MORPHOLOGICAL CHANGES DUE TO THE PEAK FLOW AND SEASONAL FLOW OF THE BABAME RIVER

抄録

 The hydrogeomorphic response has tremendous impact on future trend of rivers, sediment transport and bed characteristics. Analyzing the river morphological changes of extreme flow and normal flow is important for all rivers. Extreme event flows of rivers exert sustainable forces, altering the bed and banks of the rivers. The main purpose of this study is to investigate how the riverbed and banks have different effects in high and seasonal flows to understand river management. In August 2017, the Babame riverbank was hugely damaged by the high flow as the result of heavy rainfall. Moreover, its seasonal flood ensues throughout the year because of the humid climate condition. Most of the morphological studies focus on the peak flow and extreme events of the rivers, occasionally neglecting seasonal flow of rivers. Long-term seasonal flow and peak flow analyses in various parameters can explain the effects of the morphological changes. The flow rate of a river is one of the most important factors that can change river morphology and erosion process. Peak flow event is one major cause of the massive amount of bank erosion and deposition. This study applies tow-dimensional hydrodynamic models that analyze flow, sediment transport and morphological change namely Nays2DH. The stimulated results present actual phenomena of morphological changes. By applying two-dimensional model, the simulation results indicate the erosion and deposition processes affected by peak flows and seasonal flows.