Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Riverbed Fluctuation Analysis of Small Rivers Equipped with Stream Barb Groins
Streambed degradation significantly affects riverbanks, causing various problems such as unstable flood control. Stream barbs are therefore, used for streambank stabilization; they are low-height masonry groins placed from the riverbank to the upstream side and are intended to mitigate riverbed degradation as a form of river flow control. In this study, the effect of stream barbs installed in 2018 in the Tagawa River in Nagano Prefecture, Japan, was investigated via riverbed fluctuation analysis using International River Interface Cooperative software. A terrain model for simulation was created using a computer-aided design river section view, and a hydrograph for May to December of 2018 was calculated from the stage discharge curve (H-Q curve). The Tagawa River was assumed to have a four-stage peak flow rate (maximum of 160 m3/s), with a design discharge of 410 m3/s. The analysis confirmed that regardless of the peak discharge scale, sedimentation of soil occurs at under 30–20 m3/s corresponding to the gradual decrease curve of discharge. The fluctuation analysis results were compared with drone-captured images from January 2019, whereby the flow meandering conditions of watercourse formation, sedimentation of soil, and scouring sites were determined. Overall, the simulation results were confirmed to agree closely with the images. It was also confirmed that the new side bar generated via the barb construction is effective in maintaining the sediment and preventing the decline of the riverbank against flooding at the scale at which the sidebar was generated, although the scouring becomes deep during flooding.
Riverbed Fluctuation Analysis of Small Rivers Equipped with Stream Barb Groins
Streambed degradation significantly affects riverbanks, causing various problems such as unstable flood control. Stream barbs are therefore, used for streambank stabilization; they are low-height masonry groins placed from the riverbank to the upstream side and are intended to mitigate riverbed degradation as a form of river flow control. In this study, the effect of stream barbs installed in 2018 in the Tagawa River in Nagano Prefecture, Japan, was investigated via riverbed fluctuation analysis using International River Interface Cooperative software. A terrain model for simulation was created using a computer-aided design river section view, and a hydrograph for May to December of 2018 was calculated from the stage discharge curve (H-Q curve). The Tagawa River was assumed to have a four-stage peak flow rate (maximum of 160 m3/s), with a design discharge of 410 m3/s. The analysis confirmed that regardless of the peak discharge scale, sedimentation of soil occurs at under 30–20 m3/s corresponding to the gradual decrease curve of discharge. The fluctuation analysis results were compared with drone-captured images from January 2019, whereby the flow meandering conditions of watercourse formation, sedimentation of soil, and scouring sites were determined. Overall, the simulation results were confirmed to agree closely with the images. It was also confirmed that the new side bar generated via the barb construction is effective in maintaining the sediment and preventing the decline of the riverbank against flooding at the scale at which the sidebar was generated, although the scouring becomes deep during flooding.
Riverbed Fluctuation Analysis of Small Rivers Equipped with Stream Barb Groins
Lecture Notes in Civil Engineering
Hazarika, Hemanta (Herausgeber:in) / Madabhushi, Gopal Santana Phani (Herausgeber:in) / Yasuhara, Kazuya (Herausgeber:in) / Bergado, Dennes T. (Herausgeber:in) / Sakai, Mizuki (Autor:in) / Hashimoto, Yugo (Autor:in) / Matsushita, Eiji (Autor:in)
21.02.2021
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Construction of groins in rivers
| Engineering Index Backfile | 1921
Groins. Effect of river groins
| Engineering Index Backfile | 1928
| British Library Conference Proceedings | 1997
| Online Contents | 1996