Evaluation of the bordering methods of the absorbing boundary condition

doi:10.7523/j.issn.2095-6134.2010.2.004

Abstract

Abstract:

By taking an isotropic layered medium model with depressed characteristic as example, we analyzed the advantages of the bordering method in solving conventional boundary absorbing problems. By taking a numerical example of an isotropic tilt model, we discussed the drawbacks of the outside bordering method and the origins of the boundary absorption in detail. The generalized numerical analyses show that the outside bordering method could introduce bogus reflected waves, and the reason was that the velocity continuation on the boundary brought in man-made diffraction points. The inside bordering method is proposed for the purpose of improving numerical simulation precision, signal-to-noise ratio, and credibility at the cost of regional effective wave field. The example illustrates that the proposed method is reliable and workable.

Key words: bordering method, absorbing boundary condition, elastic wave forward numerical simulation, signal-to-noise

CLC Number:

P315.01

CHEN Ke-Yang. Evaluation of the bordering methods of the absorbing boundary condition[J]. , 2010, 27(2): 170-175.

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