親水利用しやすい水際部形状の成立要件の検討－砂州の形成に着目して－

抄録

Alluvial rivers differ in hydrological features based on longitudinal bed profiles, and no design has been established based on these features. This study examined waterside design requirements to promote riverfront recreational use. We selected 11 survey sites that were actively used after river improvement. Field surveys and data collection were conducted to understand the hydrological characteristics of these sites. Waterside shapes were classified into five patterns, referring to two design guidelines. One of the patterns was related to riverbed morphology, especially sandbars. In two sites, the condition allowed the formation of a point bar. The shape and position of the point bar is stable and easy to use to provide amenities. In another sites, alternative bars were formed and fixed due to the curvature of the river channel. These are considered easy to use as fixed sandbars. Based on the analysis, a waterside design flowchart was proposed, taking into account the formation of sandbars.