	3.276

Note that the real source is located at (110 m, 270 m, −9 m).