2002 Volume 46 Pages 265-270
The objective of this study is to improve a distributed hydrologic model using SMPT (Soil Moisture Parameter Tank) model by applying kinematic wave model to river flow routing changing time step of day to an hour. The watershed basin is divided into a grid cell of 50m. This model is composed of three structure; surfaces division, river division, and groundwater division. In surface division, evapotranspiration, infiltration, percolation, interflow, and surface outflow were computed in each cell. Kinematic wave model was applied to river flow components. Groundwater component computes the groundwater levels and the flows in the saturated zone of an unconfined aquifer, stream interactions, and groundwater seepage at the ground water surface. The model is applied to simulate water cycle in the Azuma Upper Experimental basin (1.81km2) with a time step of an hour. The model parameter is calibrated through comparison of the simulated river discharge, groundwater levels with the observed value.
