黒部川の既設縦工群を活かした低水路交互砂州河道の是正に関する研究

抄録

The Kurobe river forms alternate bars at downstream of the Aimoto weir. In this section, longitudinal dikes have been installed for bank protections of the flood channel. In 1995, a large flood occurred. Meandering pattern and flow attacking points of the main channel have been changed since 1995’s flood. Therefore, most of the longitudinal dikes have become not to work against bank erosions by flood flows. In this study, we considered that improvement of channels at downstream of the Aimoto weir was accomplished by recovering natural pattern of alternate bars. And, we carried out flood flow and river bed variation analysis in gravel-bed rivers in order to investigate the stability of the predetermined channels. As a result, it was confirmed that a proposed river improvement channel was useful and the existing longitudinal dikes were able to work against flood flows.