| dc.description.abstract | Abstract. One of the problems that occur in Progo River is the formation of sediment in the downstream section. The sediment material in the upstream become the source of sediment supply for the downstream area. Excess sediment supply from upstream causes morphological changes in a relatively short time. The morphological changes in riverbed will be affected hydraulics conditions. Hydraulics have an important role in the process of aggradation and degradation in the riverbed. Furthermore, the process of erosion and sedimentation will affect the stability of the construction in the water. In the Progo River, there are building of infrastructure such as revetment, bridge, irigation intake, groundsill and weir. Based on the results numerical model of hydraulic analysis system, approximately 87,000,000 m3 of sediment settles on the Progo River in 2015. Aggradation and degradation have been occured very intensively in middle-downstream area of the Progo River. Sediment movement simulation also showed that the sediment supply of lava can prevent excessive bed degradation. But if there is no longer for the supply of sediment, bed degradation process will occur. This indicates that the management of the sediment supply in the upstream area must be managed properly. | en_US |
