SEDIMENT STREAM DIVISION AT RIVER BIFURCATION WITH MOVABLE BED

摘要

In this work there is presented a way to calculate water and sediment stream divisionrnat river bifurcation. The sediment stream, while sediment is described by the wholernsieve curve, is calculated by Ackers-White’s method. The calculations of flow andrnsediment stream parameters are given graphically by solving so ?called“ ?small“ andrnbig loop, separately for each river arm after the bifurcation. Introducing the boundaryrncondition of river slope equalisation at the bifurcation, i.e. when the river slopernbefore the bifurcation is equal to river slopes in both branches, allows to define thernriver depth, flow and new sieve curves down stream. The assumed calculationrnmethod was verified by the results of the field measurements, which were carried outrnduring the flood in August 1997 at the Oder River division into Western and EasternrnOder River at its estuarial section Widuchowa.