Author(s): Pratiwi Aziz, Akihiro Kadota
Linked Author(s): Pratiwi Aziz
Keywords: Morphological changes, vegetated groynes, Shigenobu river, iRIC
Abstract:
In Japanese rivers, many groynes have been constructed to protect the riverbanks. This study focuses on clarifying the function of the existing groyne in the Shigenobu river, verify that vegetated groyne is more effective for stabilizing the flow of the river from the existing groyne and has an effect or not. In this study, field investigation is conducted located approximately 6.4 km section from Shigenobu River mouth. Survey of sand particle measurement is conducted to acquire the detailed analysis for the particle size distribution and the vegetation growth situation in the river. Based on reviews these results, analysis of the river bed variation is done by using simulation software river iRIC. The influence and flow control of the river when the water is calm, the flow rate at the time of the flood and the planning high water level is reviewed. Therefore, the vegetated groyne is believed to provide the same effect with the existing groyne when the water is calm. In addition, vegetated groyne is more effective for reducing polarization promotion of river channels as compared to the existing groyne. The higher a density of vegetation, vegetated groyne is also more effective. (2623, 65, 300)
Year: 2017