Reconstruction of river bed topography from free surface data using a direct numerical approach in one-dimensional shallow water flow

2011 ◽  
Vol 27 (2) ◽  
pp. 025001 ◽  
Author(s):  
A F Gessese ◽  
M Sellier ◽  
E Van Houten ◽  
G Smart
Keyword(s):  
Free Surface ◽  
Shallow Water ◽  
Water Flow ◽  
Numerical Approach ◽  
Shallow Water Flow ◽  
One Dimensional ◽  
Bed Topography ◽  
River Bed ◽  
Surface Data

scholarly journals ONE-DIMENSIONAL AND TWO-DIMENSIONAL CALCULATION OF SHALLOW WATER FLOW OVER SUBMERGED LARGE ROUGHNESS

2000 ◽  
Vol 44 ◽  
pp. 533-538
Author(s):  
Shoji FUKUOKA ◽  
Tatsuhiko UCHIDA ◽  
Takuji FUKUSHIMA ◽  
Masanori MIZUGUCHI
Keyword(s):  
Shallow Water ◽  
Water Flow ◽  
Two Dimensional ◽  
Shallow Water Flow ◽  
One Dimensional ◽  
Large Roughness

scholarly journals Flow structure from a horizontal cylinder coincident with a free surface in shallow water flow

2012 ◽  
Vol 16 (1) ◽  
pp. 93-107 ◽  
Author(s):  
Ali Kahraman ◽  
Muammer Özgören ◽  
Beşir Şahin
Keyword(s):  
Free Surface ◽  
Shallow Water ◽  
Water Flow ◽  
Vortex Formation ◽  
Flow Characteristics ◽  
Lower Surface ◽  
Horizontal Cylinder ◽  
Bottom Surface ◽  
Shallow Water Flow ◽  
Cylinder Diameter

Vortex formation from a horizontal cylinder coincident with a free surface of a shallow water flow having a depth of 25.4 [mm] was experimentally investigated using the PIV technique. Instantaneous and time-averaged flow patterns in the wake region of the cylinder were examined for three different cylinder diameter values under the fully developed turbulent boundary layer condition. Reynolds numbers were in the range of 1124? Re? 3374 and Froude numbers were in the range of 0.41 ? Fr ? 0.71 based on the cylinder diameter. It was found that a jet-like flow giving rise to increasing the flow entrainment between the core and wake regions depending on the cylinder diameter was formed between the lower surface of the cylinder and bottom surface of the channel. Vorticity intensity, Reynolds stress correlations and the primary recirculating bubble lengths were grown to higher values with increasing the cylinder diameter. On the other hand, in the case of the lowest level of the jet-like flow emanating from the beneath of the smallest cylinder, the variation of flow characteristics were attenuated significantly in a shorter distance. The variation of the reattachment location of the separated flow to the free-surface is a strong function of the cylinder diameter and the Froude number.

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