TY - GEN
T1 - Turbulence modeling of solute transport in open-channel flows over submerged vegetation
AU - Kang, Hyeongsik
AU - Choi, Sung Uk
PY - 2009
Y1 - 2009
N2 - A model for numerical simulations of solute transport in vegetated open-channel flows is proposed. The Reynolds-Averaged Navier-Stokes model is used for the flow analysis. For the turbulence closure, the Reynolds stress model is used, and the generalized gradient diffusive hypothesis is used to close the Reynolds-averaged advection/diffusion equation. The developed model is applied to an experimental case of solute transport in turbulent open-channel flows over submerged vegetation reported by Ghisalberti and Nepf (2005). The simulated distributions of mean concentration along the streamwise direction are compared with measured data, showing a good agreement. In addition, numerical simulations reveal that the pattern of secondary currents in vegetated open-channel flows is significantly different from that in plain open-channel flows. Using the simulated results, the vertical turbulent Schmidt number for the vegetated open-channel flow is estimated and a value of 0.58 is obtained. This value can be compared to 0.47, which was obtained by Ghisalberti and Nepf (2005) using laboratory data.
AB - A model for numerical simulations of solute transport in vegetated open-channel flows is proposed. The Reynolds-Averaged Navier-Stokes model is used for the flow analysis. For the turbulence closure, the Reynolds stress model is used, and the generalized gradient diffusive hypothesis is used to close the Reynolds-averaged advection/diffusion equation. The developed model is applied to an experimental case of solute transport in turbulent open-channel flows over submerged vegetation reported by Ghisalberti and Nepf (2005). The simulated distributions of mean concentration along the streamwise direction are compared with measured data, showing a good agreement. In addition, numerical simulations reveal that the pattern of secondary currents in vegetated open-channel flows is significantly different from that in plain open-channel flows. Using the simulated results, the vertical turbulent Schmidt number for the vegetated open-channel flow is estimated and a value of 0.58 is obtained. This value can be compared to 0.47, which was obtained by Ghisalberti and Nepf (2005) using laboratory data.
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U2 - 10.1007/978-3-540-89465-0_118
DO - 10.1007/978-3-540-89465-0_118
M3 - Conference contribution
AN - SCOPUS:84903488802
SN - 9783540894643
T3 - Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS
SP - 674
EP - 679
BT - Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS
PB - Springer Berlin Heidelberg
T2 - 16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research, APD 2008 and the 3rd IAHR International Symposium on Hydraulic Structures, ISHS 2008
Y2 - 20 October 2008 through 23 October 2008
ER -