Study on Riverbed Deformation and its Control in the Joganji River

Abstract

Allowable sediment discharge is the sediment discharge that does not cause hazardous aggradation and keeps riverbed elevation. Sabo plan has been considered mainly from a point of view of causing sedimentrelated disasters.
It, however, shoud be also considered from a point of view of water utilization and river environment.
In this paper, the past data of riverbed elevation change in the Joganji River was analyzed and computer simulation was carried out for about three cases; (1) the present condition, (2) with closed type sabo dams (most commonly dams), (3) with slit type sabo dams. It was made clear that slit type sabo dams are effective to maintain the present riverbed conditions.