This study concerns a method to install spur dikes in the Yodo River, for the purpose of bed deformation control and diversification of physical conditions around the spur dikes. The effects on the physical conditions around the installed spur dikes are evaluated, based on numerical analysis and field survey. The numerical analysis results show that, by installing spur dikes with a focus on hydraulic conditions of not forming sand bars, sediment deposition is suppressed in the main channel. The field survey results demonstrate that sediment deposition in the channel is also suppressed. By installing the spur dikes, some physical conditions around the installed spur dikes can be diversified. By installing spur dikes using large movable sandbags and changing their height after several years, it is possible to maintain the effect of the spur dike installation and diverse bed material conditions for a long period as adaptive management. (For example, by changing the height of the spur dikes 0.3 m lower, bed degradation is produced up to 0.5 m downstream of the spur dikes.) As a result, spur dike in case 8 (shape(c), height 0.7 m from average water level) is better for the present. After several years, changing the height of the spur dikes would be better.

本研究涉及一种在淀川安装丁坝的方法，目的是控制河床变形和丁坝周围物理条件的多样化。根据数值分析和现场调查，评估对已安装丁坝周围物理条件的影响。数值分析结果表明，通过在不形成沙坝的水力条件下设置丁坝，抑制了主河道内的泥沙沉积。现场调查结果表明，河道内的泥沙沉积也受到抑制。通过安装丁坝，可以使已安装丁坝周围的一些物理条件多样化。通过使用大型活动沙袋安装丁坝并在几年后改变其高度，作为适应性管理，可以长期保持丁坝安装的效果和不同的床料条件。（例如，通过将丁坝的高度降低 0.3 m，在丁坝下游 0.5 m 处产生的河床退化。）因此，案例 8 中的丁坝（形状（c），高度为 0.7 m）。平均水位）目前较好。几年后，改变丁坝的高度会更好。