Kinematic wave model modified by including infiltration and groundwater runoff and its application
2016
Nagai, A. (Okayama University, Okayama (Japan). Graduate School of Environmental and Life Science) | Chikamori, H.
In this paper, kinematic wave model was applied to simulation of rainfall-runoff processes. The kinematic wave model has been usually used for calculating overland flow from rainfall excess that is residual of total rainwater after subtracting infiltration and evapotranspiration. The developed model simulates overland and groundwater runoff from total rainfall considering infiltration. That is, the developed model simultaneously simulates overland and groundwater runoff and infiltration. The model was applied to simulation of 34 floods' discharge with peak specific discharge of 0.6-18 cubic m /s /square km in six watersheds of various sizes (10 square m - 1,717 square km) with different land cover. The results show that the developed model well simulates flood discharge for all objective floods. Simulation accuracy of channel flow of the developed model is comparable to that of a model with diffusion channel flow model in large catchments, which suggest advantage of kinematic wave channel model to diffusion model in balance between accuracy and simplicity.
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