scholarly journals Physical modelling of semi-circular channels and low velocity zones - application to pipe culverts and upstream fish passage at less-than-design flows

2019 ◽  
Author(s):  
Hubert Chanson
Keyword(s):  
Physical Modelling ◽  
Fish Passage ◽  
Low Velocity

Compression waves reflection from the low-velocity azimuthally anisotropic medium: a physical model study

2020 ◽  
Vol 221 (2) ◽  
pp. 1320-1326
Author(s):  
YuI Kolesnikov ◽  
K V Fedin ◽  
L Ngomayezwe
Keyword(s):  
Fractured Reservoirs ◽  
Physical Modelling ◽  
Azimuthal Anisotropy ◽  
Reflection Coefficients ◽  
Low Velocity ◽  
Compression Waves ◽  
Model Study ◽  
Isotropic Media ◽  
Hti Media ◽  
High Degree

SUMMARY Interest in azimuthal anisotropy of rocks is mainly associated with fractured reservoirs, which may contain hydrocarbon deposits. Cracks in such deposits in most cases have a subvertical orientation, which is caused by the predominance of vertical stresses in rocks over horizontal ones. To determine the azimuthal direction of fractures, one can use, in particular, the dependence of the reflection coefficients of elastic waves on the boundaries with such media on the azimuth. This paper presents the results of physical modelling, demonstrating this dependence. To conduct experiments, we developed a technology for manufacturing models of azimuthally anisotropic (HTI) media with a high degree of anisotropy by 3-D printing. The features of the reflection of compression waves from the boundary of water and low-velocity azimuthally anisotropic media were experimentally investigated on the example of the model HTI medium produced by this method. Experiments have shown that at angles of incidence less than 25°, the reflection coefficients are practically independent from the azimuth. However, at larger angles of incidence, an azimuthal dependence of the reflection coefficients is observed, most pronounced at azimuths from 45° to 75°. The results of measurements in the direction of the isotropy plane agree well with the theoretical reflection coefficients for the boundary of isotropic media.

scholarly journals PHYSICAL MODELING OF THE ELASTIC WAVES REFLECTION FROM THE BOUNDARY WITH LOW-VELOCITY AZIMUTHALLY ANISOTROPIC MEDIUM

2020 ◽  
Vol 1 (1) ◽  
pp. 60-71
Author(s):  
K. V. Fedin ◽  
Yu. I. Kolesnikov ◽  
R. N. Beysembaev
Keyword(s):  
Anisotropic Medium ◽  
Elastic Waves ◽  
Physical Modelling ◽  
Reflection Coefficients ◽  
3D Printer ◽  
Azimuthal Dependence ◽  
Low Velocity ◽  
Isotropic Media ◽  
Theoretical Reflection ◽  
Good Agreement

The physical modelling of elastic waves reflected from the boundary between the water and the model of low-velocity azimuthally anisotropic medium was carried out. The model of anisotropic medium was made using 3D printer. The results of experiments showed that the reflection coefficients are practically independent from the azimuth at the angles of incidence less than 25°. At larger angles of incidence, the azimuthal dependence of the reflection coefficients is observed, which is most pronounced at azimuths from 45° to 75°. The results of measurements in the layering direction are in good agreement with the theoretical reflection coefficients for the boundary of isotropic media.

scholarly journals Hybrid modelling of low velocity zones in an asymmetrical channel with sidewall longitudinal rib to assist fish passage

2020 ◽  
Vol 36 (5) ◽  
pp. 807-818 ◽  
Author(s):  
Pedro X. Sanchez ◽  
Xinqian Leng ◽  
Johann Von Brandis‐Martini ◽  
Hubert Chanson
Keyword(s):  
Fish Passage ◽  
Low Velocity ◽  
Hybrid Modelling

Characterizing low velocity zones around a spoiler baffle for improving fish passage performance

2020 ◽  
pp. 1837-1842
Author(s):  
D. Magaju ◽  
H. Friedrich ◽  
P. Franklin ◽  
C. Baker ◽  
J. Montgomery
Keyword(s):  
Fish Passage ◽  
Low Velocity
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