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Scour holes resulting from the installation of a groyne are considered to perform the environmental function of providing a habitat and a haven for various aquatic organisms during floods, hence, the need for studies on the scour area and its volume near a groyne beyond the scope of past discussions on their stability. In this study, hydraulic experiments were conducted in fixed and movable beds to examine the flow pattern, bed change and scour depth and hole around a groyne. The results of the fixed-bed experiment indicated an effect on the flow change in the main channels and recirculation zones following the installation of a groyne. Changes in tip velocity and flow angle as the scour factors around a groyne were quantitatively compared as well. Through the movable-bed experiment, the scour-hole shape, scour area, scour depth and volume of bed change were examined and compared.

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The viewpoint of a river is changing as people regard the river as water-friendly space where they can enjoy and share the space beyond the simple purpose of flood control alongside the improving social level. The floating islands installation was planned featuring three islands. The river’s flow and channel stability could be changed when new structures are built in a river. Hence an analysis of the hydraulic characteristic changes should need. The hydraulic model experiment in this study sought to review the impacts of the floating islands installation on the safety of flood control and stability of river channel. This study analyzed the hydraulic features affecting the surrounding stability when installing floating islands and proposed stable floating islands layout in terms of hydraulics based on the experiment results

In a river, sediment discharge, which goes through erosion, transport, and deposition by flowing water, is important data for river projects. The transport of river sediment occurs depending on the conveyance of a channel as the basin sediment discharge, which has been introduced to the river via the outflow of the basin by the erosion of fertile topsoil or ground surface due to rainfall in the target basin, and the sediment eroded within the channel is mixed together. River sediment is a major factor for river formation and ecological habitat, and is a field that is difficult to analyze or predict. For the abandoned channel restoration of the Mangyeong River, this study aimed to develop a discharge-suspended sediment load rating curve by collecting suspended load and bed material at the Bong-dong gauging station, which is a test section. The developed discharge-suspended sediment load rating curve was proposed based on the existing discharge data and the measured sediment load. The measured data and the rating curve will be used as the major data for stability and habitat restoration during channel restoration.