Pseudo interface waves observed at the fluid/porous-medium interface. A comparison of two methods

2011 ◽  
Vol 129 (5) ◽  
pp. 2912-2922 ◽  
Author(s):  
K. N. van Dalen ◽  
G. G. Drijkoningen ◽  
D. M. J. Smeulders
Keyword(s):  
Porous Medium ◽  
Interface Waves ◽  
Medium Interface

Propagation characteristics of interface waves between a porous medium and a sediment-containing two-phase fluid

Ultrasonics ◽  
2017 ◽  
Vol 81 ◽  
pp. 73-80
Author(s):  
Qingbang Han ◽  
Lihua Qi ◽  
Minglei Shan ◽  
Cheng Yin ◽  
Xueping Jiang ◽  
...  
Keyword(s):  
Porous Medium ◽  
Propagation Characteristics ◽  
Two Phase ◽  
Interface Waves ◽  
Phase Fluid

Reflection and refraction at a fluid–porous medium interface

1992 ◽  
Vol 92 (2) ◽  
pp. 1113-1119 ◽  
Author(s):  
Giacomo Caviglia ◽  
Angelo Morro ◽  
Brian Straughan
Keyword(s):  
Porous Medium ◽  
Reflection And Refraction ◽  
Medium Interface

Reflection and transmission of waves at a fluid/porous‐medium interface

Geophysics ◽  
2002 ◽  
Vol 67 (1) ◽  
pp. 282-291 ◽  
Author(s):  
Arthur I. M. Denneman ◽  
Guy G. Drijkoningen ◽  
David M. J. Smeulders ◽  
Kees Wapenaar
Keyword(s):  
Porous Medium ◽  
P Wave ◽  
Reflection And Transmission Coefficients ◽  
Sand Layer ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Wave Velocities ◽  
Medium Interface ◽  
Water Saturated ◽  
Silt Layer

We study the wave properties at a fluid/porous‐medium interface by using newly derived closed‐form expressions for the reflection and transmission coefficients. We illustrate the usefulness of these relatively simple expressions by applying them to a water/porous‐medium interface (with open‐pore or sealed‐pore boundary conditions), where the porous medium consists of (1) a water‐saturated clay/silt layer, (2) a water‐saturated sand layer, (3) an air‐filled clay/silt layer, or (4) an air‐filled sand layer. We observe in the frequency range 5 Hz–20 kHz that the fast P‐wave and S‐wave velocities in the four porous materials are indistinguishable from the corresponding frequency‐independent ones calculated using Gassmann relations. Consequently, for these frequencies we would expect the reflection and transmission coefficients for the four water/porous‐medium interfaces to be similar to the ones for corresponding interfaces between water and effective elastic media (described by Gassmann wave velocities). This expectation is not fulfilled in the case of an interface between water and an air‐filled porous layer with open pores. A close examination of the expressions for the reflection and transmission coefficients shows that this unexpected result is because of the large density difference between water and air.

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