2012 年 68 巻 4 号 p. I_829-I_834
Several groynes were constructed about 300 years ago to protect the banks of Japanese rivers, which are characteristically steep and short. To investigate the effects of groynes on the Shigenobu River in northwestern Ehime Prefecture, a field investigation was conducted to measure the sizes of groynes and the sizes of stones on the surface of the groynes as well as the bed morphology around the groynes. In addition, particle tracking velocimetry and numerical analyses of the three-dimensional flow and bed variation around the groynes were conducted. It was found that flow patterns, such as patterns of mean velocity and Reynolds stress, and the bed variation around successive groynes were affected by the particular arrangement of groynes. The study proposes a simple arrangement of river structure for stable bed morphology.
