Errors of kinematic-wave and diffusion-wave approximations for time-independent flows |
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Authors: | V P Singh V Aravamuthan |
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Affiliation: | (1) Department of Civil and Environmental Engineering, Louisiana State University, 70803-6405 Baton Rouge, LA, USA |
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Abstract: | Time-independent (or steady-state) cases of planar (overland) flow were treated. Errors of the kinematic-wave and diffusion-wave approximations were derived for three types of boundary conditions: zero flow at the upstream end, and critical flow depth and zero depth-gradient at the downstream end. The diffusion wave approximation was found to be in excellent agreement with the dynamic wave approximation, with error in the range of 1–2% for values ofKF
0
2
( 7.5). Even for small values ofKF
2
0
(e.g.,KF
2
0
=0.75), the errors were typically in the range of 11–15%. The accuracy of the diffusion wave approximation was greatly influenced by the downstream boundary condition. The error of the kinematic wave approximation was found to vary from 7 to 13% in the regions 0.05 x 0.95 forKF
0
2
=0.75 and was greater than 30% forKF
0
2
=0.75. |
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Keywords: | Time-Independent flows planar (overland) flow diffusion wave approximation dynamic wave approximation |
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