Agus Suharyanto

MODELING OF DISCHARGE FLUCTUATION INFLUENCE ON RIVER MEANDERING GEOMETRY CHANGE

The river meander geometry change is a process in the rivers pertaining to erosion on one cliff and river bottom in one side accompanied by sedimentation in the other side, it is becomes a threat to safety of river buildings. This research aims to build a useful empirical model for analyze discharge fluctuation change influence on river meander geometry changes. This model was constructed by considering sedimentation function E = f(Q, A, hb, O, S, rc, aand tand scouring functionG = f (Q, A, hb, O, D50, rc,  aand t ). By applying this model shifting vertical meander most progressive is in a cross section in 1992 to 2011 occurring shifting deep as 7.27 metres. The most progressive horizontal meander shifting occur in other cross section, in the same period horizontally shift towards right bank of 3.15 metres. The second progressive horizontally shifting meander occurs in a cross section, occurring shifting horizontally toward the right bank of 2.67 metres. Erosion process more dominant is caused by changes in discharge fluctuations.