EXPERIMENTAL STUDY ON CHANGES OF BED CONFIGURATION CAUSED BY A PERMEABLE GROYNE OF STONE GABION
The permeable groyne of stone gabion is recently proposed as countermeasures for the scouring problem and also for suitable ecosystem because it keeps the stable flow and bed conditions near the groyne tip. However it should be considered that typical flow phenomena as same as impermeable groyne such as developments of large-scale vortices still occur far downstream the groyne and the phenomena might affect on the morphology of main channel. Especially in Japanese rivers, these effects will be seen due to sudden change of discharge due to heavy rainfalls so that flow around the groynes change rapidly from submerged and flow conditions. These phenomena are one of the reasons for morphological changes at the downstream of groyne. In the present study, the characteristics of bed configuration downstream of a single permeable groyne are experimentally discussed on effects of the permeability and the scales of groyne and stone gabion as well as the flow conditions such as submerged flow over the groyne. The results show that local scour around the permeable groyne is proved to be significantly small, whereas the bed configuration of the downstream region far from the groyne largely changes forming sand waves.
permeable groyne stone gabion bed configuration sand waves local scour
Hitoshi Muraoka Tutaka Fushimi Akihiro Kadota Koichi Suzuki
Dept.of Civil & Environmental Engineering, Ehime University, Matsuyama, Ehime, Japan SETOUCHI Wire Netting Industry CO.LTD, Kitagun, Kagawa, Japan Dept.of Civil & Environmental Engineering,Ehime University, Matsuyama, Ehime, Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
1072-1077
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）