FINE SEDIMENT DEPOSITION BY FLOODS ON THE UPSTREAM OF A WEIR WITH A CHANNEL BEND
On the upstream of Atago weir, Hirose River, Japan, the sedimentation phenomenon is complex due to the coexistence of the weir and channel bend. Moreover, fine sediment accumulates on the river bed notably not only the floodplain. In this study, we conducted field observation and numerical computation. From the observation results, we found that fine sediment is the major component in the flood water and accumulates significantly close to the inner bank (silt and clay=55% in the maximum). In the numerical computation, we calculated the flow using finite volume method with unstructured grid. The suspended-sediment transport was calculated by the advection-diffusion equation considering settling and resuspension. By considering the weir and cohesivity of the fine sediment, we reproduced the settling-resuspension characteristics of the fine sediment. From this calculation result, the deposition and erosion region was indicated.
finite volume method suspended sediment grain distribution cohesivity nonequilibrium sediment transport
Yoshiyuki Shirotori Kozo Watanabe Keiko Udo Akira Mano
Graduate School of Engineering,Tohoku University, Aoba 6-6-11, Sendai, Japan Graduate School of Engineering,Tohoku University, Aoba 6-6-06, Sendai, 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
815-820
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）