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Accuracy of kinematic wave and diffusion wave approximations for space‐independent flows on infiltrating surfaces with lateral inflow neglected in the momentum equation
Author(s) -
Singh V. P.
Publication year - 1995
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.3360090705
Subject(s) - kinematic wave , inflow , kinematics , momentum (technical analysis) , mechanics , flow (mathematics) , dimensionless quantity , mathematics , boundary value problem , mathematical analysis , wave equation , physics , geometry , classical mechanics , surface runoff , economics , biology , ecology , finance
Error equations for the kinematic wave and diffusion wave approximations with lateral inflow neglected in the momentum equation are derived under simplified conditions for space‐independent flows. These equations specify error as a function of time in the flow hydrograph. The kinematic wave, diffusion wave and dynamic wave solutions are parameterized through a dimensionless parameter γ which is dependent on the initial conditions. This parameter reflects the effect of initial flow depth, channel‐bed slope, lateral inflow, infiltration and channel roughness when the initial condition is non‐vanishing; it reflects the effect of bed slope, channel roughness and acceleration due to gravity when the initial condition is vanishing. The error equations are found to be the Riccati equation. The structure of the error equations in the case when the momentum equation neglects lateral inflow is different from that when the lateral inflow is included.