2003 Volume 16 Issue 6 Pages 595-604
Until now, as the modeling of red soil runoff in Okinawa, the suspended sediment (SS) runoff analysis model has been developed. However, because there are not enough long term observed data about red soil runoff from upland field area in Okinawa, the characteristics of the SS runoff analysis model has not been sufficiently verified yet. So, the slope model to generate the virtual data to verify the SS runoff analysis model was developed in this study. Moreover, in order to examine whether the calculated virtual data can be used to verify the SS runoff analysis model or not, the numerical experiments were done by changing the source of SS, concentration ratio of flow in the slope or the difference of particle size. Then, the SS runoff characteristics of the virtual data were compared with these of the observed data. As the results, it was confirmed that the virtual data represent the same SS runoff characteristics as the observed data from the viewpoints of the deference of the appearance time of SSC (Suspended Sediment Concentration) peaks and the discharge peaks, the hysteresis in the relation between the discharge and the SSC, and the first flush. So, it was recognized that the virtual data can be used for the verification of the SS runoff analysis model.
