دامنه امواج بازتابي و انتقالي در مرز لايه خاك حاوي نفت و آب

در مطالعه كنونی تأثیر لایه بندی خاك بر روی انتشار موج در یك محیط متخلخل غیراشباع توسط مخلوطی از نفت و آب در نظر گرفته شده است. نشان داده شده كه برخورد یك موج در فصل مشترك بین دو محیط متخلخل منجر به بازتاب چهار موج به محیط بالا و انكسار چهار موج به محیط پایین می گردد. از جمله ویژگی های مدل توسعه یافته توانایی آن در بررسی رفتار موج در یك محیط لایه بندی شده برای تمامی طیف فركانس است. همچنین تأثیر نحوه اتصال دو لایه نیز بر روی پایستگی انرژی موج برخوردی در نظر گرفته شده و تاثیر لغزش ایجاد شده در مرز بین دو لایه در بازتاب و انكسار موج برخوردی در مرز دو لایه دیده شده است.

In the present study the effect of soil layering on wave propagation in an unsaturated medium whose pores are filled by an immiscible mixture of oil and water is observed. It is shown that the incidence of a wave at the interface between the two porous media would cause four waves to reflect back into the upper medium and four waves to be refracted to the lower medium. Of the merits of the developed model is its ability to predict wave behavior in an unsaturated medium for the entire frequency range. The state of the bonding between the two layers is also observed on the energy conservation of the incident wave and the effect of the occurring slip is seen on the reflection and transmission of the incident wave at the interface of the two layers. Using a sensitivity analysis the effects of some important parameters such as the angle of incidence of the incident wave, water degree saturation and the effect of the bonding parameter is seen on the overall behavior of the proposed model. It is shown that for P1-wave incidence at the interface of the two layers, most of the energy is partitioned to the reflected and refracted waves. In this regard it is shown that for normal angles of incidence most of the energy is transmitted to the lower medium and for grazing angles of incidence most of it is reflected back into the upper medium. It is also observed that variations in the degree of water saturation would have a noticeable impact on the amplitude ratio of the reflected and refracted compressional and shear waves. on the other hand, variations in the bonding parameter does not have much of an impact on the amplitude ratios of the reflected and refracted compressional waves but affects that of the shear wave