Development of suspended sediment concentration (SSC) analysis model and its application with multi-objective optimization     

Kazuhito Sakai  Kazutoshi Osawa  Anshun Yoshinaga 《Paddy and Water Environment》2005,3(4):201-209

In Okinawa, red soil runoff emerged as a social problem long ago, and many control measures have been adopted. However, their effect has been gauged as insufficient. So, models to predict red soil runoff are required. Within this context, we have been developing the suspended sediment concentration (SSC) analysis model. In this study, the SSC analysis model, a lumped storage-type runoff model that includes a sediment runoff process, has been applied to two watersheds with different circumstances of land use. In the application of this model, we tried to do a multi-objective optimization and examined some policies concerning the choice of parameter sets. As a result, we were able to conclude that the SSC analysis model produced a good agreement between the calculated value and the observed value. In multi-objective optimization, the relation between the root mean square error (RMSE) of discharge and SSC became the Pareto relation. Moreover, it was recognized that, in taking into consideration the viewpoint of the RMSE of sediment load and the total sediment load error, the optimization of discharge should be regarded as important in choosing the set of parameters in an actual application.  相似文献