Preliminary study on standard of riverway-digging effect forecasting

Three judgement standards of riverway-digging effect forecasting,ratio of reducing deposit,speed of restoring and steady gradient,are put forward directed to the importance of riverway-digging effect forecasting.They are explained according to a mathematical model result combined with Shandong reach of Yellow River.Validity and application potent ial of riverway-digging effect are analyzed by the three judgement standards.