Abstract:

By taking soil samples from field at different soil depth in different undestroyed forest soil in the Natural Preserve Region of Changbai Mountain, measuring their saturated conductivity and effective porosity, we put forward logarithmic submodels that saturated conductivity and effective porosity vary with depth. Then, substituting those submodels into Sloan's storage-discharge model, a simple modified storagedischarge model of interflow based on the balance of water and kinematic assumption was presented in this paper. The interflow processes of two rainfall events were simulated separately on a simulated hillslope of forest catchment in Forest Hydrological Modeling Laboratory of Changbai Mountain Forest Ecosystem Research Station, Chinese Academy of Sciences, and the modified model was tested and verified by comparing the hydrograph of interflow predicted by the model with measured hydrograph. The simulated hillslope used the hillslope of broad-leaved Korean pine forest in catchment of Erdaobai River as background. At the same time, we compared our model, Sloan's model and Robinson's model with the measured results simultaneously, too. The results of comparison show that our model is better than the others, especially, our model yields excellent results at simulating total volume of interflow, peak time, peak flow, and delay time.

Key words: Forest catchment, Interflow, Model, Simulation