Kinematic Wave Model Modified by Including Infiltration and Groundwater Runoff and Its Application

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  • 浸入を考慮した表面流モデルの適応性と考察
  • シンニュウ オ コウリョ シタ ヒョウメンリュウ モデル ノ テキオウセイ ト コウサツ

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Abstract

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 m3s-1km-2 in six watersheds of various sizes (10 m2 - 1,717 km2) 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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